Fw: Honda 135 HP Prop Perfomance Data
Ed & Cindy Doyle
Prop Performance
Here is some data on the Honda BF 135 with Prop A: Is a Stainless Steel 15-1/4’ inch diameter with 15” pitch (15-1/4 X 11), costing $250 –300 depending on source… Prop B: Is an Aluminum 16-inch diameter with 11” pitch (16X11), costing $ 80 on sale.
Prop A gives the best cruising mileage (10 MPH at 3200 RPM with 7-8 Gal/Hr); and also for Max speed mileage (A provides a Max of 4650 RPM engine speed, which will give a max speed 20 MPH burning about 4-5 gal/ hr). The motor’s top RPM is 4680 with this prop, and it’s 135HP rating is for 5000-6000 RRM… But it’s worth it for the great cruising gas mileage, and I only travel the Max speed of 20 MPH when I’m trying to outrun some really bad weather. At idle I get 2-3.5 MPH – depending on the wind; great for docking…
Prop B makes for a great inexpensive emergency prop to keep on board. It will allow the 135 to reach 5250 RPM, if you really need to do that, but it only gives you 17.8 mph at 5250 RPM; and your mileage drops to around 3-4 gallons/hr. This emergency prop is on sale on I—boats com for $79.00. It sure beats paying $120-200 for a spare prop.
Installing both A & B props separately and then running the same speed scenario for each one obtained the data below. I adjusted and optimized the tilt setting within the range of full Down to just under ½ Up to get the best speed at each RPM setting. Boat fully loaded: gas, water, & gear; 2 folks on board! Data Follows:
RPM A Speed - MPH B Speed – MPH
2000 6.3 6.2
2500 7.5 6.5
3000 8.8 8.1
3250 10.1 8.9
3500 11.9 9.4
3750 13.1 10.5
4000 15.2 11.8
4250 17.5 13.0
4500 19.8 14.2
4680 ( A—MAX RPM) 20.1 (MAX SPEED) Not read
5000 N/A 16.9
5250 ( B—MAX RPM) N/A 17.8(MAX SPEED)
I hope you 135 owners & Dealers can use this info. It was hard to get any info on the ideal prop selections for the different engines, from 75HP to 150 HP. Happy cruising ….ed & cy..