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04-02-2020, 09:28 AM #915000 RPM
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Instigator liked this post
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04-02-2020, 09:40 AM #92
I understand completely. I have moved back into my barn/shop just in time. We converted my old billiards room into our bedroom as before the 1 bedroom was a loft and I am soon going to fear stairs. That means I can justify building me a new billiards room which has given me plenty to do. Hope you are doing well.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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Seanj85, Instigator liked this post
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04-02-2020, 12:49 PM #935000 RPM
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04-03-2020, 07:28 AM #94
A mercury switch kills motor if over trimmed. It takes ignition to ground. Motor will run fine without it.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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Seanj85 thanked for this postInstigator liked this post
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04-03-2020, 09:33 AM #95
You’re probably right on weight distribution.
Your motor is 30 - 50 lbs heavier (do we know height?) than what it was designed for.
If even w/the intended power on it, it would float low enough at rest, w/you in the back cranking on motor, to easily take water over transom/combings and sink the boat if not careful.
Add the weight of your motor to that equation...
So we have a race boat design being converted for recreational use so what concessions must be made?
Your hull is a 3 point hydro. By design, the nose catches, traps and compresses air which causes lift.
As speed increases so does lift.
You control the amount of lift by crawling fore and aft on floorboard.
When sufficient lift is created, it will lift and carry the sponsons off the water thereby eliminating the drag of the sponsons and the boat only riding on 3 or 4” of the main bottom.
This is what makes the 3 point, the fastest hull design in the world.
Where you carry your gas will have a huge effect on this.
If you put it forward of dash as I have done before, it will ruin how the boat runs.
If you put the gas tank in the cockpit, it will limit your movement and ability to “trim/control angle of attack”.
Fuel placement will likely determine if you end up w/a way cool, 55 mph toy or a 70 mph rocket.
Clear as mud?
Assuming you’ve never driven one before......, you’re not ready for 70 anyhow ��
Is the motor going to be electric or pull start?
Electric requiring more weight and it’s placement.
Way cool project either way.Last edited by Instigator; 04-03-2020 at 09:40 AM.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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04-03-2020, 01:44 PM #965000 RPM
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I've driven hydrostreams with padded bottoms but no, I have never driven a hydroplane before. I'm sure it will be a learning experience.
Motor weight is about 150 all said and done. I think the boat was originally designed to run the mark 55h which is about 100 lbs.
Clarkcraft plans call for up to 60hp so im guessing heavier then 100lbs is okay; however I dont know what 60hp weighed way back when these plans were drawn. We beefed up transom and supports in that area regardless. Clarkcraft also advertised the boat as being able to run 2 people, so I am hoping that we could offset that 2nd person with a heavier motor? I dont know.
Gas tank: I have a 3 gallon portable and a 6 gallon portable both will fit inside cockpit.
Motor will be electric start. I have a small marine battery i used on a yamaha 25 I acquired, and it cranks the 70. I dont know what it is called but it's about half the size of a 24 series battery. I was planning on mounting it right in front of the transom. If weight winds up being a big issue I can delete it and run a rope. If it is still too heavy, I will try and keep an eye out for a lighter motor. I would after all like to get the kids out on the water when this quarantine is all said and done. That is what it's all about.
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04-03-2020, 08:42 PM #97
If that motor is 150 lbs that is not good.
Plus battery....
Two people........, ugh, no.Last edited by Instigator; 04-03-2020 at 08:46 PM.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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04-03-2020, 09:18 PM #98Supporting Member
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I had a class D hydro that I mounted the battery up front (just under the steering) and it really helped with weight offset when the boat was at rest. If I was to do it again, I would have it on an alum. slide rail so that I could move it back when I moved back.
Joe
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Instigator liked this post
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04-04-2020, 06:20 AM #99
Take it to the ramp for a test float and move weight around and see where it ends up.
That hull may be big enough to absorb more weight than I think.
See if you can get in the back of the boat, to the motor, w/o taking in water.
Electric start will negate some of that need but if you have motor issues, while out, it would suck not being able to get to motor.I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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Seanj85 liked this post
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04-24-2020, 07:06 PM #1005000 RPM
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Just about ready for sea trial. I put my big boat in this week and literally lbew up one of the motors on my way to the dock slip. So I have been dealing with that (1996 merc 225 efis).
