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 Speed!! MPH 
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New Member

Joined: Sat Oct 01, 2016 2:01 pm
Posts: 1
Post Re: Speed!! MPH
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


Sat Oct 01, 2016 2:17 pm
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MMT Member

Joined: Tue Mar 22, 2016 6:57 pm
Posts: 12
Post Re: Speed!! MPH
1542 flat
23hp backwater swomp lite 9x6 prop.
21mph myself, 18 mph 2 ppl and gear.


Sat Oct 08, 2016 5:52 pm
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Joined: Mon Jan 21, 2013 6:22 pm
Posts: 1094
Location: El Dorado-ish, AR
Post Re: Speed!! MPH
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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'13 GTR35 Stage 2 w/ EVT Exhaust, 1750 Voodoo Custom by DFOU!!


Sat Oct 08, 2016 7:13 pm
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Joined: Thu Mar 05, 2015 8:56 pm
Posts: 91
Post Re: Speed!! MPH
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.


Tue Oct 11, 2016 6:48 pm
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Joined: Sat Dec 17, 2016 6:43 pm
Posts: 2
Post Re: Speed!! MPH
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.


Sun Dec 18, 2016 9:32 pm
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Joined: Thu Jan 31, 2013 5:42 pm
Posts: 1913
Location: Conroe tx
Post Re: Speed!! MPH

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Ole black water keep on rolling

18x54 Uncle J -GTR - with the koolaid
Back H2o SWOMP 23 SS stage 2 15x36 GD Duck Skiff GATOR
GATOR GLIDE PROSTAFF
BACKWATER PROSTAFF
http://www.gatorglide.com

Coupe rest in peace brother


Tue Dec 20, 2016 6:48 pm
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Joined: Tue Mar 15, 2016 5:25 pm
Posts: 13
Post Re: Speed!! MPH
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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Tue Dec 20, 2016 10:18 pm
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Joined: Mon Jun 06, 2016 2:47 pm
Posts: 57
Post Re: Speed!! MPH
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


Sat Dec 24, 2016 3:09 pm
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Joined: Thu Feb 18, 2016 12:05 am
Posts: 71
Location: coral springs ,fl
Post Re: Speed!! MPH
10x36 Grumman
6.5 predator swamp runner kit
7½x5
19-20 solo 16-17 with the load
air intake and oversized jet no muffler


Wed Dec 28, 2016 2:48 pm
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Joined: Mon Nov 15, 2010 4:50 pm
Posts: 2282
Location: Circumcised, Louisiana
Post Re: Speed!! MPH
https://spreadsheets.google.com/pub?hl= ... utput=html

https://spreadsheets.google.com/viewfor ... E6MQ#gid=0


Wed Dec 28, 2016 3:51 pm
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Joined: Sat Nov 10, 2012 10:52 am
Posts: 237
Post Re: Speed!! MPH
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.


Sat Mar 04, 2017 11:27 pm
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Joined: Sat Dec 31, 2016 8:00 pm
Posts: 50
Post Re: Speed!! MPH
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.

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Weldcraft 1548 22hp Predator GDLT


Sun Mar 05, 2017 2:17 pm
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Joined: Tue Oct 21, 2014 7:15 pm
Posts: 80
Post Re: Speed!! MPH
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.


Fri Mar 10, 2017 8:04 pm
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MMT 1000 Club

Joined: Sun Dec 14, 2014 2:21 pm
Posts: 3214
Post Re: Speed!! MPH
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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Sun Mar 12, 2017 3:43 pm
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Joined: Mon Sep 19, 2011 6:32 pm
Posts: 1490
Location: south Florida
Post Re: Speed!! MPH
Great speeds, Flint! Some day I will get a true flat hull and be optimum with my motor. 20 mph is just right.

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Mon Mar 13, 2017 8:03 am
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Post Re: Speed!! MPH


Mon Mar 13, 2017 9:49 am
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