Servo power - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-16-2004, 04:26 PM   #11
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Whether or not you will notice the extra precision that an upper class servo brings ultimately depends on your control linkages. Going to a nice fancy servo will do nothing for you if you have slopply linkages, that is where the precision is at.

For most reasonably sized planes you wont be able to truthfully tell the difference between a high torque traditional coreless servo and a digital. I certainly cannot give you a huge YES that my plane is so much better with digitals, it feels different, but its not more precise. Maybe on a giant scale model where the loading is high but not on a 2x2 meter pattern model. What I would stay away from are servos with cored motors if you are looking for precision, a lot of sport servos/sport digitals use cored motors which are IMO no good for any sort of precision enviornment.

In todays market digitals are often times cheaper or the same price as a upper end traditional coreless servo so you may as well get the digital, but I would not hesitate in using "old" technology servos if they came along cheap.

As for speed....I dont like fast servos, anything faster than about .16-.18 is getting too quick for my liking.

Traditional servos take around 10 degrees of travel to reach peak torque, digitals take 1-2 or so. Its not instant but its much sooner than what we had before. Its not uncommon to increase expo or reduce throws because the servo moves the surface more at low deflections due to the increased torque overcoming the air load.
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Old 01-16-2004, 06:46 PM   #12
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I usually go higher in the servo power than is necessary. My way of thinking: the stronger servo is working at maybe 1/2 its max, power and should last a lot longer than a servos rated lower, working at close to the max output.

Anything mechanical working at its max output will have a shorter lifespan and more prone to sudden failures.

I think servos are one area I feel good about haveing a bit of "overkill" rather than wondering when the servo is going to bite it because I am working it too hard....

If a 50 ounce/inch will do I go for a 75 oz/inch. If it calls for a 100 I use a 120.... etc.

More paranoid since I started flying the large scale gassers and my jets.
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1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 01-17-2004, 03:24 PM   #13
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WildBill, If you are on a budget and you think that you will need more torque one option is to double on standard sevos if you have lots of them around. Complicates the setup somewhat but may save your plane. I vote with Andrew here where I think more is better.
DX18 Stealth, H9 Inversa 33, H9 33% Edge, H9 33% Decathlon.
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