New York State is shut down, so no hull ID # which means no registration, which means no insurance and no driving... however I found a way to sea trial, not going to get into it.
Took a little time to figure out steering, I had it looped all weird and the steering bar was also a little long. Rigged the steering cable 3 times and finally got it right.
Got the old motor rigged up and running like a sewing machine. The lower carb seemed to like 2 turns out and the upper liked 1 1/2. Hope everyone is well.
Motor running:
https://youtu.be/zRif9I29MD8
Pics:
Last edited by Seanj85; 04-24-2020 at 07:24 PM.
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04-24-2020, 09:12 PM #101
Sounds good Sean.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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05-13-2020, 02:37 PM #1025000 RPM
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It floats!
Alright, so since I last posted I managed to find a jet ski trailer and modify it with bunks that will support the boat properly. I am still jammed up with a registration for the boat but I am hoping I will have that all sorted out by the weekend.
In the meantime I pulled the hydro down to the ramp to test the waterline. Without a driver, and with the battery and gas tank moved forward about 18inches I have about an inch of waterline left before water submerging aft end of boat. With battery and gas tank (6gal) all the way aft the waterline is pretty much level with the top of the transom. When I hopped in the level did sort of see-saw back. If I slide the gas tank forward, I am able to get to the transom in case of an emergency. All in all I am pretty happy with how it sits. I would like to replace the 24 series battery w something a little smaller, it is just overkill for this application.
So even though I am unregistered and uninsured I couldnt help myself from taking it for a little spin right in front of the ramp. I believe the technical term for how it runs is: ****-your-pants fast... it is scary how fast this little thing is. I only had about 300 ft of space in the canal to test and registered a speed of 44mph on my phone gps with A LOT of throttle left, leaving ample room to turn around and decelerate. It really accelerates like a bat out of hell. I want to take it out to the flats once this registration comes in for some final tuning.
Next I need to look into seeing what we can do for all the students that worked on this project. Long Island, NY is being hit pretty hard with this virus and I doubt that schools will reopen anytime soon, but something needs to be done.
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Instigator thanked for this postbbezok, Instigator, mrichartz, Hippie459MN, tnelsmn, 89LASER, rock, LakeFever, noli, tux974 liked this post
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05-13-2020, 02:41 PM #1035000 RPM
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awesome job!........she looks great! congrats on a job well done.
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05-13-2020, 03:11 PM #104
Wow!
I am astounded at how well it floats w/that tank and battery in it!
Awesome stuff dude.
And that you got enough of a ride to see what you just built.
Pretty sure I warned you ��
Find a 3 gal tank and a motorcycle or lawn mower battery.
Youll shed 50 lbs.
2 gals is good, 3 is too.
Sucks about the kids.
Maybe once it’s registered, have them meet you at the ramp some Saturday.
On registration, the one I built a couple yrs ago, I took it to them for inspection, showed them my plans and rect’s for materials and was done on the spot.
Love the name too Sean.
Good look to everything you are dealing w/brother.
And CONGRATS!
PS, bring it here and I’ll help you set it up, and teach you how to fly it, ifffff you let me drive ��Last edited by Instigator; 05-13-2020 at 03:14 PM.
I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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05-13-2020, 03:27 PM #1055000 RPM
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Gary, thank you for all your help also thank you for the steering drum. I too was surprised with how well it floats, we did add about an inch and a quarter to the height of the transom. We figured we could use a little extra flotation to counteract the heavier motor. But yes you were right, I dont think I am ready for 70hp yet.
On that note, Rock: a big thanks for donating the motor. This thing is an absolute diamond, and it runs like a sewing machine. The key switch harness you provided also came in handy. We would have been stuck without this. I know I promised you a video of students getting off the boat w a tremendous smile on their face, and I know we will get that one day.
When it happens I'll be sure to post. Thanks S&F
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rock thanked for this postHippie459MN, Instigator, tnelsmn, bbezok, LakeFever, Merc 2.5, 1954bmw, tux974, Jimboat liked this post
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