TREX 600 Servos - RC Groups
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Sep 20, 2007, 09:07 AM
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TREX 600 Servos

I'm tired of trying to make heads or tails of Align's manual.

Which servos are the hot ticket for a TREX 600?
Good, better, best.
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Sep 20, 2007, 09:18 AM
A man with too many toys
The Futaba S9252 is the most popular – excellent performance and a long life. Street price in the $65-70 range.

The absolute best is the new Futaba Brushless servo – use a BLS451 for eCCPM and BLS251 for the rudder.

Last edited by RC Man; Sep 20, 2007 at 09:24 AM.
Sep 20, 2007, 11:08 AM
Registered User
That servo has a LOT of torque!!

How much torque is required for good 3d performance on a 600?

Thanks for your reply
Sep 20, 2007, 11:21 AM
A man with too many toys
Anything over 80 in-oz is enough for 3D. More torque and speed gives a more snappy response it just depends on how much money you want to spend.

The nice thing about the brushless motor servos is that the motor won’t slow down and loose power like the old brushed motor servos do – brushless should last for a very long time with no degradation in performance. If you are going to spend a lot of money for a set of servos you really don’t want to buy obsolete technology – go brushless.

Sep 20, 2007, 02:13 PM
Registered User
Is 47 oz/in enough for the tail servo?
Sep 20, 2007, 07:26 PM
A man with too many toys
Originally Posted by BiggerDanno
Is 47 oz/in enough for the tail servo?
The tail does not require much torque. For a 600 size helicopter I have seen very fast servos with only 25 in-oz of torque work great. For the tail you want a fast servo with very fast dynamic response (ability to start stop and change directions rapidly). That’s not a published spec – that’s probably why Futaba and JR make servos that are specifically designed for helicopter tail control.

Sep 20, 2007, 11:52 PM
volts x amps = watts.
Wheelhaus's Avatar
CCPM servos will work fine with 40oz (for a heli this size) since all three servos work together. Older mechanical mixing systems where one servo moves a unique function means the servos need huge torque numbers... CCPM gets around this by combining all servos so their individually weaker efforts are amplified by teamwork.

Anything with 60oz or more will have plenty of power for good 3D, more torque means that the servo will get to where you want it to be with more authority, so under hard maneuvers it will feel more locked in. 80 oz is more than enough for competition level stuff.

Some aftermarket T600 frames (i.e. rotorworkz) are designed specifically for Futaba's mini digital s9650. It's a little monster on 6v.

I'd also recommend going for a dedicated tail servo. JR has a new tail gyro/servo combo, the Logictech 6100T is a superb system, and there's always the Futaba Gy611. Both the GY611 and 6100T are competition-level units with dedicated servos that can only be used with their respective gyros. If you want a more budget setup, you can go for Futaba's GY401/S9254 combo.

The only drawback to the GY401 is that it can't control constant piro rates or individual L/R travel adjustments..
Sep 21, 2007, 02:21 AM
Registered User
Thanks again for the help guys.

I'm currently flying a TREX 450 that is teaching me to fly. When I've got it down with this bird, I've got a 4s medusa 450 with programmable head, HS-65hb's, GY401 w/ 9650, & aftermarket frame that should be pretty intense in 3d that I'm building.

I want to equip the 600 with very fast servos that have plenty of power. I'm not concerned with cost, just performance.

I just didn't realize that the larger helis needed so much more torque than the 450.

I'm going to try the Helicommand 3d for a gyro on the 600. If I don't like it, I'll switch to a GY611.

I'm about to bite the bullet for batteries for the 600...
Sep 21, 2007, 03:53 PM
Registered User
Originally Posted by RC Man
The Futaba S9252 is the most popular – excellent performance and a long life. Street price in the $65-70 range.

The absolute best is the new Futaba Brushless servo – use a BLS451 for eCCPM and BLS251 for the rudder.

Since they don't have them in stock, what's your opinion of this servo for the cyclic?

or this one?

Do they fit the 600?
Sep 21, 2007, 05:37 PM
volts x amps = watts.
Wheelhaus's Avatar
the 9252 is in stock.

The airtronics servos you linkes have good specs, but are incredibly fast. Unless you're doing competition 3D with faster stick movements than the Szabos, a servo that fast is a waste of money. If you do want to use them, you should expect much higher amp draw than normal. I'd run dual BEC's to be safe.

I'm using the S9451's in an e620 which are unfortunately discontinued. They draw excessive current when moved too quickly and it was causing my BEC output voltage to droop. Now I run dual BEC's and the voltage stays solid.

ANY standard servo will fit. If you're doing simple sport flight you don't need to be spending $100+ ea. on servos, it's a waste of money..
Last edited by Wheelhaus; Sep 21, 2007 at 05:42 PM.
Sep 21, 2007, 06:15 PM
The Futaba S9451 is the servo of choice (at least for me and everyone I know) over the S9252 because it's got metal gears, can be run on 6.0v, is faster and has more torque. I've also personally witnessed a brand new S9252 strip in mid flight resulting in a huge crash... No thanks!

For the record, the S9451 was discontinued and has been directly replaced with the S9452 ( ).

Another amazing cyclic servo is the JR DS8717 : . This servo has some ridiculously amazing speed and torque ratings.. But with that comes the cost of it being very power hungry. Also, this may be a rumor but I believe that these are the servos that people are running at up to 8.0v for .04 to .05s travel time.


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