SailNet Community - View Single Post - Future of Sailing?
View Single Post
  #24  
Old 10-22-2006
Quetzalcoatl's Avatar
Quetzalcoatl Quetzalcoatl is offline
Member
 
Join Date: Aug 2006
Location: Dallas, TX
Posts: 31
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Quetzalcoatl is on a distinguished road
prop drag

Hellosailor, you raised an interesting question about prop drag when a boat uses propellers to generate electricity. This subject seems complex to me. I have read diametrically opposed opinions about prop drag: assuming a fixed-blade prop, is the drag more or less when it is spinning/freewheeing compared to locked and stationary? Some claim that cavitation causes a stationary prop to lose drag with increasing boat speed. While it's intuitively obvious that a folding/feathering prop has less drag, there are probably more boats on the water with fixed props. How much loss in boat speed would there be for those boats if allowing the props to turn a generator? I'm sure there must be some, or everyone would have prop shaft generators!
Reply With Quote Share with Facebook