Testing out the speed of the 1436 LT Alumacraft jon boat paired with a Predator 13 hp 420cc engine and an SPS Swamp Runner Longtail Mud Motor Medium Kit.
This is the tachometer that I use and really like – https://amzn.to/2N0KeXe – I like the settings that it has. It keeps track of your engine hours and your RPMs. It will also track what your highest rpm was that you reached during a run. So I really engine it.
The top speed of this 1436 LT jon boat is around 20 mph. After 20mph, the wake behind the boat stretches out further than the tail can reach causing the longtail to jump out of the wake. To fix that, you just pull up on the tiller handle more and force the prop in the water.
The prop that I tested out first is the 9-inch regular prop. The top speed I got was 23 mph. That was with pulling up on the handle and forcing the prop down in the water to get the max speed I could get from it. At 20 mph it handles with ease, the RPM’s were around 2600 to 2800, and it just floats in that crest.
In the end, I put the 8.75″ weedless prop on. It is the smoothest riding prop that I’ve put on it. It has the least amount of vibration and it’s weedless! The normal speed I get with this prop is 19 mph and if I have the wind with me I’ll get 20 mph.
So after testing these two props, I would put the 9″ prop on it and run it at 20 mph at 2600 to 2800 RPMs so it would be better on fuel and less vibration.
The 8.75″ weedless prop handles nicer than the standard 9″ prop and it’s weedless but it is slower.
I normally run the weedless prop for everything but if I was to do a long trip I would run the 9″ prop.
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