Servos and Gear Slop
 

Allrighty----- here goes ----- hope this doesn't become one of "those threads" where moderators have to step in.... but here's my deal..... 30% Yak.... 17lb.... not a "3D-er", but pretty strenuous on the bird.... Brand new single 8411's in the wings when new, and now has maybe 35-40 flights. The 8411's have turned to CRAP.... one is jittering, and bouncing at center, the other is bouncing around pretty good.... gears seem to have a LOT of play in them.

I have to admit - the JR 8611A's on elevators seem a LOT less sloppy, and have exhibited nothing remotely like the 8411's....

I've just installed two new 8611A's on the ailerons, and will send in the 8411's....

Here's the question - I've read and heard a LOT about the Hitec 5955TG's being absolutely "THE" best gear train out there, period.

IS IT TRUE?
IS IT WORTH DUMPING THE 8611A's for Hitecs ALL AROUND ????

RE: Servos and Gear Slop
 

Yes!
Im am not sure about the 8611's, I have never used them. But the 5955's are awesome. Get you a programmer too while you are at it and you will never go back.

RE: Servos and Gear Slop
 

I have one 5998 with Titanium gears and the gear train seems really tight. The rest are 8611's and no problem with them.

RE: Servos and Gear Slop
 

Here is my experience with a situation very similar to yours.

I have the same servos on the wings of my 35% Edge.
This plane has single servos in each aileron and a 100cc class engine.

Bottom line is that this plane shakes and rattles and in little time, the newness
of the geartrain is lost. The fact that it's a single servo in each wing doesn't help.

The linkages have a ton to do with what happens to your servo too, and mine are less
than "ideal" with respect to geometry and leverage.
If I put a titanium gear servo in this application will it help?
Maybe, and it may last longer, but in my opinion it will just mask the original problem
for a little longer maybe. Sort of like using a PCM receiver to "fix" a noise problem.
I do have some titanium geared servos, but have not used them yet.

So, would a dual aileron servo set up help? Sometimes.
It didn't on my 40% Cap.

What can I do to alleviate the problem?

I've balanced the prop and tuned the engine the best it can be.
My engines just shake for some reason, especially at idle.
The longer and bigger the aileron, the more the servo gets beat up.

I've made a committment to better understand the geometry of the linkage setup,
but that doesn't help my shaking problem.

I guess I've just resolved myself to the fact that in my case this is just
the price I pay for giant scale flying.
In your case, I'm not sure what you can do, but I'd bet that the new 8611's you
just put in will be in the same condition as the others in time.

This is my experience, your results may vary...

RE: Servos and Gear Slop
 

bob_nj - I think your assessment is probably dead on target; our application just has a LOT of mass out there beating against the geartrain, no doubt about it. This phenom may actually just be "the price you pay", but I want to pay it less frequently.

I've heard from a couple of reliable sources that the hardness and tighter mesh of the Hitec is what makes it last. Do I *know* that? Nope.

But there must be a difference in geartrain quality/fit between the 8411 and 8611A, surely.

Good post! Thank you for your insights!

RE: Servos and Gear Slop
 

Just pulled my 5945's off my 50cc Aeroworks QB Yak due to gear wear after 25 flights. Not bad, but just getting a bit sloppy and making the plane seek. Put in 5955's all the way around. No slop and it's full throw anytime, anywhere, any attitude.

RE: Servos and Gear Slop
 

How many flights on the 5955's so far?

RE: Servos and Gear Slop
 

The gears are tight and are holding up. I have them everywhere in my new Extra and after approx 100 flights I can see no slop whatsoever and my servos get used. I fly hard 3D quite a bit so they are cycling costantly at high deflection rates at least 50% of the time. However, when I fly my sequence they are still tight and I get no sense of "hunting" in any of the surfaces.

The engine vibration does cause my left aileron to resonate slightly at a very low idle, but if I bump it up just a click it stops.
I have a BUNCH of friends that also are using them and some have probably 200 flights on them and same thing. No slop and no problems. All the giant scale guys that I hang out and fly with except one have gone to the 5955's. He is still using the 8611's, but he does not fly but about once a month.

