Servo help

Hi all, quick question. Putting together an ARTF at the moment, looking at servo choice. Is there any logical reason in choosing a heavier, and physically bigger servo than a smaller alternative if they both produce nigh on the same torque ?

Corona make the following :-
Operating Speed: 0.15sec.60º/ 0.14sec.60º
Stall Torque: 4kg.cm / 4.6kg.cm
Size: 29X13X30mm
Weight: 22g.

They also make this one :-
Operating Speed: 0.15sec.60º/ 0.14sec.60º
Stall Torque: 4.4kg.cm / 5.0kg.cm
Size: 32.5 x 17 x 34.5mm
Weight: 32g

Seems a lot of extra weight and size for a minor increase in torque but the question is, am I missing something, should I be considering another aspect ? Is there advantages to bigger servos that I'm overlooking ?
Would appreciate any help ?

Many thanks

Tom

You don't say which models they are, could it be metal v plastic gearing or some extra internal gizmo?

This chap's review doesn't go overboard on quality with tests on a metal geared Corona unit

www.rcmodelreviews.com/ds538mg_review.shtml

In the past, models were heavy and people would spend a lot of time or money trying to make them lighter. The general rule was that 'lighter flies better'. However, some modern designs are so light that they do not perform so well when the wind gets up and you could argue that 'heavier models fly better in stronger winds'

Regarding Corona...I think there are better manufacturers out there at the same price. This is based on others' reviews and my one experience of a 35MHz indoor receiver that was not fit for purpose.

Mike

I would fit the largest servo poss. IMO the larger gears have the advantage. Second Mike's comment re Corona.

Stuart

In this hobby it always pays to stick with reliable brand names when it comes to radio gear,that's not too say leading brands don't fail sometimes because they do,but you stand a far better chance with them. I am a great fan of Hitec servos been using them for years, but for someone starting out i would take a look at the Savox servo range,superb quality and price.

Pete

My input - Standard Futaba analogue A3003 (plastic geared) and Spektrum (AR6000) I found reliable and long lasting for every day general sport flying But many of my newer models require standard and mini servos and I have favoured Hitec 50xxx and 70xxx digitals (I can program these servos -deadband width, direction, etc, etc) and more often than not metal gears or Karbonite. The former more noisier but strong gears. Most of my Hitec MG minis have just as much torque as their big brothers. Hitec have a vast range too!

Have not tried Savox yet

Many thanks for all responses, need to sit down and work out what would be best. Interesting point concerning overall weight and useage in stronger winds which as you say will favour a heavier servo but other than this, no other reasons.

Sounds like Corona may not favourite, will look into futaba, Savox and Hitec.

Tom

Tom - If you " Google " Woody's Servo Page - you will find a simple list of servos compiled by David Homewood.
List gives specs on 140 servos, although a few years out of date it's a good starting point.
In my smaller models I have used EMAX - 12g servos - ES08MA - metal geared - have been fine in my E-flite Mini Funtana -43 in span & weighing 2 Ib - wing loading only 10.5 ozs per sq ft - but copes fine with wind up to about 12 m.p.h.
The servos are good value from Giant Shark or BRC Hobbies.
Trust this helps or does it add more confusion ?

Regards

Colin.