do any none how muts hp this boot can handel ?

[marcomerc]

hello

I bought a new boat but i dont now what the max hp
is for this boat

maybe someone will ??

and is this a good boat ?

[marcomerc]

*

[marcomerc]

*

[heath brinkley]

there was one in town with a V6 150XP OMC hanging on it.
thats as heavy a motor as you'll find.

[Raceman]

It's hard to tell from the pictures, but the boat has definate Sidewinder or Wreigt details to it. If it's a rounded bottom V with no pad like both of those brands are you'll find it misbehaves really badly if you start layin' the power to it.

Incidentally that trailer is JUNK. It's absolutely terrible on the bottom of any boat to support it on a few rollers that way. They should be replaced with runners made from 2 by 6's or so that have decent length and bracing to support the bottom properly. If it's been on that trailer for a while it's very likely the bottom has concaves in various places.

[marcomerc]

i have now a mercury 115hp '78 inline on it
and a manule cmc power lift and 5 1/2" setback
and i run 47mhp @ 5300rmp with a alu. mercury
black max prop,the size are 12 5/8 x 21 pitch

Do you maby now of i can go higher with de hp's ?
a 150 inline ? or a v6 maby ?

The boat have a pad about 4"
the weight of the boat with out the engine is 220kg (484lbs)

thnx for the info

[thumper]

Those lines almost look like a Viper splash????????????
Anyone?

[sho305]

You can go a little faster with a bow lifting SS perf prop likely. Going to a 140/150 inline powerhead can help get more rpms, but not a huge change like a V6 would do. I'll make a wild guess the better inline powerhead and prop might get you 6Krpms with a 22-23p SS prop? SS usually 1" in pitch higher than same alum, so 20p SS = 21 alum typically. Depends on how high your bow needs to go from where it is now, though the SS prop should help some anyway due to better design and you can run the motor a little higher.

My 930lb 17' BR with no pad shows 6K rpm or very close depending on weather, with the 1500 inline having a 20p Laser SS prop. No setback, lots of trim, motor lifted 2" on transom, 55mph on new speedo and about 51-52 calculator. Same exact rpms/mph on the 21 alum Merc prop I have but can't get the bow to fly so only ~5400rpm max with that. Has lots of torque steer all trimmed up, goes airborn if you hit a wake that way. You also need a real good transom to hang a V6 on. Seems like you should be around 60mph real with a good inline and setup if that weight is right. How fast you want to go, how much do you want to spend? If not the right bottom on the boat it will not handle well at ~60+mph without changing it, nomatter what motor is on it. So it is a good thing to ask on here so you don't waste your time.

[10.5' Tunnel]

I like the blue demo prop! Stick a 2.4 on there lol

[Trikki1010]

If there is a jack plate, you better start raising that motor up until it starts lacking in water pressure, maybe block off the upper holes on the intakes. This should let it spin a little faster. 47 seems like a dog for the weight your pushing.

We really don't have enough info on the boat and the engine to work with it further.

How good of shape is the boat???

What is the transome like ???

Are there knee braces to the transome???

Any stress crack on the back or the bottom ???

If it has a pad, HP is proportionate to BALL size;) :D

[marcomerc]

Originally posted by Trikki1010
If there is a jack plate, you better start raising that motor up until it starts lacking in water pressure, maybe block off the upper holes on the intakes. This should let it spin a little faster. 47 seems like a dog for the weight your pushing.

We really don't have enough info on the boat and the engine to work with it further.

How good of shape is the boat???

the boat is in good shape

What is the transome like ???

i've put a new transom in it 2.5inch wood with epoxy
and heavy fibermat

Are there knee braces to the transome???

yes ,2inch wood with epoxy
this transome can handel a 2.5 merc i'am sure

Any stress crack on the back or the bottom ?

no there is no stress cracks on the back and bottom

If it has a pad, HP is proportionate to BALL size;) :D

what do you meen by that ?


thnx

[Dutch]

he ment you can put all the hp on it you want if you have
the balls to drive it. it will be a real hairy ride if overpowered.
good luck.

[heath brinkley]

Originally posted by heath brinkley
there was one in town with a V6 150XP OMC hanging on it.
thats as heavy a motor as you'll find.

let me clarify, THERE WAS ONE IN TOWN, not mine, don't know whose it was, or how it ran. But it had one on it with the rounded bottom like that. Never even saw it in the water but the boat was around for years with the same motor.

