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Helicopter
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October 10th 09, 12:43 AM posted to rec.aviation.homebuilt
RogerN
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Helicopter
"cavelamb" wrote in message
m...
Stu,
Have you seen this one?
http://www.wimp.com/impossiblehelicopter/
There are optical tachs used on R/C heli's that you adjust the speed of a
shutter to make the blades appear still then read the rotor RPM.
RogerN
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