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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › putting the tail servo up front?
09-07-2006 05:57 AM  14 years ago
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tienman04

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Silver sping, MD

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putting the tail servo up front?
Is there any advantage of putting the tail servo up front in the frame vs the rear? I currently have the servo back in the rear but it gets dirty with fuel every flight. Should I move it up to the front or will I lose some tail authority by doing this?
When all else fails, altitude prevails
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09-07-2006 05:59 AM  14 years ago
cdrking

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Seattle

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Which heli? I don't like putting a $100 servo on the tail with all the oil and vibs back there. Also it's a bit more protected up front.

Jeff
To hover is divine, the alternative is rather PLANE.
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09-07-2006 02:34 PM  14 years ago
Bobwho52

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Phoenix Arizona

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When the servo is on the boom if you have a boom strike and loose the boom you will most likely rip the lead out of the your expensive tail servo. Also exhaust seems to always find a rear mounted servo.A transplant saved my life. Sign your donors card today
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09-07-2006 02:38 PM  14 years ago
tienman04

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Silver sping, MD

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For a Raptor Se. It has both the option of putting the tail servo in the frame or the rear.When all else fails, altitude prevails
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09-07-2006 02:38 PM  14 years ago
JeffM1999

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Erie, CO

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As already stated, it will protect it from oil better if it is under the canopy. As for being protected better during a crash, I would say only slightly, cause it depends on how you crash. If you crash nose down, you would wish all your servos were mounted out back, so that is a toss up, probably a little safer up front, though. As for losing tail authority, as long as you have a nice beefey rod, preferrably carbon, and a nice slop-free bellcrank setup, you won't lose any tail authority at all.
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09-07-2006 03:25 PM  14 years ago
SPB

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Athens - Greece

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Many people like the tail mounted servo set up because (as they claim) the response of the servo is better.

Personally I haven't see any improvement in the response of the tail with the servo mounted on the back. Even if this fixes the balance of my helis (they balance perfectly with the servo on the back) I prefer to have them up front where they are protected from the exhaust residues and the dust. Also even in a nose in crash they are somehow more protected in the servo tray, of course there are crashes that no matter where the servo is you need a trash can so no matter where your servo is the result is the same.

Sotiris
myhelis.com Flying Team
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09-07-2006 04:23 PM  14 years ago
Roamer

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Albuquerque, NM

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I do use rear mounted servos on my Raptor because I like the more direct, simplier connection between the servo and the tail bell crank. This idea was reinforced when I watched a stock raptor go in when the little connector between the two stock rods failed. Less to go wrong.

One consession I do make is I use the frame mounted carbon mount for my servo and not the boom mounted on. It is a bit more secure and you have a lot more vibration damping with the servo being attached to a plastic frame instead of the aluminum tube.

All in all, I really like the way they mounted the tail servo on the T-Rex (and clones) as well as the Audacity Tiger. The servo is still in the rear, but it is enclosed in the frame and tucked up very nicely. It is still exposed to more smoke and oil that a front mounted servo, but it is probably better protected than the normal rear mounted servos. Nice design.
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09-07-2006 04:29 PM  14 years ago
Rui_JC

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Portugal

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Honestly the only reason for me to put the servo in the back is the CG !

My packs are heavy...
Keep it up...literally
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09-07-2006 04:36 PM  14 years ago
RCHeliJim

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Orem, UT USA

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For most helis, there isnt an option. When it is an option on a Rappy, I still put it out back because of CG needs and I also like the direct connection. If you wipe the servo down every flight, it doesnt seem to hurt it as badly. ALso, on my 9253/4s I wrap the seams of the servo with electric tape to seal them up better. Also using a large servo wheel, when possible, blocks much of the oil spray from getting in the servo from the top.

Crash damage is a concern though, I like to keep the tail servo as close to the frame as possible, and leave some slack in the wire.

There are some great front setups out there that use thick rod and bellcranks, and if I had one of those helis, I would keep it in the front probably.

Like I said, most helis dont leave you an option to put it up front without modification to the frame setup.