[Raceman]

First of all, how about posting a picture of the bottom of the boat at the center from the rear so we can see exactly what it looks like at it's deepest point.

[marcomerc]

*

[Alan Power]

Marco, at first glance I thought it was a sims super-vee but the transom is different, it also looks like a concorde. Have you got a pic from the front and of the front deck.

Does the pad finnish about 3 feet from the transom? What is the length of the boat? I think it's a concorde (UK concorde that is!) but I could be wrong.

[marcomerc]

Originally posted by Alan Power
Marco, at first glance I thought it was a sims super-vee but the transom is different, it also looks like a concorde. Have you got a pic from the front and of the front deck.

Does the pad finnish about 3 feet from the transom? What is the length of the boat? I think it's a concorde (UK concorde that is!) but I could be wrong.


Yes the pad finnish about 4feet from the back and the boat is
16.8feet long

[sho305]

I read in another thread they use that type bottom for ski racing? That pad gets up on plane faster I think. Little harder to balance for wot use.

[gaineso]

My Glasstream 15 is about 900 lbs plus gear and motor and me for probably 1800. (Fishing boat) 1986 Inline 115 turning a 22" Turbo at 4" under gives me 57 at 6200 RPM on my Garmin GPSMap76. Powertech 22" TSO at 3" under gives 59.6 at 5850 RPM. You definitely need a new prop, try a 22" stainless, and that should get you closer to 55 MPH.

[Ryan140]

hey man cool boat! the bottom looks similiar to a vmate I used to have. Mine was a good bit lighter though. I had a mid 80s 115. My boat seemed to really like a merc laser 2 prop. I turned a 26 but you wont be able to. I didnt see a gas tank when you showed a pic of your transom. If you have a tank in your bow it will really hurt top speed. If your not in love with the windshield you might stand to pick up a little bit there too. I picked up 2 or 3 mph when I took mine of my checkmate. Oh and should you start knocking on 60mph's door I would strongly recomend dual cable steering!

[marcomerc]

thnx for the great answers!

great forum!

can i put a 175hp or a 200hp on it saftly ?
Or better not ?

i want to go about mid 70s or so

the speed is the same with 1 or 2 or 3 people in the boot
he's not going harder or slower than 47mph@5400 :mad:

[Doubledog]

Where are you located?

[marcomerc]

I live in the netherlands (holland)
my englis is not very good:rolleyes:

[Doubledog]

Didn't say anything about your speaking brother. ;) Reason I was asking is because I've seen similar registration numbers before. Nice boat and it looks like a lot of fun.:)

[gaineso]

Marco, we all figured you were either from somewhere in Europe. Or New Jersey. Don't think I ever said "Welcome Aboard". We do have several other members from Europe.

[marcomerc]

Nice boat and it looks like a lot of fun.:) [/B]


not really it not going fast !:D

[gaineso]

Just a little "Tweaking" and it will. Take it slow and easy.

[baja200merk]

jack that thing uppp!!!!;)

keivn:D

[marcomerc]

i have search this forum and i found out that the boat i have is an Piranha espade 16ft pad v race boat

howmany hp the boat can handel ?? i dont now

:mad:

[Alan Power]

Glad you got it figured!

I should have guessed it though, as Gerben here on S&F has one, he is also Dutch. Maybe you could try and get in touch with him, he has a v4 OMC on his.

At over 16' I'd say it would hold a v6, an xr2 maybe! Then if you still want more you know the boat will handle the weight, then get a 2.4/2.5:)

Alan

[marcomerc]

Originally posted by Alan Power

At over 16' I'd say it would hold a v6, an xr2 maybe! Then if you still want more you know the boat will handle the weight, then get a 2.4/2.5:)

Alan [/B]

do you meen of the boat will float laying still with a v6 on his *ss ?

[gaineso]

Sit on the cowling of your current motor. If it'll still float then it will obviously take more weight. It will be more susceptible to getting swamped by backwash when slowing down. You might have to slow down carefully to avoid that. Other than that, if it's structurally sound it should be okay. I think you should see about getting the most out of the motor you've got now though.

[Alan Power]

I meant it in a few ways, the extra weight may start to crack your transom. But I noticed you have some big knees in there so you should be ok.

