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General Purpose Servo

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Ashley Hunt27/10/2020 16:00:01
26 forum posts

Does anyone have a view on general purpose servos. I need 5 for a new model that I’m building. There are still a few reputable shops around selling the Futaba S148 servos which was in my mind was a good basic servo. Does the Hitec HS 311 compare favourably, or is there anything else on the market in the same bracket ?

Thanks

Ashley

Richard Wills 227/10/2020 17:03:23
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271 forum posts
7 photos

Savox 0351 is a good sport digital in the same price bracket as a standard Futaba. Worth considering.

Jon - Laser Engines27/10/2020 17:23:16
5754 forum posts
275 photos

the 148 has been the standard budget servo since the 80's i think. the 3001, 3003 are also good options.

I am a fan of the hs311, 322, 422 etc but my only moan is they have an even spline on the output so you cant mechanically centre the arm by rotating it like on futaba and savox servos.

I use the higher spec savox servos in my warbirds (6-10kg digital) and like them alot. I have some 351's, 352's and 252's if memory serves. The 351 is good if you want a little more than a basic servo so it all depends on what you want it for. A trainer or a sport model is not likely to notice the difference, but if you have a bigger aerobatic model for say 90 4 stroke then the savox 351 will give that little extra precision and power.

kc27/10/2020 17:39:18
6946 forum posts
175 photos

At less than half the price of the 148 these standard servos from 4 Max seem attractive. 4Max have a list of servos here with both their own brand and Hitec 311 etc for comparison.

Ron Gray27/10/2020 17:54:48
2521 forum posts
1009 photos

Don’t ignore Corona servos from HK, good centring and excellent value for money.

Skippers Walker27/10/2020 18:14:59
92 forum posts
25 photos

I have several Futaba S148B servos in use, very reliable too. The Corona 339MG seems to be a good replacement and a bit lighter & smaller as well. rclife.co.uk or Hobbyking perhaps?

KBO

SW

Frank Skilbeck27/10/2020 19:16:12
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4932 forum posts
114 photos

Yep the 148 and 3003 have been good reliable go to servos for many years, not tried any yet but Futaba have the new SU300 slightly higher torque digital servo for just slightly more.

Ashley Hunt27/10/2020 19:17:36
26 forum posts

That’s all really useful information. Thanks very much.

Martin Harris - Moderator27/10/2020 19:21:57
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Moderator
9804 forum posts
264 photos

I've been pleased with Corona performance - not so impressed by their brittle mounting lugs.

Matt Carlton27/10/2020 19:23:57
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252 forum posts
42 photos

I've used Futaba 148s and Hitec 311s for years without any problems. I think some of the bad press some servos get is down to incorrect application and poor installation and connection.

Martin Harris - Moderator27/10/2020 19:43:13
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Moderator
9804 forum posts
264 photos

I'm not sure if the comment above was aimed at me but I must point out that my experience with cracked lugs has only ever been with Corona servos.

Bob Cotsford27/10/2020 23:11:44
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8948 forum posts
498 photos
Posted by Martin Harris on 27/10/2020 19:43:13:

I'm not sure if the comment above was aimed at me but I must point out that my experience with cracked lugs has only ever been with Corona servos.

^^^^^^ What Martin said. I've had three or four Corona 339 servos shed their lugs while mounting them. It's taken high speed impacts to break lugs on any other brand. I have however used quite a few other 339s over the years without breaking the lugs.

gangster28/10/2020 07:20:31
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1083 forum posts
29 photos

Since the 80s I have seemed to have automatic chosen Futaba148/3001 or Hitec 422. Never had any issues at all with any of them

Trevor28/10/2020 08:28:21
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567 forum posts
66 photos

+1 for Corona servos. The mounting lugs on some are certainly a weak point but, to be fair, I've only seen them fail after a crash, not in normal use. I do though still have several models with Futaba S148s - and even a few with 128s - still going strong after more than 30 years.

J D 828/10/2020 08:42:57
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1767 forum posts
88 photos

In our club we had a expert builder/flyer who died just a year after retirement.sadHis last large scale project was a Beech 18 twin with 32cc petrol engines I think. It went on to win competitions in other hands.

I asked him what servos he used in the Beech ? 3001's he said the same as he always used just more of them.

Good enough for Brian so good enough for me.

Basil28/10/2020 09:00:44
138 forum posts

Hi, I am a newby. can someone explain the basic differences in 'Micro' , 'Sub micro' and so on. Also how does one select a suitable 'Load' capability(Kgs). I find it very confusing at the moment, all I do is follow the suggestions of the designer/builder , but would like to follow the logic or science behind it. Thanks in advance.

Bas

Matt Carlton28/10/2020 09:02:28
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252 forum posts
42 photos

Martin - Not aimed at you at all, merely that I have been repeatedly told that 311s in particular are prone to failure when that hasn't been my experience. I have seen some truly bad servo installations from a particular (not on the forum) complainant, with grommets missing, servos touching fuselage sides, badly aligned mounting rails, badly aligned connections needing a lot of pressure to bend round to the servo arm etc etc. Yet they insist that the servo is the problem.

Similarly, one reads things like;

"brand x are no good, I put one on the rudder of my 120cc 3D model and the gear stripped within 6 flights. Really slow and poor holding power too"

I would say that most (not all, granted) servos nowadays are generally pretty reliable and adequate for the task if they are used appropriately and we don't ask too much of them.

Nigel R28/10/2020 09:04:48
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4424 forum posts
717 photos

Nobody has asked what you are building yet - what are you building?

That aside, Hitec analogues are always my go to.

311 are perfectly good standard servos (although worth going for 325 instead, they have a ballrace on the output shaft). Standard old school design with single top bearing and the lower bearing is, as was common, also the feedback pot.

The 422(bush)/425(2x ballrace) have a lower bearing for the shaft, so a slightly more durable setup. They are a little larger/heavier because of that. 485 is same size but more torque.

If you are building something 10 / 15cc range, I would use 425s on aileron/elevator and a 485 on rudder.

20cc region, can't speak from experience, but I would think HS625 or 645 or larger.

Former Member28/10/2020 09:21:33
1016 forum posts

[This posting has been removed]

Ashley Hunt28/10/2020 09:36:26
26 forum posts

In answer to Nigel R

The model is a Top Flite P51 Mustang. 60” wingspan, Irvine .61 powered.

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