Servo Size
01-04-2015, 09:25 AM
#1
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Servo Size
I purchased a Fly Model 30CC Sbach. I calls for minimum 180 oz. servos. I don't fly 3D. I have some futaba S-3152 servos which are digital and metal gear, but not that much torque. Would they be ok for that plane? Also, I have two servos that are digital 200 oz. torque. Should I put them on the elevator, need two for it, or the aelerons. Your opinions please....
01-04-2015, 10:35 AM
#2
Quite the dilemma, your Futaba servos mentioned are not going to cut it. You could use the pair of 200 oz servos on the ailerons and then get some servos of the correct power fro the rest. Or use one of the 200 oz servos on the rudder as it takes more then the other surfaces and get 4 servos of around 130 oz that would work. Savox is about the best bang for the dollar these days IMO. Their 1258 servo has worked really well for me in the past.
01-04-2015, 11:33 AM
#3
I purchased a Fly Model 30CC Sbach. I calls for minimum 180 oz. servos. I don't fly 3D. I have some futaba S-3152 servos which are digital and metal gear, but not that much torque. Would they be ok for that plane? Also, I have two servos that are digital 200 oz. torque. Should I put them on the elevator, need two for it, or the aelerons. Your opinions please....
Think about it; 3D means that the model is not flying "on the wing" but being suspended by the engine's power and prop wash at a high angle of attack. The real load on servos comes from precision aerobatics. IMAC stuff puts a LOT more load on the servos than 3D.
That said; I usually go 50% more torque than recommended by the model manufacturer and when you get to a certain size, it's better to go bigger still as they can be used in later models that may be bigger.
Just a thought....
01-04-2015, 01:00 PM
#5
I'm not sure where this idea that flying 3D is a torque issue for the servos???? Speed yes, total torque not likely.
Think about it; 3D means that the model is not flying "on the wing" but being suspended by the engine's power and prop wash at a high angle of attack. The real load on servos comes from precision aerobatics. IMAC stuff puts a LOT more load on the servos than 3D.
That said; I usually go 50% more torque than recommended by the model manufacturer and when you get to a certain size, it's better to go bigger still as they can be used in later models that may be bigger.
Just a thought....
Think about it; 3D means that the model is not flying "on the wing" but being suspended by the engine's power and prop wash at a high angle of attack. The real load on servos comes from precision aerobatics. IMAC stuff puts a LOT more load on the servos than 3D.
That said; I usually go 50% more torque than recommended by the model manufacturer and when you get to a certain size, it's better to go bigger still as they can be used in later models that may be bigger.
Just a thought....
01-04-2015, 08:04 PM
#6
Hmmm.... the only cases of flutter that I've observed have been during standard aerobatics.... lol
For the OP; speedracer is right but consider this and it's where I kind of came to the realization that buying just what you need might not be the best way. I was buying servos for a 33% Extra with a 100cc twin on the nose. The model had dual aileron servos, two elevator, one rudder, choke and a throttle. I was into Hitecs at the time for several reasons but suffice to say that the Hitec 7985 would have done the job and that servo was $85.00 each at that time. The next step up was a servo with almost twice the torque and IIRC it was even faster; the Hitec 7955 and it was $95.00 each and could be used on almost any model you cared to pick (no tiny stuff of course....). See what I mean about looking ahead? Now if I had bought the 7985's, sold or crunched the model and the next one needed the 7955's. well I'd be out a chunk of money even after selling the used servos for who knows what they'll bring?
For the OP; speedracer is right but consider this and it's where I kind of came to the realization that buying just what you need might not be the best way. I was buying servos for a 33% Extra with a 100cc twin on the nose. The model had dual aileron servos, two elevator, one rudder, choke and a throttle. I was into Hitecs at the time for several reasons but suffice to say that the Hitec 7985 would have done the job and that servo was $85.00 each at that time. The next step up was a servo with almost twice the torque and IIRC it was even faster; the Hitec 7955 and it was $95.00 each and could be used on almost any model you cared to pick (no tiny stuff of course....). See what I mean about looking ahead? Now if I had bought the 7985's, sold or crunched the model and the next one needed the 7955's. well I'd be out a chunk of money even after selling the used servos for who knows what they'll bring?
