Tail Servos and Normal Servos - RC Groups
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Jun 23, 2008, 10:47 PM
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Tail Servos and Normal Servos

hi guys. Is the tail servo different from the other 3 servos that you use to control the main rotors? and the helicopter specialist from Hobby People recommended this instead of buying the gyro and the 4 servos separately. He told me this has all 4 servos and the nice gyro. does this thing really come with all 4 servos? and is the tail servo included? thanks here is the link.

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Jun 23, 2008, 10:53 PM
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P-38J-Lightning's Avatar
No that does NOT come with 4 servos, it comes with a Gyro, Amp and Tail servo.

Just everything you need to set-up your tail, and it works great! (Got one on my raptor).

Jun 23, 2008, 10:55 PM
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really? Where did you buy it? cause the guy said it comes with all 4 servos and the gyro so its a perfect set.
Jun 23, 2008, 11:10 PM
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P-38J-Lightning's Avatar
It really doesnt

It is a Futaba GY611/9256, which is a Gyro/Tail Servo and that is the standard street price. I got mine at readyheli.com when it was on sale a while back for about $300.

The Hobby-People guy is wrong.

BTW, yes a tail servo generally is different, it usually has much less torque and a much higher speed than the main servos (9256 is a tail servo that is 0.06s/60 Degrees with 47 ounces of torque while my cyclic servos (9252) are 0.14s/60 Degrees with 91.6 ounces of torque.

Jun 23, 2008, 11:30 PM
It appears that there is some confusion here. The link in the original message points to a page describing a combo of the Futaba GY611 and the S9256 servo and there is no reference to the rotor servos.

The tail servo should be fast. Speed requirements for 3 CCPM servos are lower but generally they should have more torque. For example, a quite popular setup is 3 Futaba S9252 servos (.14 sec/60) for the rotor and Futaba S9254 (.06 sec/60) for the tail.

Manufacturers often offer matched pairs of gyros and tail servos that are known to work well. A page referenced by the link is an example.

Obviously, you can use the same servos for the rotor as the tail one (if it is both fast and strong enough) but unless you are Alan Szabo , this would probably be just a waste of money (compare the prices of S9252 and S9254) because you will not see the difference anyway.

So, if you are buying the whole setup, you will need either a gyro/tail servo combo or you can buy gyro and fast tail servo separately, and 3 identical servos (a bit slower but stronger) for the rotor.

Jun 24, 2008, 12:50 AM
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looks like i am going to have to call up the shop again! thanks for the info tho!!
Jun 24, 2008, 04:13 AM
Registered User
There is more to it than transit speed. Futaba gyros and matched tail servos have a higher frame rate - that is they update the position of the servo more frequently. Regular servos operate at 50frame/s. Futaba gyros/tail servos operate at 270frame/s (IIRC). If you use a conventional analog servo or a basic digital servo with a gyro (in digital mode) it will burn out due to the high frame rate.

All the popular leading gyros have high frame rates in digital mode and require a digital tail servo *rated for high frame rates*. Most servos sold specifically as tail servos are digital and will work at the high frame rates generated by modern gyros.
Jun 24, 2008, 01:49 PM
Registered User
alright so guys, what servos should i get for a Trex 600E? cause the guy at hobby people said that the normal servos should be around 13-16 dollars, or a bit more. but I should put my money on the gyro and tail servo. So i can either buy the Futaba 611 gyro+ tail servo (S9256) for $370, or I can buy 3 Futaba S9254 servos for the main rotors, and a Futaba S9254 for the tail. if i do that what gyro should I get? I want a pretty decent gyro. thanks!!
Jun 25, 2008, 11:00 AM
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P-38J-Lightning's Avatar
"Standard" servos have low resolution and are going to just suck in your heli. Look into high end digitals. I personally use 9252's.

Jun 25, 2008, 03:09 PM
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Greybird's Avatar
Have you priced out a complete set-up?

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