I have a ARF trainer(LUCKY STAR 20, 1320mm wingspan, 1600g weight) and I don't know what servo are the best for it.I have 2 options:

-Futaba S3003

-Hitec HS-311

Note: I will use for this plane a Futaba transmitter with a Futaba R-136F receiver

Just about any standard servo should work with this plane. I use Airtronics and Spektrum (JR) servo's, all are pretty much the same, though. All the major servo manufacturers are pretty much interchangeable, but don't mix them (don't put a JR and Futaba on ailerons for instance.. if using dual aileron servo installation). Of couse, if you use only one in the center with a torque arm setup, it won't matter what you use. But, as I said, just about all standard servo's will work.

Thanks for answer!

I will use one servo for ailerons. The problem is that I don't know what to buy:

Futaba S3003 at 12.5 EUR or Hitec HS-311 at 10 EUR. I need to buy for servos(one for ailerons, rudder, elevator and gas throle)

I think that Hitec is more robust and fiable(and a good price), but a man told me to use futaba servos if I use a futaba rc. Is there a compatibility problem?

I think the different brands used to have different servo connectors (plugs). I have understood that new products are all compatible.

All servos can be used, although on some older servos you might need to switch the wires around or make slight modifications to the plug. See attached diagram.

Ken

I would spend a little more extra money (like 1 euro/servo) and buy futaba 3001, since it got bearings.

Both servo's you mention will do fine, but the 3001 is not much more expensive and slightly better in durability.

(Here in the Netherlands you can buy 3 3001 servo's for 35 euro).

I bought 5 Hitec servos for a new plane because they were a bit less $$. Before the plane even left the ground, one of the aileron servos started making a buzzing noise and deflected the aileron to the full down position. When I opened the case I found a cold solder joint. I resoldered the joint and it seemed to work ok but it could have cost me a new plane! I pulled the rest of the Hitecs, cut off and saved the wires, and and threw the rest away away! So now I only buy Futabas. I realize that I may have just got an "odd lemon" but I have bought over 4 dozen Futaba servos since then and have never had a problem with any of them! That speaks volumes to me. I won't go for cheaper servos again! [8D]

Thank you very much Fastsky, that is what i was expected to hear

yes, I have a new J-3-10 cub I can't determin if the servo should be flush or stick out the manual looks to show it being almost flush the servo tray has two blocks one on each end but the manual points to the servo try and not the blocks. the servo that they suggest to use is MH-48 (jsp20040) what do I need to do thank you

Regardless of brand, cheap servos won't be as nice as expensive servos. That's just how it is. Each brand, however, makes fine servos.

Can you at least give us the mfg of the plane or a link to the manual? Not much to go on here unless you want guesses. The more you give us, the better.

I'd use the Hitecs and spend the other 10 euros for fuel or other needs.
My bother has 6 flyable planes, all with Hitec.
I have 4 flyable; half of my servos are Futaba, half are Hitec.
I have about 20 Hitec and 2 or 3 Futaba in the drawer waiting for planes.
The next one out of the box, regardless of price or brand, could be defective.

You need to get the servo arm in a place where you can connect it to the pushrod. You also need to mount the servo (and tray) securely.

THESE SERVOS DO HAVE BALL BEARING, I BOUGHT 4 OF THEM FOR MY 60 SIZE MID-WINGER PLANE.

Mody.


Servo Profile: Hitec HS-311


SPECIFICATIONS:

Class: Standard
Digital: No
Programmable: No
Voltage: 4.8v

General Specs:
- Bearings: Ball Bearing
- Gears: Heavy-duty resin
- 60° speed: 0.19 sec @ 4.8v
- 60° speed: 0.15 sec @ 6.0v
- Torque: 42.00 oz/in @ 4.8v
- Torque: 51.00 oz/in @ 6.0v
- 1.60 x 0.80 x 1.40 inches
- 1.50 ounces


Applications:
- Basic Trainer
- Standard Helicopter
- Sailboat
- Off-Road Car
- On-Road Car
- Power Boat
- Submarine
- Standard Airplane
- All Purpose


Street Price:
$15.55

I buyed the Hitec servo, the price was better. looks great

Alex,

Well those servos do look good, but what about the performance? have you used them so far? Im still waiting for a plane which is lying at the airport which was ordered by my friend for me, and he is so busy and kinda sluggish to get those from the airport. Well, I want your experience about those servos which naturally you like and look good. Let me know.

Safe flying

Mody

You really can't mess up with any of the name brand servos. I have 3 planes with futaba equip and 3 with hitec. I've only had trouble with one futaba and none of the hitec. In my opinion once you get into the higher torque servos hitec gives you more for your money but IMO all the standard size/torque servos are about the same