Honda BF75, 2005 Prop

DW · Posted: Thu Nov 02, 2017 10:28 pm Post subject: Honda BF75, 2005 Prop

Any ideas on selecting a prop for the Honda 75 pushing a C-Dory 22? We'll talk about why I'm replacing the prop on a later post, after running with a new prop and verifying my task is as simple as I am hoping.

thataway · Posted: Thu Nov 02, 2017 11:30 pm Post subject:

It the boat is going to be light weight, then I would go with a 15" x 15" prop.

If heavy, 15 x 13" pitch. You want the motor to reach at least 5500 RPM at wide open throttle.

I carry three props for the 90, which is probably on the same block as your 75.
!5" for most sea level
13" for Powell, and very heavily loaded
11" for heavy loads at Powell, and lakes as high Yellowstone (over 7,000 feet).

Aurelia · Posted: Fri Nov 03, 2017 7:47 pm Post subject:

I posted this on a similar thread two years ago and we are still very happy with the change.

We run a heavily loaded 19 angler with a 2003 Honda 75. We started with a 4 blade aluminum 13 inch 15 pitch prop and it worked ok before we started really loading it up. The planing ability and general response at sea level was OK but we knew it would struggle at higher elevations and our increasing load at the time. I wanted to try a 13x14 but had trouble actually finding such a prop for our motor. So....

We switched to an aluminum 13.25 inch 13 pitch prop last summer thinking the increase in diameter would compensate some for the 2 digit pitch drop.

It has been working great and is now our main prop. We lost about 2.5mph of top speed but the planing is now more effortless, responsiveness to throttle changes, more immediate, and our cruising speed of 14-16 knots still keep the RPM well under 5k. (2017 edit.... I would say around 5k)

We run the boat about as heavy as your average 22 cruiser but have a little less hull to drag.

Hope that helps,

Greg

DW · Posted: Fri Nov 03, 2017 11:56 pm Post subject:

Thank you Bob and Greg, great input. I had hoped to visit the Prop Shop in Mukilteo, WA today but missed my chance. Will chat with them soon. I like the idea of multiple props. At the very least one will be a spare. But now you have me paying a lot more attention to performance. I'll pick two out and document some performance numbers. I anticipate most runs being quite light. And my real preference is to be skimpy on the fuel vs. speed.