I dont see floating too low to be a problem, as some people put a v6 on a hydrostream viper and your boat looks to have a lot more volume in the rear than a viper.

I agree with Gaineso, some setup could get you more speed.
How fast do you want to go? :)

[97 TWISTER]

I'm with Gaineso if you can sit on the motor and it still floats it will handle a V-6 but slowing down could be tricky. I don't believe that there is any such thing as to much HP you don't have use it all but it is nice to have it there. The pad does look a little small so it could be tricky balance at speeds but you could modify it. Make sure you install a good steering system and a kill switch. Cool boat good luck and have fun Jerry

[bigboy]

I think this is a piranha espada(4m80or 16F)? Isn't it? It's made in Belgium in Antwerp. If it is a espada you can hang max 150hp on it. If it's a piranha bagheera(4m20 or 14 F) you can hang max 90hp on it. But I know somebody with a espada and he got an 140HP on it and it goes around 65MPH. It's better to take a low motor like a 140hp V4. And not a high motor for the gravity point. A piranha is very low so you have a low gravity point. So if you can take a low motor and that will be more stable. Glenn

edit: dont hang a XR2 or something on it. That would be a bit stupid believe me!

[Six Four]

looks like the tahiti I have other than your bottom if flat and mine is rounded, i put a 83 150 blk max on mine and it will run 57mph until it starts chine walking and i slow it down, I cant run full trottle or trim it at all. it hold the motor well and jumps out of the water, it thought about doing some work on the bottom to make it have a pad, it chine walks so bad it would throw you out if you run full.

[marcomerc]

edit: dont hang a XR2 or something on it. That would be a bit stupid believe me!

why not ?

[Alan Power]

Exactly what I was thinking...

I think Bigboy is trying to tell you that it could be dangerous to exceed the boats recomended horsepower rating. :eek:

Although if you check out his only other post he comends wingnut on his efforts. :confused: :D

You said you get a max speed of 47mph regardless of load, that leads me to believe there is more speed there. try a stainless prop, maybe a 23/24 chopper and raise the engine untill water pressure drops. A water pressure guage might be a good idea too.

What have you tried with set up since your last post? Have you installed a jackplate?

Alan

[marcomerc]

Yes i have a man. cmc powerlift ,the speeds only going
slower,the water press. still the same

I think that i make a pad on the boat or buy a other boat

this engine and/or boat can not handel my :D

i want to go a speed of 80mhp ,or i need a
200 or 225hp engine and maby a other boat??

the max speed i have get is 48mhp on gps
with mutch chinewalk

i thinking of buying dual steering and a 200hp merc.
and making a 10" pad on the boat (or is this to much)

i can making up from the post that 150hp is the max
on my boat ,can i hang a v6 200hp on it or more ?

i have sitting on the engine in the water,he floats !!
with no problems !!

[Alan Power]

more speed you want from that hull. It is possible to build a pad on your boat but I think if you want to go realy fast you might want to considder another hull. Thats why I bought my hydrostream from the states, there just isn't to many boats around here that will run those speeds without major work.

Maybe a phantom or a marshan or something? But I prefere the style of lake type boats.

[marcomerc]

i have consider to buy a boat from the stats only
i dont now how

what to do whit shipping and how ships from the stats to holland
and the cost :confused:

must i go to the stats or not ?

[bigboy]

Hey, maybe you could better buy a Bernico look at bernico (http://www.bernico.be) ! These boats are very fast but also very stable you can cross big waves at top speed. I think a vector must be very careful with waves. I know somebody with a piranha espada and a 140 V4 on it! I guess It runs 70MPH.

[bigboy]

Originally posted by marcomerc
i have consider to buy a boat from the stats only
i dont now how

what to do whit shipping and how ships from the stats to holland
and the cost :confused:

must i go to the stats or not ?

Shipping can cost a lot off money i think about 1500€! And you never know what you buy because you've never seen the object before! Be careful with that! If you buy something from the wrong person you can be cheated. If i were you i would search a Phantom or a bernico or a ring! I know somebody with a ring 18 foot and an xr2 on it! Here in our club there are 2 persons with it! But with a bernico you can take beter turns(bochten?)!

here a picture of the Bernico off my dad's uncle! A few years ago he was champion of Europe with waterskiing
http://www.geocities.com/teammagic71/IMG_1655.JPG

[Alan Power]

There are other things to be considdered also, mainly the recreational craft directive / RCD, if you are a member country of the EU any boat imported from outside the EU must be of a certain standard and comply to regulations and have a certificate issued and a new hull number.
This is the most important thing to research before you think about buying from outside the EU.

