Prop Test Info

N

Nunya

New member
CD 25-BF150- 15 5/8 X 13 Honda Solas Stainless Prop- full fuel, water tank half full, 4 adults onboard, fishing gear for the day. Two foot chop.

RPM MPH MPG GPH
2000 6.7 6.3 1.2
4000 12.5 2.3 6
4200 14 2.6 6.1
4400 18 2.6 6.7
4600 20 2.9 6.9
4800 22 3.0 7.4
5950 WOT

This prop works better than the 15 1/2 X 15 aluminum that I was running. I lost some speed at same rpms but am able to spin prop up to 5950. Motor sounds better also. Not working it as hard.
 
How did you derive your MPG data?
Do you plan to complete the experiment to see if there's a peak in the on-plane economy curve (i.e., figures for 5000, 5200, 5400 RPM)?

Paul Priest
Sequim
 
Data was derived from Honda fuel managment gauges. Yes I would like to get more info at different rpm settings. Water was a little rough last trip so didn't get all info I wanted. Have trip planned this week for Montaque Island. This will be around 80 miles one way so should be able to gets lots of info at different rpms. There's a couple more props I want to experiment with if I can get my hands on them. I'll post results.
 
I am going to start the great prop experiments on a 25 I bought a few weeks ago. The motor is a Yamaha 150. I have found that A-1 Propeller in Anchorage stocks quite a few props and they will let you try before you keep it. I plan that route with my experiments. Looking at you data from Jun, I would recommend you look for a 14 pitch prop. They are hard to find sometimes but will still keep you well into the WOT range and may give you a little better economy. I found a stainless 14 pitch prop on my Honda 90 gave the same performance as a 15 pitch aluminum on the top end, but much improved low speed performance.

Tom
 
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