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How fast can a propeller turn?

 
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rwahlgren



Joined: 15 Aug 2003
Posts: 134

PostPosted: Sun Jul 27, 2014 03:09    Post subject: How fast can a propeller turn? Reply with quote

http://www.youtube.com/watch?v=51BEbZlps80

At about 4:45, "a propeller system turning 12,000 rpms."
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kmccutcheon



Joined: 13 Jul 2003
Posts: 191
Location: Huntsville, Alabama USA

PostPosted: Sat Aug 16, 2014 10:55    Post subject: Reply with quote

I would guess that is a "typo"; 1,200 rpm is much more likely.

Propeller rpm is typically limited such that the tips stay subsonic. This is a function of propeller rpm, aircraft speed, altitude and temperature. The tips can be swept back (like the ones in the video) to postpone the onset of shock wave formation.

Model airplane propellers, 3" diameter x 1.25" pitch, on Cox 0.010 in³ Tee Dee engines, turned 30,000 rpm. Large props, intended for the big post WWII bombers, aimed at 800 - 1,000 rpm.

There have been a few unsuccessful attempts to build supersonic propellers. Most notable was probably the Republic XF-84H, which was so noisy that it made people sick.
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