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T-REX 450 › Futaba S-3156 digital metal gear servos...
03-04-2008 07:24 PM  10 years agoPost 1
helimatt

rrElite Veteran

Lafayette, IN

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Anyone using these? The specs look very good, priced like the Hitec HS-65MG, better torque, and digital!

Nick Maxwell wrote briefly that he liked them on the MA Bandit prototype. I have seen or heard nothing else about them. A search on here turned up nothing other than Nick's comment. They are available at Tower for $35

I am going to upgrade servos on the MiniTitan and Trex 450- and preparing to get a Bandit (one or more other helis will have to go then). So looking for excellent servos- the Hitecs are serving me well on the 450's but digital accuracy is hard to pass up.

So who out there already has tried these? By the way, Futaba also has the S-3153MG, less torque, same speed, more money. WHY, oh WHY are they offering both of these? Futaba really confuses me with their myiriads of servo offerings. Just an editorial rant.

Never, ever, ever, ever give up.

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03-05-2008 07:29 PM  10 years agoPost 2
helimatt

rrElite Veteran

Lafayette, IN

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I guess everyone's busy building up their 500's and aren't looking at these 450-sized servos. They look so promising, thought there'd be someone who got them for a 450 they were setting up. Anyway, If/when I get a set, I'll report out.

Funny, I get few responses or none to threads I post. Hmmm, is it my breath?

Never, ever, ever, ever give up.

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03-06-2008 01:03 AM  10 years agoPost 3
baby uh1

rrVeteran

St. James, Mo.

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Servo
I looked really hard at the 3154s for my Comet but went with the 9257 on the tail. I will probably go with one of the 3100 series on the cyclics when I upgrade later.
I'm with you on the number of different Futaba servos as it is confusing to choose the one that you need. Also Hitec is comming out with digital versions of their micros at very good prices.

I don't know how to choose.

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03-06-2008 05:02 AM  10 years agoPost 4
bigdog714

rrVeteran

Rochester, MN U.S.A.

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I just put a set on a 450 I built for a friend, the LHS recommended them for the SE. I only had the chance to hover the heli so far, he broke his wrist snowmobiling last weekend so it will be a few weeks before I get to fly it. He has a 26,000sq.ft. heated warehouse to fly in, I cant wait to check it out. They fit well and set up nicely, and seemed to respond well enough, the only issue I had was the horn length, a long enough arm for nice alignment on the pitch and aileron, caused the elevator to strike the rotation bracket a little in full climb out with full forward at 12deg. pitch and 9deg. cyclic. The standard 10deg. pitch with 7deg. cyclic was fine.

MD 800
Logo 600SE
Logo 14/500 Carbon
Ballistic 700
HD 500V2
Hirobo 50E
Avant 90E

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06-22-2008 09:00 PM  10 years agoPost 5
derekandjennys

rrApprentice

Cedar Rapids, IA

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I ordered a set thinking they sounded great. Exact same mounting as the 65, digital, more torque, same speed, and lighter. Problem is the arms are flimsy. 1/2 as thick and 1/3 as wide and I don't see them working at all. Looks just like the arms that come with the newer 6 gram servos for an indoor foamy. I suppose they would work but i feel they will twist easily.

Derek Powers
Air Thunder Lipo

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06-23-2008 03:51 AM  10 years agoPost 6
baby uh1

rrVeteran

St. James, Mo.

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I have the same problem with the 3110s. The arms are wimpy. Even Walkera servos come with better arms and those are the worst servos on the planet! I guess Futaba thinks that you should go out and buy alloy arms for their servos but you would think that a digital servo would come with decent arms.
Wake up Futaba!

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06-23-2008 05:28 AM  10 years agoPost 7
derekandjennys

rrApprentice

Cedar Rapids, IA

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There are no alloy or other arms available. they are a new spline and nothing else fits either

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06-23-2008 02:44 PM  9 years agoPost 8
TJinGuy

rrProfessor

Socorro, NM - USA

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The s3114 servos I run in my King also have very thin arms and at first I was not sure if they were up to the task but after 200 flights on them, I can say that they work just fine. I think you guys overestimate the stresses on the cyclic servos. I really think the servos are just barely using their torque capabilities. I wouldn't be surprised if it only took 3-4 oz-in per servo for even hard movements because all three servos are working in unison. I could be wrong, maybe once you get a super high head speed and do super hard 3d, you might need a lot more. Anyhow what I am getting at is that under normal circumstances the arms will work great but in a crash, that flexibility might save your servos.

Anyhow the thin arms can also pose mounting issues with the balls. I run Blade400 balls on the King and the threaded part of the balls is nearly 50% the width of the arms. That is also worrisome. I found that Du-Bro sells a line of beefier servo arms for many servos. I have some for my s3114 and they are definitely much beefier, maybe that would be a better choice.

- Chris

Team New Mexico
TJinTech

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