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servos for T-Rex 600

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servos for T-Rex 600

Old 03-22-2007, 04:45 PM
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bobthehobo9
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Default servos for T-Rex 600

what kind of servo is the most popular for the T-Rex 600??
Old 03-22-2007, 06:28 PM
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BarracudaHockey
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Default RE: servos for T-Rex 600

Futaba 9252s are well respected for power and speed for 50 size helis.
Old 03-24-2007, 04:33 PM
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wcc963
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Default RE: servos for T-Rex 600

i see alot of people running either Futaba 9251's or Hitec 6965's. both are very well matched for the 600.
Old 03-24-2007, 11:49 PM
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helijj
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Default RE: servos for T-Rex 600

Well for me you really don't need to spend to much on servos.
For example, the trex 600 is ccpm that means that the 3 servos act as collective, elevator, aileron, and pitch.
if you use for example:

Hitec HS-5625MG High-Speed 2BB Metal Gear servo they are 109.7 oz-in at 4.8V X 3 = 329.1 oz of torque .17 sec at 4.8V.

At 6.0v you will have 130.53 oz-in X3=391.53 oz. of torque in the collective and the speed: 0.14 sec/60 degrees and you only spend $165.00 on all 3 servos.

I think that that is more power than what you really use. Other thing is that they are all digital (very important on ccpm system),and metal gear so they won't strip.
Old 12-03-2007, 08:00 PM
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lethalivdrip
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Default RE: servos for T-Rex 600

I got short changed on a Trex 600 kit that came with spectrum ds821 digital servos. I'm missing 2 double arms that were supposed to come with the 3 servos that came in the kit. Any help would be appreciated in hunting down 2 double arms with 30 mm hole spacing for those servos .
Old 12-03-2007, 10:36 PM
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RussWisc
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Default RE: servos for T-Rex 600

lethalivdrip
give you a heads up ,,, DS821s are not a good chose for any heli ,,, I would not use them in any model they are failing most problems i have seen and heard are the final gear the one the arm goes on is braking right at the case ... do a forum search you will see it too
Old 12-03-2007, 10:47 PM
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Druss
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Default RE: servos for T-Rex 600

here is a bulletin from spektrum on the ds821

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.


I'm using BLS451's on my cyclic and BLS251 on the tail for my new trex 600N Pro build.
Old 12-04-2007, 07:28 AM
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lethalivdrip
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Default RE: servos for T-Rex 600

OK I ordered 3 Hitec HS-5625MG High-Speed 2BB Metal Gear Servos.They seem to come with a lot of arms. I just hope one of them has a 30 mm hole spacing.

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