RE: Servos and Gear Slop
 

OK Mike, I will consider you the opitome of optimism and look forward to my 5955's.

Thanks for the kind works aerobob.


What is your collective take on the power of the 5955 vs 8611 on 6 volts?
I've replaced a four servo 8411 set up on my 40% cap with a dual 8611setup with good results.
Can I use two 5955's in place of the two 8611's on the rudder and consider it an even swap?

RE: Servos and Gear Slop
 

IMO, I think they are both so grossly overdoing what we really need that you can't tell the difference in power. I would say yes, the 5955's should be at LEAST as good as if not better than the 8611's. You wont be wishing for more, the 5955's are just sick,, in a good way.:D

Optime of optimism, I like that.;) All I can say is that I have my plane, plus 5 flying friends that all use and LOVE the 5955's in probably 10+ planes. I have yet to hear of a single person regretting them online and I have seen countless people discussing them at various discussion forums on the web.. They are tight, crisp and really deliver the goods IMO.

RE: Servos and Gear Slop
 

Sounds like a plan!

Have a good weekend_bob

RE: Servos and Gear Slop
 

I had futaba 9351 in my composite 2.6m extra , and they would oscillate to and fro at neutral and had a lot of gear slop . replaced all of them with 5955tg and ive deciced that from now on this is the only servo i will choose for any big bird,, its over a year now and they r still as good as new and not even a trace of slop as yet. i have also tried 8611a and they develop a bit of (tick tick ) after 20 or 30 flights .

RE: Servos and Gear Slop
 

Hey Bob, if you want to run 5955's its ok with me BUT, if the JR gods find out they might just explode your plane anyway! haha...
Made a radar clocked pass of 133.6 mph with the Extra last weekend with smoke on of course. Sure raised a few eyebrows ( including mine!!) By the way 8611's sure have been good to me. I have a programmer when you get ready.

RE: Servos and Gear Slop
 

What prop are you running????

A 12-inch pitch at 7,500 RPMs only produces a maximum (no drag/slip) speed of 85mph in level flight.

To get 130mph you'd have to be running an 18-inch pitch (@7500) or turning a 12" pitch at 11,500!

RE: Servos and Gear Slop
 

Bob-
I run all JRstuff - 8611A - to the tiny stuff with my 2.4 Gh radio.
The servo they call the 125 Sport - is in my book -exceptional on 6V-
I flew all spring summer with these on my 1.6 Evolution powered Funtana. never a quiver . and still NO -read that NO gear slop
rated at 125 inch ounces on 4.8- on 6v 140 .
I have a pair of them now (from the Funtana) in my ZDZ80J powered H9 EDGE which really gets cranked around.
This ought to make em or break em.
Th 8611A's in my 42% Extra have slop - but it really does not show up on this monster --in the elevators . one per side on 6V.
here is my EDGE -it is really a good pattern flyer -no joke and can be flown in close - the engine is running 8400 in level flight--on the 3D prop on it -I am taking it off and going back to the slower turning ones -also adding a full internal pipe
all of this will show how well the 125's tolerate high freq's
anyway for 33 bucks the 125 is -in my book a terrific buy- I swapped out the 4721's from my elevators as they broke gears-both sides on a simple flip over in the weeds (no aircraft damage ) the shock inertia from the big elevators simply was too much.

RE: Servos and Gear Slop
 

My JR 8611's seem to operate quieter, but develop some gear slop a lot faster than my high pitched squealing 5955's.

Although I have JR stuff, and I like it, I am really not brand loyal. Between these two servos, the 5955's is really better.

RE: Servos and Gear Slop
 

My friend just spent good bucks to redo 8611's (tops and gears) because he got slop after one season of flying. I put 5955tg in my 30% and they are rock solid this whole year. I just bought a second set to replace some 5945's in my 33% (dual servos per aileron). They are great servo's, same price, and fast as heck. I loved my 8611's but, the hitec's are a STEP-UP!

just my nickle worth.

bobz

RE: Servos and Gear Slop
 

I know it's an EXCEPTIONAL motor, anyway. Throw away the calculator, too, BTW. Those are not close enough for ANY kind of meaningful comparison.

