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Search: Posts Made By: nonstoprc
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02-19-2012, 09:51 AM
Replies: 2,031
Views: 678,319
Posted By nonstoprc

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

My thought is that a hanging Neu motor plus the drive could be the perfect experiment setup. It can be supported via a mount bracket at some middle point of the Neu motor (to balance the whole...
02-18-2012, 05:57 AM
Replies: 2,031
Views: 678,319
Posted By nonstoprc

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Maybe test the hypothesis by hanging the Neu motor + Contra drive on the motor wires?
07-04-2010, 11:59 PM
Replies: 2,031
Views: 678,319
Posted By nonstoprc

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

I was surprised as well the noise increase from CRPs could be 30dB. Probably the noise got cancelled in certain spots in SRPs. Just need to make sure your measure covers the axial direction, which...
07-04-2010, 12:29 PM
Replies: 2,031
Views: 678,319
Posted By nonstoprc

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

The funny noise probably is from high order harmonic sound waves and could be relatively high pitched (see this URL). The cited increase of noise level could be 30 dB at the axial direction. ...
07-02-2010, 10:15 PM
Replies: 2,031
Views: 678,319
Posted By nonstoprc

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Very nice explanations.

On further reading on the subject, it seems to me that normally the two props are chosen such that the front is smaller in diameter considerably, probably to allow less...
06-29-2010, 08:15 PM
Replies: 2,031
Views: 678,319
Posted By nonstoprc

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

I wonder if the Contra driver can work with any f3a outrunner motors. Thanks.
Showing results 1 to 7 of 7


 
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