Thread: Discussion Efficiency of a ducted fan
View Single Post
Old Jan 31, 2008, 02:26 PM
Odysis is offline
Find More Posts by Odysis
Life begins at transition
Australia, VIC, Sale
Joined May 2007
3,593 Posts
Thrust per power is only usefull if you're comparing two fans of the same size, with the same outlet. A large fan running slowly will produce x thrust much easier than a small fan flat out.

Real efficiencies need to be non-dimensional, i.e. power out divided by power in. Only with non-dimensional numbers can you scale up and down without too many concerns
Odysis is offline Find More Posts by Odysis
Reply With Quote