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#11
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Helicopter
RogerN wrote:
"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 The usual optical (digital) tach sold by RC hobby sources reads through a prop blade to a light background - can use mirror tape or a white paint dab too. No synchronizing needed. About $25. I have one. Switchable to read two blade or three blade. Brian W |
#12
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Helicopter
"brian whatcott" wrote in message ... RogerN wrote: "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 The usual optical (digital) tach sold by RC hobby sources reads through a prop blade to a light background - can use mirror tape or a white paint dab too. No synchronizing needed. About $25. I have one. Switchable to read two blade or three blade. Brian W I have one of the kind that read light through the blades, the kind I was talking about was where you view the heli through a shutter that you sync with the blades to read the in-flight rpm. Such as this http://www.heliproz.com/minairtach.html RogerN |
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