How do counter-rotating propellers work?

Subject: How do counter-rotating propellers work?

Date: Mon May 31 20:55:42 1999
Posted by Blaine Hankins
Grade level: nonaligned School: No school entered.
City: Saint Helena State/Province: CA Country: US
Area of science: Engineering
ID: 928202142.Eg

Message:


The question is whether piggybacking two identical computer case 
fans will increase the air flow to the case. I think the answer 
is no. I think the principal is the same as for counter-rotating 
props on aircraft. The props have to spin in opposite directions, 
with the pitch of the blades reversed, but I can't explain why.

Re: How do counter-rotating propellers work?

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