I appreciate all the posts, guys.... common thread seems to be 8611A's are "close", but the 5955TG's are "ON".... thanks again!

RE: Servos and Gear Slop
 

High pitched squealing. [8D] The 5955's will operate silently if you take the time to get rid of all of the linkage binding. The weight of the surface should not make it hum. I kept playing with mine until I got all of the binding out, when the plane is sitting at rest, there is no servo noise at all. Every once in a while one of the aileron servos may chatter just a little... but if I wiggle the sticks, it gets quiet.

RE: Servos and Gear Slop
 

Read All About It!!

All we need now is somebody who wants a boatload of 8611's [X(]

RE: Servos and Gear Slop
 

I have always used JR/Futaba servos since some years ago throwing out a number of the smaller Hitec's that were either faulty straight out the box, or developed faults quickly. Those that survived developed dirty pot track problems and would centre correctly. However this was a number of years ago, things have moved on and Hitec seem to have some bright ideas.

I found the JR 8411's far too sloppy out of the box and they dont therefore work well on the Elevator, i find. The 8511/8611 definitely has a tighter gear train and doesnt hunt around nuetral after centering like the 8411 used to. The Hitec 5955 sounds like a very impressive servo, and, the Hitec servo programmer is almost a reason enough to switch but personally i have a HUGE investement in JR. But the stress I have had setting up JR servos (8511/8611) that are way out of wack with each other in terms of tracking, neutral and end points I am beginning to think again...

RE: Servos and Gear Slop
 

Mike, As long as they are operating (moving), even when sitting on the bench top without a servo arm they are much noiser than the 8611's. The 5955's squeal and the 8611's have a much quiter buzz. I know they are quite when sitting there motionless, but as soon as they are operating they are squealing.

RE: Servos and Gear Slop
 

Bob try the 125 sports - I am serious - they really work -no slop and very very inexpensive.
If you need some 4721 s with new gears - lemme know.
except for my 42% Extra -I find no need for 8611A's . 6 v on 125-200 in ozs servos work fine for me on the 50cc -80cc planes

RE: Servos and Gear Slop
 

I just wanted to throw in my two cents on the 5955TG servos. Theres a few things that grabbed my attention about these servos that made me purchase them. First off was the monster torque they have compared to the other popular ones. I think Futaba has one with the same torque at 6.0 volts also But I went with the Hitec's. Next was the price, you just cant beat the price. Then I compared the speed of the servos with the others. It had more speed than pretty much all of the other ones in this category. It may not of been a huge difference in speed but they were faster.

Titanium gears, That is something I have been wanting for the longest time. You can get any stronger than that.

And last and one thing I think people over looked as did I until I started comparing numbers. It is the weight of the servos. Doing the 3D we do and aiming to make our planes as light as possible lighter servos are a definite plus! Compared to the Jrs 8611A at 2.24 compared to the 5955TG are at 2.18 and I know that is not much difference but it is lighter. And compared to the Futaba's S3306 at 4.48 that is a good difference. You are saving roughly 10 oz. if you go with the Hitec's compared to the Futaba servos. To me 10 oz. is a lot! Everyone hates extra weight that is not necessary.

Now since I have the servos I can say the gear mess is nice and tight. No slop at all. They are a bit loud with that beep digital sound but thats no biggie. Just weird sounding if you haven't heard them before.

But so far so good with them and I would recommend these to anyone looking for some good servos with monster torque.

RE: Servos and Gear Slop
 

dick...haha..i had 2 4721 strip on me last year..I fixed and use them on my "NITRO" planes only. I can afford and will only use one of these
two servos for everything 30% and bigger..8611 and 5955. Good call on everthing Floored, and also you can put those 5955 on the hitec programmer...and really get a checkout. WHERE THE HECK IS THE JR PROGRAMMER!!! I've never stripped a 8611/5955, but I have had to
replace gear/tops for 8611. I'm waiting for my 5955 to wear out!!!!!!!

bobz