Hi Guys,
Been having great fun with my 20cc profile model, but seems like its time to step up to a slightly larger airframe...
Planning on a DLE 35cc powered model from peak, probably the corvus 540.

http://www.peakmodel.com/index.php?m...oducts_id=2344

question for you guys is what servos to run? I have a few Align DS610's which need a home, they can make 12kg tq @ 6v. enough for an 30cc size airframe? or would I need something more powerful?

Anyway, hope someone can give me a bit of advise...

Best regards, and thanks as always.

I use 610s on a 60 cc airframe. They're fine.

Just read the manual for that plane and it simply suggests 5 hi-torque servos. 12kg converts to 166.6 in. ounces of torque. The Aligns are quality servos so I would think that would be sufficient. I say this based on the fact that my 100-120cc planes' manufacturer/manual calls for a minimum 180 in oz metal gear servos, Most people go way overboard on torque and thats certainly not a bad thing, but probably not totally necessary.

Just for fun, I looked up the specs on the servos we used 20 years ago. I had an 85" span Bud Light Laser with Futaba S148's on the ailerons and Quarter scale S134's on elevator(1) and rudder(1). I flew that thing like I stole it for almost 10 years with never a single issue. The S148 has 33 oz in torgue and plastic gears and the larger quarter scale S134 has 112 oz in torque and plastic gears ...

I use nothing but 7990's & 7980's in my large stuff

Hi

I would reccomend the hitec 7954's they have plenty of toque and are very quick

Scott

See what I'm saying? ... I'm hoping posts #5, and 6 were just trying to be funny ... 611oz in & 403oz in torque in a 30cc size plane? ... and like I said earlier, a 33oz in plastic Futaba used to fly a bigger plane than 30cc successfully.

Originally Posted by Mitsu1

See what I'm saying? ... I'm hoping posts #5, and 6 were just trying to be funny ... 611oz in & 403oz in torque in a 30cc size plane? ... and like I said earlier, a 33oz in plastic Futaba used to fly a bigger plane than 30cc successfully.

I also used those std. servos back in the day, some of the servos mentioned are a little overkill.
I think the DS610's would be adequate for sport flying/IMAC, but not for extreme 3d on that airframe IMO. These new planes have real big flight controls with long control horns for the added leverage and to keep flutter in check, also the extreme throws require the use of long servo arms to compensate for the long control horns, which effectively lowers the output torque of the servo. That's why we have to use higher torque servos these days.


ZRX212

Guys, Thanks so much for your responses. Think I will just stick with the DS610's for now, they have been a great servo on the heli's that I have had. I'm not doing anything to 'extreme' just the odd bit of hovering and tq rolling, so I recon they should be ok.

Savox 1258TG. Here are the specs


Dimensions(mm): 40.3x20.2x37.2
Weight(g): 52.4
Speed(@4.8V sec/60): .10
Torque(@4.8V oz-in): 133.3
Speed(@6.0V sec/60): .08
Torque(@6.0V oz-in): 166.6
Gear: Titanium & Aluminum
Bearing: 2BB
Case: Aluminum


They are great servos....strong, durable, and center perfectly

Brian

I dare someone to use servos of much less torque than is suggested in a newer type 3d type plane that is made today. You have to take into count that older aerobatic planes of yesteryear did not have the size of control surfaces that the modern ones do. Even if do only sport flying your going to experience a bad case of flutter and destroy the plane.

here's the thing...3d as we know it was introduced by QQ at the 1994 TOC. Shortly thereafter folks like me who were building airplanes moved hinge lines forward and enlarged surface areas - pretty much to where they are today. digital servos were just hitting the market and torque ratings were lower than what they are now. but the flying style of almost 20 years ago was no different than of today, nor were the control surfaces any smaller than they are today. I sat in the stands at the TOC for years and watched the evolution of 3D, both as pilots and aircraft, and after 1994 everyone was flying 3D, including some high energy and violent stuff (bill hempel comes to mind, and QQ)

I have two airplanes that are outfitted with servos that people have told me aren't strong enough - and of course none of those people have seen them fly. A 60cc Coruvus with Align 610s and an EF 104 Extra with JR 8411s. I didn't outfit them on a dare, I simply chose what I thought would work. I even have a friend who having never owned a 100cc airplane and basing his opinion solely on what he has read tell me that my 8611 wasn't going to be enough on the rudder of my Extra. His opinion changed quickly enough.

I have 8411s on my 150cc 38% Extra...When I bought the plane it had 1" arms on the elevator which I replaced with 1.5" and they work just fine too.

I'm in no way suggesting that people shouldn't buy servos like 8711s but they should buy for their quality, not be bullied into them because they think that anything less is risky.

Originally Posted by FGNewbie

here's the thing...3d as we know it was introduced by QQ at the 1994 TOC. Shortly thereafter folks like me who were building airplanes moved hinge lines forward and enlarged surface areas - pretty much to where they are today.

People were 3Ding RC models long before QQ "invented" it. here is an Avicraft Panic doing 3D, there was a whole team of pilots doing routines like this at various model airshows for years, the Panic appeared in the late 70s or early 80s.

Avicraft / JP Panic 3D Freestyle (with flat spin landing at the end) (2 min 49 sec)

All QQ did was put some of the newer powerful servos in a GS planes.

Originally Posted by bemeson

Savox 1258TG. Here are the specs


Dimensions(mm): 40.3x20.2x37.2
Weight(g): 52.4
Speed(@4.8V sec/60): .10
Torque(@4.8V oz-in): 133.3
Speed(@6.0V sec/60): .08
Torque(@6.0V oz-in): 166.6
Gear: Titanium & Aluminum
Bearing: 2BB
Case: Aluminum


They are great servos....strong, durable, and center perfectly

Brian

I used the savox 1258tg's all around in my 3dhs 72" extra with a dle 35ra and there is no issues with the servos on a 30cc plane. I would not use them on a 50-60cc 3d plane thought

It's unbelievable what we did with S148's,605,s etc and 500 mah battery.