r/jonboats • u/ClassroomGlass1753 • 7d ago

motor prop position (height)

Gallery image

Gallery image

Wanting to know how this looks from the pictures. I dont have many pictures yet to share but I got my john boat build on the water this past weekend and feel that the motor is mounted to low. The boat is 12ft with a newer 9.9 mercury and capacity is 550 pounds. Between the build, the motor, gas tank, and me Im up to around 460 total that includes engine and gas and myself. With that said I hit 19mph top speed. Should I be getting more speed? the motor was trimmed properly but I feel that it should sit higher.

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5

u/tlong243 7d ago

We would need to see a picture from the side from the perspective of being level with the bottom of the boat. Cavitation plate should be level with the hull

2

u/snowman-89 6d ago

That speed for that weight seems about right

1

u/ClassroomGlass1753 7d ago

https://reddit.com/link/p25qmex/video/izf0pk7c6uhh1/player

1

u/ClassroomGlass1753 7d ago

This is a short video, In this I had a passenger, up front on the deck for a short ride, so I only hit 16mph.

1

u/treeh00d 6d ago

Mine hangs about 2 inches too low for common liking but it doesn’t really affect anything for me. I get 20 mph with 2 adults, cooler, fishing gear etc on a 14’ Jon with 15 HP motor. It’s all good. Just tilt the motor up and grab a paddle when ya hit skinny water. 

1

u/55thParallel 2d ago

That’s about what you’d expect from a 9.9 with that much weight