Keel cooling pipes

[microlyn]

Does any one have an idea what length and diameter pipe i would need to keel cool a 27 foot cabin boat with a 6 cylinder 2.5 litre diesel turbo engine please, also any other bits of usfull information relating to keel cooling would be welcomed

[MikeJohns]

http://www.boatdesign.net/forums/diy-marinizing/keel-cooling-24959.html

look at the links I posted on the above thread.

cheers