Getting Screwed!

[hpeer]

Originally Posted by Renegde_Sailor

That reverse thrust would be great because that is the one situation where my boat really struggles, you have to be careful to not have too much way on coming into a slip or she isn't stopping.

Long story short.

There is a difference between POWER boat props and SAILBOAT props. A powerboat is maximizes for forward thrust, a sailboat is more of a compromise for the reason you noted.

An amazing number of boats I see have the wring style of prop.

You can see the difference when looking at it. A power prop is more asymmetrical, a sail prop functions much the same in forward and reverse.

Once tou have had the “ah ha” moment you will look at props differently. I casually looked at your photo and I see nothing overly wrong. Still I would take a wander around the yard to look at the different types of props, how symmetrical they are to forward and reverse rotation.

When folks do a prop calculation they MUST assume a prop type or profile. Two props, with identical numbers, and both in good condition, will perform differently depending upon their symmetry.

I suspect you have the proper shape,15 minutes wandering in the yard should prove it.

Good luck.

PS: some pics and explanation

https://www.miwheel.com/propellers/i...at-propellers/

And something more:

https://inthebite.com/2014/11/unders...ys-propellers/