Propeller sizing

[Nics]

Please, could someone suggest me a free software for sizing propeller on little wooden boat (15 to 30 feet).

Thank's
Nicolas

[ken mcclure]

No idea, Nic. But if you talk with a propeller shop, I'd bet they would help you out.

Good luck! smile.gif

[John E Hardiman]

Nicolas;

There are no really good software programs for pluging in boat length to get prop size. You need to know as a minimum:

speed you want to go
thrust required
shp available
shaft cl to hull clearence
shaft angle
maximum draft desired

With this type of data you can go to some of the propeller data available in to open literature and solve for what you need.

Try this Italian site (http://www.insean.it/def_it.html) to see what is involved.

[Stiletto]

I downloaded a prop program called Propcalc from Castle Marine. A google search should find it.