Are there any "prop" guys on here?
props, are like engines, there are too many combinations to just say "this is what you need".
There are props w/ certain blade designs and # of blades to get close to a good setup for a customer. Then the fine "tuning" is done to really bring a prop into specs and get the most out of the horsepower from the engine,outdrive,hull type, etc. Forget the old theory, 3 blades are faster than 4 blades, that is just NOT TRUE in all cases!
This is certain to be long thread and hopefully some really good reading for all to enjoy.
an easy way to describe "rake" .
Pitch is the actual angle of the blade from the leading to the trailing edge. Rake is the opposite angle, from the tip to the barrell, being the heighth of the tip in relationship to where the blade attaches to the barrell. (lay your hand flat on the table, then pull up your fingers towards the palm, and twist the hand, that's what rake is.) eek!
[ January 15, 2003, 10:36 AM: Message edited by: steve@kps ]