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Home✈️Aircraft🚁HelicopterBeginners Corner › Tail rotor servo location?
09-05-2006 12:35 PM  14 years ago
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jwpjr

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Tampa, FL USA

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Tail rotor servo location?
Just curious why r/c helicopters seem to mount the servo for the tail rotor up near the rx and then depend on mechanical linkage to get the tail rotor to do it's job. Why is the servo not located nearer the tail to start with?
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09-05-2006 12:43 PM  14 years ago
Curiousdaughter

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A field near Manchester, UK

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What heli do you have? Some have front mounted tail servos and some have servos nearer the tail. Mine has the servo at what you'd probably call the 'base' of the tail. Still relies of mechanical linkage, but evidently not over as long a distance as it would be with a front mounted servo.

You'd have to ask someone better qualified on the real pros and cons...
* Damaged, Destroyed and Disintegrated - sounds like 3D to me *
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09-05-2006 02:22 PM  14 years ago
DJDAZ

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Perth Western Australia

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It's just the design of the heli between manufacturers.

Raptor's have the servo in the front tray - as u were talking about.

My Century Raven comes with the tail at the base of the boom and frame meaning half the connecting rod length of the Raptor and possible better tail authority.

However i have gone one better and done a boom mount conversion so my servo uses a very stiff and light carbon rod, is mounted on a plate part way along the tail and has no guides to bind on - just a perfect 1 to 1 tail control.

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09-05-2006 03:23 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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Tail rotor servos mounted on the boom are exposed to exhaust oil and much more vibration. They may also contribute to being tail heavy depending on the design and are more exposed to damage in a crash.

Canopy mounted servos need a good linkage or they get sloppy but they are better protected.
Andy
AMA 77227
http://www.jaxrc.com
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09-05-2006 11:19 PM  14 years ago
DJDAZ

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Perth Western Australia

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Thanks for the vibration tip!

I actually have found that my boom servo gets a lot less oil than when it was mounted at the bast of the tail and frame.

I can see your point on the protection factor tho, dunno if mine wound survive a tail in smash
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09-06-2006 02:38 AM  14 years ago
gftazz

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upstate N.Y. in the Adirondacks

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Curtis And His Dad Test Everything.
Curtis Youngblood and his dad are both engineers. He's a mechanical and dad is an electrical engineer and they have tested just about everything to do with helis along the way. They found the highest concentration of vibration on the heli is back at the rear so that's why gyros and the tail servos are mostly mounted up front on the servo tray where there is the lowest vibration in the heli. Also as Barracudaheli stated it keeps it clean and survives in crashes. For the gyro you want a stiff spot on the servo tray area so no movement or flex to get the max gain and effect from the gyro setup and settings. The reason some mount the servo on the rear especially the boom mount is so if you have to retension the belt by sliding the tailboom back it won't effect the tail settings. If mounted the normal way and you have to take the tailboom off or pull it back to tighten tailbelt on some models you may have to readjust your tailrod settings again so your tail won't be off.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!
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09-06-2006 05:40 AM  14 years ago
jwpjr

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Tampa, FL USA

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OK, that makes sense!
Well, these answers certainly make sense! I have an electric machine so the oil, etc. is not of concern, but the other factors explain why the servo ends up so far away. The problem on OutDoo 600 has been that the servo end of the rudder push rod just doens't want to cooperate! It came loose after the first flight (spelled b-o-u-n-c-e) and even after putting it back in place with CA glue it is not stable. The Pro model has the hollow push rod and the servo end has split back about an inch. I have a new one on the way, that should solve the problem.

A million thanks to everyone who responded!
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09-08-2006 04:17 AM  14 years ago
flipped2left

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indianapolis,in.

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My tail servo is located near the tail rotor as far as possible, but i have to extend the wires,(this is on my gasser) less friction and a more positive responseSmile! people will wonder what you're up to!!
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09-08-2006 05:20 PM  14 years ago
ba board

rrVeteran

England

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The other option of course, is to mount a tail servo carbon fibre bracket using the same bolts that hold the boom in place. You get the advantage of a very secure fitting, not as much vibration as mounting on the boom, shorter tail control linkage and the chance to update to a carbon rod.
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