View Single Post
Old 12-11-2020, 06:20 PM   #26 (permalink)
aerohead
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,246
Thanks: 24,379
Thanked 7,358 Times in 4,758 Posts
advantage

Quote:
Originally Posted by freebeard View Post


This states that the prolated spheroid has a 15% advantage over a 'bi-hemispherical cylinder' which I assume is a hot dog shape. This is by volume, not frontal area.

My question is why it looks faster backwards. I surmise the area ahead of the propellor acts as an invert Coanda nozzle. Laminar flow all the way to the tail. Maybe a little Meredith Effect?
I'd call it a prolate ellipsoid.
Hot dog is exactly correct. Hoerner has a Cd for that.
Volumetric drag coefficients were also very common for airships and submarine outer hulls.
Just beyond the hatch on the side with the porthole would be about the limit for LBL on the fuselage. It would pop over to TBL beyond there.
All the wings and stabilizers would behave in kind. LBL up to max thickness, then, pow!
Some of the reflexive tail region will be filled in with the sloughing boundary layer.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote