gatorsteel
Recruit
- Joined
- Sep 2, 2011
- Messages
- 4
I notice a lot of people have issue with props, or prop questions; Here is my information
I have a PERFECT running 120 HP Johnson long shft, mounted on the transom of a 92 Glastron 20' Cuddy Cabin. Its a heavy boat with Deep Vee.
I had been running a 13.25 x 17 pitch aluminum, but was only able to obtain 4700 RPM, with the perfect trim, 4900 RPM WOT. MAX MPH was 32 MPH at WOT. That was on a glassy day, perfect conditions. The most common was about 28 MPH, 4700 RPM, WOT.
I went to a 13.25 x 15 prop, aluminum prop. Put it on last night after work, dropped it in the water and was hoping for the best! It was choppy and the wind was against me. However, I was able to obtain 5600 RPM, with a top speed of 37 MPH per the same GPS. Half tank of gas, and three other people on board.
I was surprised, but very happy with the results. It stayed on plain better, and the engine did not seem to be working near as hard. Before with the old prop, it sounded like it was a 6 cylinder not struggling, but deeper throaty sound. With the new prop, it sounds like a 4 cylinder that is perfectly humming in tune.
Maybe this will help someone that was working on the prop issues.
I have a PERFECT running 120 HP Johnson long shft, mounted on the transom of a 92 Glastron 20' Cuddy Cabin. Its a heavy boat with Deep Vee.
I had been running a 13.25 x 17 pitch aluminum, but was only able to obtain 4700 RPM, with the perfect trim, 4900 RPM WOT. MAX MPH was 32 MPH at WOT. That was on a glassy day, perfect conditions. The most common was about 28 MPH, 4700 RPM, WOT.
I went to a 13.25 x 15 prop, aluminum prop. Put it on last night after work, dropped it in the water and was hoping for the best! It was choppy and the wind was against me. However, I was able to obtain 5600 RPM, with a top speed of 37 MPH per the same GPS. Half tank of gas, and three other people on board.
I was surprised, but very happy with the results. It stayed on plain better, and the engine did not seem to be working near as hard. Before with the old prop, it sounded like it was a 6 cylinder not struggling, but deeper throaty sound. With the new prop, it sounds like a 4 cylinder that is perfectly humming in tune.
Maybe this will help someone that was working on the prop issues.