As for shipping cost being expensive at €1500, I paid a lot more than that for mine, but I shipped my boat inside a container for security. I don't know the cost of boats in your area but they are VERY expensive here in Ireland and I about broke even buying in the US, as I would have buying a boat in similar condition here.

If you boat out in the sea don't buy a hydrostream or anything like that, you would be better buying a Ring, Phantom, Bernico or whetever! But I dont think you will be boating in rough water with your Piranha anyway.

You need to decide what you want from your boat before you choose one.

I did not go to the states to look at my boat before I bought it, I bought my boat as a project which I knew needed a lot of work before I had a realy good boat. As it turned out the boat was in good condition so I used it for the summer.

Alan

[marcomerc]

Originally posted by bigboy
Hey, maybe you could better buy a Bernico look at bernico (http://www.bernico.be) ! These boats are very fast but also very stable you can cross big waves at top speed. I think a vector must be very careful with waves. I know somebody with a piranha espada and a 140 V4 on it! I guess It runs 70MPH.

the 140 v4 engine ,was that a propshaft raterd or crankshaft ?

The same as the inline's merc. ?

[Rickracer]

...you could expect to get into the 70s with some mods and hull work, mid 60s basically stock. With more setup and a better prop, you should be able to see mid to high 50s with your current inline motor. I don't know if going to a Merc V-6 would be a good idea for your first boat, especially one with no pad. 80s would be possible, but it might be un-drivable at those speeds without some hull work. I'd find a V-4 OMC, get it into the 70s and then decide if you want to mod the hull and go with a bigger motor, or look for another hull. :cool:

[bigboy]

hey, i can't say witch craft it is but its a 140 V4 EVINRUDE! The color is gray/ blue or something like that! But i know that there are many motors ot them! And they were build for boats like piranha and other low racerboats! As far as i think will this motor be the best on your boat! But if i where you i would certainly look at your transom! Eventually you can make it a little bit stronger! And a bit weight in the nose of your piranha can also be good! But i heard that somebody had a piranha but the bagheera thats about 14Foot with a 150 merc on it! And it wasn't safe! And where do you boat? (Oosterschelde, Veerse meer, Westerschelde?)

[marcomerc]

i drive my boat on the harinxma kanaal :D (tussen leeuwarden en harlingen en ijselmeer)

i have a pic. from a site here in the nederlands
its also a piranha espade with a merc. blackmax 175hp:D

[marcomerc]

Originally posted by Rickracer
...you could expect to get into the 70s with some mods and hull work, mid 60s basically stock. With more setup and a better prop, you should be able to see mid to high 50s with your current inline motor. I don't know if going to a Merc V-6 would be a good idea for your first boat, especially one with no pad. 80s would be possible, but it might be un-drivable at those speeds without some hull work. I'd find a V-4 OMC, get it into the 70s and then decide if you want to mod the hull and go with a bigger motor, or look for another hull. :cool:

whate do you mean by some mods and hull work ?
adding a pad en dual steering ? or more ?

this is not my 1st boat i have a fishingboot with a 20hp merc.:D

@bigboy : why was it not safe ? chinewalking or so ?

[bigboy]

Chinewalking! But here's my opinion, if i were you i would look for a big moter xr2 or something.. And hang this on her! Make a good transom plate and make it stong! If you are going to test and it chinewalks to much you can put Trim flaps on it... With this the boat wont chinewalk a lot. But you will loose a bit op speed but nog very much...! And than when you think again it's to dangerous... you buy a Vector or something from the UK without engine and you hang that xr2 on it... And you put the 115Merc again on the piranha and than you sell it...! What do you think of my opinion? Good luck with your piranha, it are very good boats! Believe me, but i like the piranha miura the most !
:D

[Propster]

From this pic of the the bottom of the first page of this thread, it appears that the hull has a pad. Might just need some additional hp, a good prop and a jackplate to get some serious speed.

