24' sea ark jon boat 200 gt looper what prop?

[roadkill636]

have a 24' aluminum flat bottom jon boat with a 86 johnson gt 200 fresh rebuild, hyd jackplate, the boat and motor weighs right at 2500# What type of prop should I be looking for? brand? pitch? dia? :confused:

[roadkill636]

not many sea ark fans here ,,,

[ar300johnson]

try a 24 raker and see how it does. rpm should be 58-6100. if rpm is too high try a 26.too low a 22. if prop slips on turns, you might need to try a 4 blade, hyromotive x series props have been good also merc bravo and mirages are both good prop

[roadkill636]

is this concedered a HEAVY boat 2500# all gear gas everything

[roadkill636]

what kind nof speed should I be getting with a 86 200 looper?

[150aintenuff]

19-21P and about 50 MPH aluminum boats especially johns arent " heavy" but they drag alot of water weight with them..... because they dont have alot of lift, i set this hull style up almonst weekly, its our staple fishing boat around here .. 10* or less bottom sleds with 200's run 19's at 5600 at 51 MPH with 1.86 gears and 10" setback will alow a 21 at 5500-5700 and about 53.... need something with alot of lift EVERYWHERE bow and stern.... but more in the bow lift department, a 19P Revolution 4 or a 21 trophy wis where i would start.... trust me I know sleds the best running sleds are tiller controlled with the fuel tank and all the gear with a 400 lb bubba of a driver in the stern..... Trophy's and tempests are the best runners but rakers and mirages do OK revolutions run flat but high, and if you can turn it a bravo works very well.. but being 22+ pitch I doubt it..

[roadkill636]

I got a alum 19,, SS 21 viper,24 raker, 26 cleaver, 27 shooter
still on breakin time so I havent had it over 3500 rpms on the 200 gt yet

[njj502]

I'd be interested to see how it runs out. We got a 75 Mariner on an 18'. 13x21 Michigan Wheel with 6" setback. Whopping 37 at 5200 with two guys in it. :thumbsup:

[roadkill636]

I just got the 10 hours on the fresh rebuild and gave it some short WOT bursts,with the 21" viper the rpms were still climbing at 5600 without playing with the trim or jackplate too much,,Im still running 25-1 double oil pre-mix and 4* retarted on the timing,,plugs are wet black from all the extra oil,,It even DRIPPS from my lu-prop after I shut it off while on the hose!!I still need to adjust my throtole linkage, the butterflies only open up to the 11 oclock position instead of the 12 oclock, sooo I think that should help out a little

[150aintenuff]

I just got the 10 hours on the fresh rebuild and gave it some short WOT bursts,with the 21" viper the rpms were still climbing at 5600 without playing with the trim or jackplate too much,,Im still running 25-1 double oil pre-mix and 4* retarted on the timing,,plugs are wet black from all the extra oil,,It even DRIPPS from my lu-prop after I shut it off while on the hose!!I still need to adjust my throtole linkage, the butterflies only open up to the 11 oclock position instead of the 12 oclock, sooo I think that should help out a little

do the link and sync on the throttles and timing and it sounds like the 21 is gunna be about right... might see 6000

[roadkill636]

my sea ark has a 3* hull,72" bottom that was with 3 people, 1 cooler,kicker motor,large 150# toolbox,
I was hoping after the the timing adj, new plugs, and proper pre-mix I would be able to turn the 24 at 6000

[150aintenuff]

doubt full.... our sled looses 100-200 RPM from totally loaded to totally empty.. you might be able to turn the 24 but it wont be at 6K... just not enough dedrise to free up the hull on sleds

[roadkill636]

went out playing yesterday with the 24 raker, adjusted the carb linkage, and switched over to pensioil synthetic blend,at 32-1 ,and with 2 FULL-SIZE adults and I was able to turn the 24 at 5600 rpms,a little slow at take off but maybee Ill remove the plugs from the ventalation holes from the prop,Istill need to get some new spark plugs, they seem to POP and miss on and off & on.due to the 25-1 oil fouled soaked black porclen tips

[150aintenuff]

dial her in and then go find a 22P to get baqck your RPM

[roadkill636]

just bought a new "turbo" 22p cant wait to try it out saturday

[roadkill636]

tested out the turbo 22 prop, got 6300 rpms out of it, that seems too much ,I think Ill look for a 24 pitch cleaver next........??????????

[150aintenuff]

something doesnt add up... id check the pitch onn that 22.... seems alot short...

[roadkill636]

is there a way to check pitch with ordinary small shop equiptment?
going to a prop shop is 120 miles out of the question!!!!

[150aintenuff]

none that I know of off hand.... although if you can compare a similar style 22 P the blade angle should look similar....

[150aintenuff]

try your raker again... and a sled needs bow lift.... not stern lift..

[RIVERRUMMER 70]

none that I know of off hand.... although if you can compare a similar style 22 P the blade angle should look similar....

