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HelicopterRadio - Servo - Gyro - Gov - Batt › Spektrum DS821 Servos
09-10-2007 02:44 PM  10 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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Are these servos any good for cyclic on a Raptor 50? Are they reliable?

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09-10-2007 02:56 PM  10 years agoPost 2
giaffa

rrApprentice

Sao Paulo - BRAZIL

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According to Spektrum they are not:
http://www.spektrumrc.com/Articles/...px#HobbyWire768

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.

>>> Doing it inverted is better! <<<

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09-10-2007 03:04 PM  10 years agoPost 3
LJS

rrKey Veteran

Minnesota, USA

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Hi Richard,

I've been flying them in my TP5000 powered Swift. I've got over 300 flights on them and have had only one servo fail (started working intermittently). So I'm happy with them in my electric.

However, I put one in my TRex600N on throttle and had it fail hard over in under three gallons. Luckily it went to low throttle and I was able to get it upright and auto it in. I'd definitely stay away from them on nitro powered machines. The guys have been saying they have vibration issues.

Servos are one of those "you can pay me now, or you can pay me later investments." I think you'll be money ahead in the long run if you go with a set of Futaba 9252s on the cyclic.

Keep 'em flying.
LJS

Logo 600 VBar, 10S
TRex 600E VBar, 8S
Logo 500 VBar, 6S
TRex 600ESP, 6S

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09-10-2007 03:08 PM  10 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Are these servos any good for cyclic on a Raptor 50?
NO
Are they reliable?
Not in a helicopter and definately not in a 50 nitro.

Andy
AMA 77227
http://www.jaxrc.com

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