To start, raise the engine a notch and get a better prop to see if that helps. You will need a water pressure guage if you raise the engine to make sure you don't loose pressure. That is only a 115, however, you might be able to get 52- 55 mph with that hull and motor. What rpm are you seeing at top speed? Is it over 5500 rpm? Might need a bigger prop.

If you had 150 hp or more with a good prop and jackplate, should be able to get over 70 mph.

[Alan Power]

I am prety sure that you will not find a vector for sale in the UK, I searched high, low and in between for a hydrostream in the UK and Ireland. There are NONE!

[marcomerc]

Originally posted by Propster
From this pic of the the bottom of the first page of this thread, it appears that the hull has a pad. Might just need some additional hp, a good prop and a jackplate to get some serious speed.

To start, raise the engine a notch and get a better prop to see if that helps. You will need a water pressure guage if you raise the engine to make sure you don't loose pressure. That is only a 115, however, you might be able to get 52- 55 mph with that hull and motor. What rpm are you seeing at top speed? Is it over 5500 rpm? Might need a bigger prop.

If you had 150 hp or more with a good prop and jackplate, should be able to get over 70 mph.

over 70mph with this hull ? with no mods (resize pad) ?
my max rmp is 48mph@5400rpm with a lot of trim
and then goes to chine walk (no dual steering and sollid mounts)
by 5100rmp no chine and a speed of 46mph (not much trim)

[marcomerc]

Originally posted by Alan Power
I am prety sure that you will not find a vector for sale in the UK, I searched high, low and in between for a hydrostream in the UK and Ireland. There are NONE!


The same here in holland, thats really sh*t :mad:

[marcomerc]

Originally posted by bigboy
Chinewalking! But here's my opinion, if i were you i would look for a big moter xr2 or something.. And hang this on her! Make a good transom plate and make it stong! If you are going to test and it chinewalks to much you can put Trim flaps on it... With this the boat wont chinewalk a lot. But you will loose a bit op speed but nog very much...! And than when you think again it's to dangerous... you buy a Vector or something from the UK without engine and you hang that xr2 on it... And you put the 115Merc again on the piranha and than you sell it...! What do you think of my opinion? Good luck with your piranha, it are very good boats! Believe me, but i like the piranha miura the most !
:D

i am looking for a xr2 and hang it on her ,we will see wat hapents
i am here in a bad weather lots of rayn :mad:

[Propster]

Looks to me like the pad (flat spot on the bottom of the hull) is wide enough for high speeds. Looks like it is at least 4" wide. I don't think the Allisons pad is any wder than that. The Allison hull is one of the fastest v-hulls in the states. Allison guys, chime in here. My boat is a catamaran (I have training wheels).

Once you are able to get enough speed to get on the pad, you will need dual cable steering and possibly solid mounts for control to keep it going straight and up on the pad.

[marcomerc]

Originally posted by Propster
Looks to me like the pad (flat spot on the bottom of the hull) is wide enough for high speeds. Looks like it is at least 4" wide. I don't think the Allisons pad is any wder than that. The Allison hull is one of the fastest v-hulls in the states. Allison guys, chime in here. My boat is a catamaran (I have training wheels)

Yes the pad is 4" wide and 3feet long
The pad and transom is that all about as the boat is
on the pad ?

[marcomerc]

Once you are able to get enough speed to get on the pad, you will need dual cable steering and possibly solid mounts for control to keep it going straight and up on the pad.

I have a littel puch in the back as i hit te trim the way up
(the boat comes out of the water)
the rmp goes from 4900 to 5400 then chinewalks
is this going up the pad ?

[Ryan140]

Not to start an argument but a 4" pad isnt very wide. The pad on my vector is 6"- 8" I believe. The pad on my allison is wider than that. I can measure both boats on Saturday if you like but I know its a good bit wider than 4".

[Propster]

No, you are not on the pad. You are just overtrimming it and riding on the back of the pad. Your best speed will come from raising the engine and trim level to slightly positive untill you can balance on the pad. If you still have to add positive trim to get the hull up and flying, you might have to add setback (space the engine farther back) to get top speed. A heavier engine will do the same thing as adding setback.

Do some searches on setback, prop centerline, hull balance and pads.