Go Fly, Have Fun!!
-Team Quick UK
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09-07-2006 07:36 PM  14 years ago
w8qz

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Grand Rapids, MI - USA

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Has anyone tried a 'pull - pull' cable setup for the TR control? Seems like that'd be a lightweight, stiff way to control the tail, leave the servo up front, and not have a long control wire link. It would require a bit of redesign for the control horn in the back, but it should be doable."The helicopter is much easier to design than the aeroplane, but is worthless when done. W. Wright"
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09-08-2006 06:35 AM  14 years ago
SPB

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Athens - Greece

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I think a pull-pull design will have quite a lot of slop and a very complicated design.
Sotiris
myhelis.com Flying Team
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09-08-2006 12:56 PM  14 years ago
Tua

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Norway

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tail or not
I use the 601 gyro system in my R90 SE. Two times the servo cable has loosened inside the servo case. Both times I had a forwarding of lost tail control in a split-second (or two). Another pilot at our field have had the same problem. My new servo is mounted inside the canopy. I hope some cleaver guy will design a tail rod system similar to the synergy (and others), with a pivoting arm in the middle. This I think should be attached to the frame where the boom is fastened.

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09-08-2006 01:06 PM  14 years ago
dkshema

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Cedar Rapids, IA

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I think a pull-pull design will have quite a lot of slop and a very complicated design.
You haven't looked at many pattern planes lately, have you.

Dave
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09-08-2006 01:25 PM  14 years ago
scotter

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Winston-Salem, NC

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Century has been offering the front-mounted servo setup with the Predator for some time. Some guys have adopted this on the ravens as well. Two carbon rods, bellcrank at the rear of the frames. Pretty simple, although not as simple as the boom mounted servo. But really, you're only talking about setting up another carbon rod, so it's not that much work.
I would say the advantages are crash/protection ones, plus of course the changing of the cg. Of course, if you need to shift your cg back, then this is not an advantage for you.
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09-08-2006 02:24 PM  14 years ago
RappyTappy

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Encinitas, CA

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I have never liked rear mounted servos and there is no advantage to it whatsoever. I'm a fan of the bellcranks that some helis are using though.Still buyin' and flyin' then crashing and cryin'
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09-08-2006 02:42 PM  14 years ago
joeyM

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langhorne, pa

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Most if not all of the factory sponsored pilots mount their tail servos up front--if its good enough for them then its certainly good enough for me......joecq cq cq de ka3cnc 30 or 40 mtr cw
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09-08-2006 10:06 PM  14 years ago
SPB

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Athens - Greece

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You haven't looked at many pattern planes lately, have you.
I don't think you can compare in any way the tail control system of a pattern plane with the one of a helicopter. In planes a slight slop can be excused not in a helicopter.

Sotiris
myhelis.com Flying Team
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09-08-2006 10:17 PM  14 years ago
funkyflyer

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Griffith, IN.

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This year, we had 3 tail servo failures with boom mounted servos, and Futaba does not warranty oil soaked servos. (Nor would I expect them to.) Under the canopy does not seem to make any difference in tail authority.Wow, the ground was closer than I thought.
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09-08-2006 10:17 PM  14 years ago
Roamer

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Albuquerque, NM

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Quote
You haven't looked at many pattern planes lately, have you.

I don't think you can compare in any way the tail control system of a pattern plane with the one of a helicopter. In planes a slight slop can be excused not in a helicopter.
Have you looked at full size aircraft lately? A push/pull cable system is VERY tight and slop free when it is set up correctly. It was the standard control system for a LOT of aircraft until the size and speed of the aircraft forced the change over to hydrolic control systems.

Probably my only concern with a cable system would be changes in tension caused by temperature changes. How big a deal would this be? I have no idea.
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09-08-2006 11:20 PM  14 years ago
dkshema

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Cedar Rapids, IA

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In planes a slight slop can be excused not in a helicopter.
It's now perfectly clear that not only haven't you looked at many high-performance pattern ships lately, you also have no idea about the amount of precision control that's required to fly a pattern aircraft and place anywhere in the top ten at a contest.

Dave
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › putting the tail servo up front?
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