Through holes and prop

[Scott T-Bird]

We're in recovery. The boat is hauled. The leaves are turning. Soon snow will be flying. Spring is a long way off.

Speak for yourself ... sailing season is just getting very good! (For a very short while)

 

[Scott T-Bird]

I don’t know the physics for sure, but I’m guessing the shaft RPMs and propeller hub mass have more impact than engine horsepower. I’ve read about some people having issues switching to Flex-o-fold props because the hubs are heavier and weighted further aft than fixed props.

Could be ... we typically operate at a pretty small rpm. MY ski boat operated very smoothly at up to 4600 rpm. My basic point is that I think the ABYC standard may have been written for power boats with much higher output. I still can't be convinced that a spread of 3" or so between the strut and the hub makes a spit of difference with our applications.

 

[Ralph Johnstone]

My basic point is that I think the ABYC standard may have been written for power boats with much higher output. I still can't be convinced that a spread of 3" or so between the strut and the hub makes a spit of difference with our applications.

Be convinced. These people have a more knowledge on the subject than you and I put together. They did not produce a graph showing strut to prop clearance as a function of RPM.

"A little learning is a dangerous thing." Alexander Pope's poem An Essay on Criticism, composed in 1709.