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"slowdown" or "blockage" in prop design

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H.Evan'sRV7A

Well-Known Member
Joined
Jun 2, 2011
Messages
191
Location
Grosse Pointe, MI
I have been a heretic on this subject for quite a while. Most prop designers compensate for "slowdown" of the inbound stream resulting from the body behind the tractor prop (prop in front of cowl). I think that this is very poorly understood and that the designers are missing a lot. This post will not be a full discussion. However, I just came across this video of the aerodynamics of the FIFA soccer ball and it struck me that I cannot see any slowdown. I see deflection, but less than I expected and not as far forward as I expected.

What do you see? What would you say it means for [tractor] prop design? :confused:

Ames Research Center Tests World Cup Soccer Ball - YouTube
 
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