dkshema
rrProfessor
Location: Cedar Rapids, IA
| Directly from the JR Radios website:
www.jrradios.com
| Quote |
| New Guidelines for DS821 Servo Use
Tuesday, February 20, 2007
The DS821 servo is a powerful, accurate sport digital servo recommended for RC airplane applications up to 1.20-size. For helicopters, the DS821 operates best with 30-size glow models, and up to 50-size electric. Loads and vibration in larger models may cause premature failure of the servo resulting in damage or injury to property and persons.
Important: Do not use liquid thread lock with the DS821 servo!
Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear.
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There are pictures over on the Hirobo forum showing a DS821 that was used on the elevator function of an EVO 50. The output shaft sheared off clean as a whistle while the fellow was hovering.
Though they say the DS821 is fine for 50 sized electrics, I would NOT put them in a heli on any flight control, period. I have ONE installed in a Caliber 5, but only on throttle. That's about as adventurous as I expect to get with the 821.
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* Making the World a Better Place -- One Helicopter at a time! *
Dave |