UNLESS YOU HAVE SOME SORT OF "LASER EYE" VISION YOU CAN'T LOOK AT TWO SIMILAR PROPS AND TELL ANY VARIANCE IN PITCH WITH YOUR EYES......:rolleyes:
IF A 1" PITCH VARIANCE IS THAT IMPORTANT ON A 45-55 MPH BOAT SEND IT OUT TO A PROP SHOP AND HAVE IT CUSTOM WORKED TO YOUR SPEC'S .....UPS, FED EX, ETC.......:thumbsup:
IF THE BOAT IS COMPLETELY FLAT BOTTOM BOW LIFT WILL DO NOTHING NOR WILL STERN LIFT... IT WILL RUN BEST FLAT.
IF THE HULL HAS A BIT OF ROCKER FRONT TO BACK THEN A "LITTLE" BOW LIFT WILL HELP.
IT'S AN ALUM BOAT NOT AN F-1 TUNNEL OR DRAG BOAT GIVE IT A BREAK.:cheers:

[150aintenuff]

you would be suprised just how much different a 19 and 21 actually are in the actual angle the blades are set on the hub, ( not the rake angle) i say its short so if he can find a KNOWN actual 22 the difference he had in RPM tells me its nearly 5P smaller thats a SERIOUSLY noticable difference even visually... the rake angle may be the same on each prop but the angle of attack on the actuall blade to hub connection will be different enough that he will be able to tell visually, easiest trick I know is to set each prop horizontal to eachother and view from side, thats the angle you want to look at....

and sleds unless tiller powered are NOSE heavy, thus the need for bow lifting propellers, Just to get them to run flat takes ALOT of lift as they like to burry their noses due to weight forward... on narrower sections of beam...

[roadkill636]

http://i30.tinypic.com/okn72r.jpg (http://s3.tinypic.com/okn72r.jpg)this photo was taken this past sunday with the 22 "turbo" at about 6000 rpms and 50 mph,just to give ya some idea of whats going on

[150aintenuff]

if you can drop the motor down a touch.... way to much rooster at neutral trim...

[150aintenuff]

and with 1.86 gears at 6K and 50 mph your running more like a 17P with 10% slip... not a 22... or you have over 30% slip.... 6K and 22P should yeild 60 mph.... doesnt help its running on its nose either...

[roadkill636]

http://i31.tinypic.com/289efyf.jpg (http://s3.tinypic.com/289efyf.jpg)

[150aintenuff]

heres a fairlyy good comparison of what your roost should look like on a sled, your set up is off IMO..


this boat is running 52.2 MPH, at that moment it was turning a 24 chopper 5300 RPM through 2:1 gears, but it ran better with a 21 at 5600 RPM at same speed...

with a 150... and its far heavier than your sea ark

[roadkill636]

Yea, I know it's a little much , aint it !!!!

[roadkill636]

I came across a real good VIPER 17p, it ran at 6400 rpms at 7" below thehull at 6" setback
Great holeshot! I'll be lookn for a 19p VIPER or RAKER next

[150aintenuff]

look for a 19 Raker, or a A45 19 trophy... best props I ever had was a 19 Trophy A45 big hub..

[roadkill636]

150....thanks for keeping up with the replies... I look forward to checking the post,

[roadkill636]

I turned a 19p 3 blade well used alumanum prop 6000
picked up a 19p trophy plus 4 blade..
anchious to try it out !!!!



this trophy plus was a bomb :nonod: way too much slip , I could barley take off and did'nt have neer the performance as a thru hub Viper, it went back on ebay the next day:leaving:

[roadkill636]

after a few months of tuning, timming removed the 8hp kicker motor and 1 battery, I was able to get up to60.1 mph with a 21p renegade offshore prop, with 2 people and coolers and fishn gear


"the best so far":thumbsup:

[150aintenuff]

60.1 is probably as good as you will get light.... ive gone 58.9 with a merc 200 on a 21 boulton forward helm and a 21 A45 trophy.. with zero setback so your numbers are starting to line up nice... i cant wait to try the next boat in my driveway for a prop conversiion as he is going 14" rapid jack, hydraulic verado power steered Merc Big Tiller equipped 200 merc on a 10* super Vee LT and a 22 Bravo 1... It should be the fastest 200 hp prop equiped sled in my area... as it runs almost 50 now with the jet.... and my last conversion ended up gaining almost 20 mph... i am hoping for 65-66 mph....

[150aintenuff]

do the link and sync on the throttles and timing and it sounds like the 21 is gunna be about right... might see 6000


after a few months of tuning, timming removed the 8hp kicker motor and 1 battery, I was able to get up to60.1 mph with a 21p renegade offshore prop, with 2 people and coolers and fishn gear


"the best so far":thumbsup:


so now do i say I told you so... ?????

[roadkill636]

I had the timming set at 14* upon installing the 21 offshore I cranked open the timming 1 1/2 turns,,,"gave the borrowed timming light back weeks ago",
I think I read somewhere here that 1 turn is about 1*...I do need to get that light back

[150aintenuff]

so do i get to say i told you so on the 21 or not..... LOL

[150aintenuff]

I turned a 19p 3 blade well used alumanum prop 6000
picked up a 19p trophy plus 4 blade..
anchious to try it out !!!!



this trophy plus was a bomb :nonod: way too much slip , I could barley take off and did'nt have neer the performance as a thru hub Viper, it went back on ebay the next day:leaving:

sounds like an A47..... not an A45... you would have needed the sealing ring to make it work..

[roadkill636]

150 you told me so:cheers: