Prop Tunnels

[Gone Ballistic]

Hi,

I'm working on an Aluminium Assymetric Catamaran design with twin screws. I need to make shallow prop tunnels to achieve the required prop tip clearance. I've heard various advice about tunnel shape to avoid excess noise/pressure effects. Can anybody give any advice?

Cheers

[tm75tm]

If you do a search for some of Donald Blount's articles and papers on this subject you will be rewarded. Try his homepage first and even try sending them an email.

The articles are pretty spot on and we found them useful for some investiagtions we were doing.

http://www.dlba-inc.com/