Item 1180
DESIGN: UniCopter ~
Power Train - Assembly - General Arraignment
Drawing:
Notes:
Engagement pulley, on shaft to initial reduction, moves up to engage rotors. This is similar to the Robinson R-22.
This could be the location for a rotor variable speed device, if desired.
A prop extension may be the means of incorporating the rotor drive pulley.
"In order to provide for the transmission of the greatest amount of horsepower per belt, the largest practical diameter of driving sheave should be selected thereby reducing the number of belts used in the drive to a minimum" ~
[Source ~ MDD p.79]
Consider having the activation by Bowden cable to a Destaco clamp type of operational configuration
From PPRuNe ~ 3top:
The closest I ever "saw" was a R-22 belt failure - one of the microswitches involved in the clutch mechanism failed and the clutch would run to max extension before stopped by an end-switch. After 200 hours abuse of the belts they snapped - sucessful autorotation - new belts and microswitch - back in the air ever since. You might want to blame the pilot for this, as it takes nearly two minutes to get to the endswitch whereas a regular clutch engagement should take no more than 1 min with a normal retensioning of about 6-10 seconds after about 5 min flight. Normally a student is told to watch for the time and note changes over time)
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Last Revised: October 2, 2004