1442 flat
15hp lifan
i have 2 props and i haven't seen that i just thouught of it but they are a 9'' and a 6''
3600 rpm 500 lbs
20-21 mph

1542 flat
23hp backwater swomp lite 9x6 prop.
21mph myself, 18 mph 2 ppl and gear.

1550 havoc, 35 stock GTR, 3 blade prop, deep water right at 37 mph, with 4 people, shallow with same load is 39 mph. this is allwith gator glide and superb driving.

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6.5 Predator on small Swamp Runner kit, slightly modified but still governed
1432 Lowe riveted flatbottom
15 up river with one person and a trapping load
19.5 down river with one person and trapping load. Saw 20 and change once, but didn't maintain it.
These are at WOT, that rig is more comfortable cruising at 10ish up river and 15ish down river.

Ok guys with predator engines. I have a 22 hp predator engine with a 7x4 prop on a 14 ft john boat motor is mounted on a go devil frame. Loaded or unloaded I run 7-8 mph. Usually I have 2 guys 6 gallon tank battery guns and decoys. I have been watching you tube and reading threads and people are running upper teens to lower 20s. What size propeller do I need to be running. Any help would be appreciated.

I have the same motor as you do and 14 foot v Hull and I two batteries 6 gallons of gas fishing gear cooler for ice soda and beer and 9 inch prop we are transom is 21 inches and I go about 14 miles an hour



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14x36 Flat Bottom
420cc Predator with a Beaver Dam Mud Runner
8" Prop 2 Blade
Air Intake and jetted carbs
Solo pushes about 15-16mph.
Loaded about 11mph

10x36 Grumman
6.5 predator swamp runner kit
7½x5
19-20 solo 16-17 with the load
air intake and oversized jet no muffler

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14x42 monarch flat
22 subaru
74" shaft homemade frame
9x6 wheel
20 mph solo
18 mph 2 adults

Lite load,cooler 2 deep cycle batteries,small tool box and spare wheels.
2060 rpm @ 20 mph.......too much wheel.

1548 Weldcraft
22hp Predator (all stock) on Go Devil bushing frame
9x6 Backwater Prop
20mph solo at 3700 rpm
16mph full load at 3500 rpm

9x6 Backwater Prop broken in running shallow salt water
22.3mph solo at 3950rpm
18.5mph fishing load (wife, 2 small kids etc) 3800rpm

9x5 Go devil Prop
18mph solo at 4000 rpm
15mph loaded at 4000 rpm

I'm also burning about 1gph if anyone cares.

Both these speeds are in deeper water with slight chop. Governor spring is zip tied to spin 4200 - 4300 out of the water. The 9x6 will easily break 20mph solo in smooth water and may get low 20s if I can dial it in. If they made a 9x5.5 that would probably be perfect for a stock Predator 22.

Just did some running and updated speeds are posted up above. The motor now has about 20hrs on it and the 9x6 BW prop is broke in after a couple hrs run time. Saw 3-4mph increase in both speeds.

I swapped to a 1973 16x4 riveted thick hull with marine ply floors and front deck . I'd guess 400lbs easy.
18mph solo with gear in deep water against wind.Fastest was 19mph.
25 kohler GoDevil 9x7 prop with alot of miles on it.
Im pretty satisified.Never ran with 2 people I just put her together.as long as there is wet water like stuff and its soft,She rides thru with ease.

1836 godevil duck skiff
23 gdlt with timing advance and partially gutted stock exhaust turning a slightly worn 9x6 GD prop
Got 19 with 2 men going up river. 21 down river.

Just decided to start posting here bc I have now installed some homemade duals and a 34 MM round slide mikuni. Going to order a 9x7 BW prop and try again soon.
Eventually will do heads and a cam on this motor.



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Great speeds, Flint! Some day I will get a true flat hull and be optimum with my motor. 20 mph is just right.