[marcomerc]

horse power ! :D

i have now a 2.4 brigeport build 1990
and a 24pitch chopper
it turn 6900rmp @ 62.5mhp ,its not good i think

propshaft is the same with the pad w/ low water pickup

gearcase is 1:87 ,perv. owner has put a anoter ecu on it
maby he is connect it not good ? motor run fine
air temp. sender in horn is not connect and no tpi on horn

[bigboy]

horse power ! :D

i have now a 2.4 brigeport build 1990
and a 24pitch chopper
it turn 6900rmp @ 62.5mhp ,its not good i think

propshaft is the same with the pad w/ low water pickup

gearcase is 1:2 ,perv. owner has put a anoter ecu on it
maby he is connect it not good ? motor run fine
air temp. sender in horn is not connect and no tpi on horn

is the motor mounted as high as possible on the transom? Do you use a bracket?

[marcomerc]

is the motor mounted as high as possible on the transom? Do you use a bracket?


yes i have a cmc hydro powerlift
it have a 5 1/2 setback bow is very low

[bigboy]

yes i have a cmc hydro powerlift
it have a 5 1/2 setback bow is very low

already Tried to put the engine higher than now?

[marcomerc]

already Tried to put the engine higher than now?


No i can't go any higher..

whate prop is "normal" for a 2.4 240hp ?

my old 115hp 6 inline had a 21pitch @ 5400rmp @ 45mph

has this engine full power ? or do i need to check ecu e.d ?

[bigboy]

No i can't go any higher..

whate prop is "normal" for a 2.4 240hp ?

my old 115hp 6 inline had a 21pitch @ 5400rmp @ 45mph

has this engine full power ? or do i need to check ecu e.d ?

I can't help you further, hope that other people can give more explanation! You make a lot off rmp so... I don't think there's so much left over.

[JustMercMe]

I'd say start with a 24 or a 26.....just keep a watch on your RPM's on props lower than 24 pitch. Really all depends on what your looking to do. All around running (sking) or Top Speed?

[bigboy]

Maybe you would better take a picture off the boat! And also one when you're running at top speed! Than you can see how the boat is handling and lays in the wather! Or you can also install a low wather pick up!

[marcomerc]

Maybe you would better take a picture off the boat! And also one when you're running at top speed! Than you can see how the boat is handling and lays in the wather! Or you can also install a low wather pick up!

i have already a low water pick up

this pic. is when i am at wot

[Rickracer]

There are a bunch of different brands and types here: http://rickracers.com/index.php?cPath=50 . If you can't find it there, it probably isn't made. A jackplate will allow greater engine height, and will also allow more bowlift with less trim. I would suggest a 5.5" or 6" either manual or hydraulic. Once you get the jackplate installed, you may need to go up in pitch on your prop. I would suggest getting the jackplate first, then try some different props. Let us know how we can help. :cool:

[marcomerc]

i have already a cmc hydro jackplate 5 1/2 "

or maby need i some spacers ?

[baja200merk]

you definatally need another 5 inches of setback!

kevin

[marcomerc]

you definatally need another 5 inches of setback!

kevin


yes its have a pad not very big aboute 4" or so

[bigboy]

yes its have a pad not very big aboute 4" or so

I think that a bigger pad would be better! How does the boat handle? At the picture your bow is very low! You have to trim it up until the nose come's a bit above. Ow do you have msn? I'm from Belgium so it woul be cool to talk about boats! Here's mine: [email protected]

[Rickracer]

http://rickracers.com/product_info.php?cPath=50_120&products_id=36

http://rickracers.com/product_info.php?cPath=50_120&products_id=133

http://rickracers.com/product_info.php?cPath=50_120&products_id=2662

The above link are for 8" manual jackplates. You might want to look into one of those, but there are other problems here if you already have 5.5" of setback. Is there any roostertail at WOT and full trim? There must be a lot of weight up front somehow. Is the fuel tank up front? Is your trim working? I'd suggest moving any moveable weight to the rear as much as possible, including your battery, the fuel tank, anchors and gear. If your pad is only 4 " wide, you may need some bottom work to get the most out of your hull, but you should at least be able to get the nose up till the water breaks right under your seat. This will most likely require a movement of the CG (center of gravity) by whatever means will work, either shifting weight inside the boat, or more setback. Let us know some more details about your setup. :cool:

[dlivewyer]

Looking at the pic of you running......you may need to try another prop.....one that has more bow lift. If I am right, and correct someone if I'm not, the chopper is designed for stern lift. If you can get one....you could try a Merc trophy plus....about a 25-26p. this is a 4 blade high performance prop that has great bow lift and is a semi-surfacing prop. You can still run your motor high and it WOULD pick up the bow of that boat. Also, the 4 blades would add stability and handling, and cut down on some of that chinwalk. Also look at the Tempest....it is a good bow lifting, semi-surfacing, high-performance prop.

Here is a link to info on the props. props (http://www.mercurymarine.com/props)

How much weight do you have in the bow?

[marcomerc]

The above link are for 8" manual jackplates. You might want to look into one of those, but there are other problems here if you already have 5.5" of setback. Is there any roostertail at WOT and full trim? There must be a lot of weight up front somehow. Is the fuel tank up front? Is your trim working? I'd suggest moving any moveable weight to the rear as much as possible, including your battery, the fuel tank, anchors and gear. If your pad is only 4 " wide, you may need some bottom work to get the most out of your hull, but you should at least be able to get the nose up till the water breaks right under your seat. This will most likely require a movement of the CG (center of gravity) by whatever means will work, either shifting weight inside the boat, or more setback. Let us know some more details about your setup. :cool:

i have 70lbs of weight up front, battery and feul tank (26gallon) is already in the back
the trim was not working at the time of the pic.
Yes there is a roostertail at wot with No trim ,propshaft same as pad

my setup :

Mercury brigeport 2.4 240hp w/ low water pickup
piranha espade 16foot 500lbs ex. motor and gear
5.5" setback cmc hydro. powerlift
chopper small ear 24 pitch gearcase 1:1.87
battery and feul tank in the back
cdi racing ecu with a a-48 chip
topspeed 62.5 (gps) @ 6800rmp

Trim is working now but not testing have d'n

thnx

[marcomerc]

How much weight do you have in the bow?

about 70lbs in the bow

[Rickracer]

If your max speed comes at more than a couple of degrees of positive trim, try removing the 70 lbs. from the bow. If your roostertail is higher than the top of the cowl, same thing. I have a strong feeling speed will come way up with the trim working. :cool:

BTW, choppers do have bowlift. Cleavers have stern lift.

[marcomerc]

roostertail is above my cowl

[Tahiti_Tim]

16ft. boat + 5.5" setback + 240 HP --> 62 MPH? Something is amiss. I've seen stern-drives (i.e., very deep running drive & heavy Chevy 350) with 260 HP run 60 MPH in a 21 ft. boat @ 2500 lbs.

1) The bow seems like it's plowing way too much water.
2) Based on 6800 rpm, 1.87, 24", 63 MPH --> slip = 23%, I feel that is too high.

I'm not sure what the WOT RPM for your motor is, but I'm guessing your not too far away from it (and based on your % slip numbers). You need less slip (which should, with your chopper prop lift that bow). So you either have too little or negative (usually bow plowing) or too much (high rooster) trim. These are at opposite sides of the trim spectrum and you seem to have both.

So now the culprit seems to be a motor that is too high. I would try lowering your motor. What is the current height at?

--Tim

[Rickracer]

Based on 6800 rpm, 1.87, 24", 63 MPH --> slip = 23%, I feel that is too high.
I believe he said 2:1 gears, and a Bridgeport should be good for 7200~7400 anyway. :cool:

[marcomerc]

Trim is working now

I have no numbers but i have a ticket from the cops
a 300dollar for to hard driving my boat :mad:

[Rickracer]

Any pics from the side, so we can see the ride attitude? :cool:

[baja200merk]

when your running your boat after you get on plane does the bow drop? i remember on my baja i would be running and once i hit 50mph the bow would drop and i wouldnt be able to go any faster... if so be shure your engine isnt too high on your transom or jackplate...

[Rickracer]

....easy fix. :cool:

[marcomerc]

i have a hook in the hull at about 1/2" at the back

i plan to make a pad on it ,is a 8" wide pad good enough for the boat ?

at 40mph the bow comes richt up as i hit the trim but as i give more trottel
the bow comes down

the gps give 63mph with 2 or 4 people in the boat?!?!?

i flip the boat next week and adding a pad or someting?!

[Alan Power]

I think this is a piranha espada(4m80or 16F)? Isn't it? It's made in Belgium in Antwerp. If it is a espada you can hang max 150hp on it. If it's a piranha bagheera(4m20 or 14 F) you can hang max 90hp on it. But I know somebody with a espada and he got an 140HP on it and it goes around 65MPH. It's better to take a low motor like a 140hp V4. And not a high motor for the gravity point. A piranha is very low so you have a low gravity point. So if you can take a low motor and that will be more stable. Glenn

edit: dont hang a XR2 or something on it. That would be a bit stupid believe me!


Chinewalking! But here's my opinion, if i were you i would look for a big moter xr2 or something.. And hang this on her! Make a good transom plate and make it stong! If you are going to test and it chinewalks to much you can put Trim flaps on it... With this the boat wont chinewalk a lot. But you will loose a bit op speed but nog very much...! And than when you think again it's to dangerous... you buy a Vector or something from the UK without engine and you hang that xr2 on it... And you put the 115Merc again on the piranha and than you sell it...! What do you think of my opinion? Good luck with your piranha, it are very good boats! Believe me, but i like the piranha miura the most !
:D

:confused:



Hey Marco, here ya go... http://www.boatsandoutboards.co.uk/view/F71562/
;)

Alan

[Alan Power]

I would advise you to do some research first before you go and build a pad on your boat!
How heavy is your boat, what kind of speeds are you expecting from it? Then decide on a suitable pad width...

I also bet if you ask Jim Russell (Jimboat) nicely he would calculate pad dimensions for you based on your boats numbers. ;)

[marcomerc]

i want to go so fast possibel :D

the boat wieght are 900lbs including engine,feul,people and gear

[Alan Power]

Are you sure?

Engine ... 400 lbs
Rigging ... 100 lbs
Fuel (asuming 22l) ... 40 lbs
2 People ... 300 lbs
Boat ... 60 lbs :eek:

Should be fast :D
This is what I mean, stop guessing! http://www.aeromarineresearch.com/quicklift.html

http://www.aeromarineresearch.com/tbdp6.html

[150aintenuff]

drop the engine down about 1/2 inch or 3/4 and re run.. choppers are major bow lifters but dont like to go up nearly as high as some modern propellers do so just drop it down 1/2 and see what happens.. it looks better but still to much boat in the water.. should be up about on the last 1/2 or 1/4 of the boat and just on the pad or slightly more and roost should be about cowl high and fairly long and flat once running out in flat water.. also when you go in to argue the point just because the cops boats cant keep up with ya and doesnt run like yours does does not mean you are over driving the boat you arte just driving it the way it should be drivin... trimmed and set up properly...

[marcomerc]

i want to go so fast possibel :D

the boat wieght are 900lbs including engine,feul,people and gear


1900lbs i meant :D

[Tampa Cat]

Are you going to remove the hook when you change the pad?Does the boat have stringers?If the boat has stringers and the hook is half way up the boat it sounds like the stringers are bowed from sitting on the trailer and possible wood rot.If that is the case I would think about taking them out.Then run screws though the bottom from the inside into some VERY stiff wood(railroad ties or what ever you have that is STRAIT) to make the bottom as strait as you can get it.Then put the stringers back in.Then remove the VERY stiff wood from the outside bottom of the boat.If your hook is small and the stringers are solid you my not need to do all this.Just flip the boat and start filling in the hook.Your pictures show a LOT of hook.The hook has got to go!I think you may run 80 with the hook gone and no pad change.Dualsteering,kill switch?

[Jimboat]

marcomerc - check your mail for my response to your PM.

As I mentioned in my response to your questions, and as Tampa Cat has also pointed out (above), if your bottom has any amount of "hook" in it (in either the pad or vee sections) this will cause "bow-down" attitude, and additional drag. Although some hulls are actually designed with a "hook" in the bottom, it's not usually desireable - and will ALWAYS be somewhat slower than a straight, flat bottom. I am not a fan of "hook" or "rocker" in hull designs at all. I would get the existing design bottom reconditioned properly and re-test, before you change your pad design. It seems that you may have some testing to do with better engine height, setback and trim angles.

[marcomerc]

the boat is upside down :)

het pad is 10" wide and 6' long :cool:

I remove also the hook in the hull

i hope that the speed go up, 63mph isn't much for a 240hp :(

[Rickracer]

...with perhaps a slight decrease in rough water ride quality. :cool: