Re: Whatever Happened To "Cathedral" Hulls?

geoffm@[EMAIL PROTECTED]
 (Geoff  Miller) wrote in news:TvydnR2K2
_NCnbDVnZ2dnUVZ_rTinZ2d@[EMAIL PROTECTED]
> http://blizzard.zmm.com/thunderbird/starboard.jpg

The note says the aluminum prop is the slower prop. It is normal for a 
steel prop to have faster top speed than aluminum, all other numbers being

equal, because steel allows for thinner blades and thus less drag. The 
steel prop may have slight efficiencies due to shape as well, such as rake

and cupping, which are easier to do with steel and seldom seen with 
aluminum.