DivineFocus

Just returned from several days on the water running a four blade 18x13.5/0.120 cup. The 18 in wheel(10 percent tip clearance) didn't...

Good point. I've got just the ticket then. I've put my hands on a 18x13.5x 0.120cup that I'll try this week. I hope I have a similar...

Thanks so much for taking the time to do this. Your calculations are pretty darn accurate. I just finished testing the 17x15 prop and at...

Thanks for all the replies, folks. Sorry I fell silent but I've been on the water most of the elapsed time. I did run the 15" wheel...

Sorry for my poor use of terminology. I should have said the rated speed it 3200 rpm. Apparently Yanmar does not use an electronic...

The blade shape of the wheel in the photos is typical of ACME propellers. They all have virtually the same blade shape. Perhaps because...

I understand ventilation vs cavitation phenomenon. But assuming hull modification is impractical the prop is the only lever to try to...

LoL. No worries. Those who live in lower latitudes can't appreciate our reverence for the summer sun. Happy Solstice! Come Monday I'll...

When I read your comments above I recognized that you were the author of posts in a thread that I read a couple of years ago. At the...

It is likely the propeller is ventilating at high loads. The location is really far aft. Unless it is operating as a surfacing...

Stick with @baeckmo . You are very fortunate he is contributing to you and between him and the VicProp shop; you will find the best...

Assuming that's the case the rule of thumb solution to ventilation with outboards is to increase blade area, go to stainless for a...

Thanks for the feedback. I'm looking forward to his suggestions.

I'm not sure I'd be able to generate a meaningful sketch. I took photos attached below but the boat is on a trailer so it was difficult...

I'm new here and don't yet have rights to start private messages. If you start one with me I assume I'd be able to reply.