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Is this servo adequate for a .60 - .90 size sport model

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Old 08-19-2013, 01:26 PM
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karolh
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Default Is this servo adequate for a .60 - .90 size sport model

I am in the final stages of putting together a 65" span sport type model and was wondering if a servo with specs. of .21 sec. / 80 ozs. of torque @ 6.0 volts would be adequate for the ailerons. The model will be used for mild aerobatic sport type flying.

Last edited by karolh; 08-19-2013 at 01:29 PM.
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Old 08-22-2013, 10:52 AM
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Edwin
 
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.21 sec for travel speed at 6v is pretty slow. I have some servos on ailerons at .20 sec travel speed and the roll is pretty slow. I would suggest something in the .14 to .12 sec range.
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Old 08-22-2013, 12:19 PM
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karolh
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Edwin thanks for your reply, but is it only the speed of the servo that dictates the speed of a roll, or is it the combination of servo speed and the amount of aileron deflection.

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Old 08-22-2013, 01:13 PM
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Edwin
 
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I dont know, but I have similar planes with different servos, and I notice a difference in roll rate.
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Old 08-22-2013, 02:17 PM
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I am using these servos and they have been great. I am not using them any where near their ratings. I have mine in a 90 sized 3D plane.

The servo speed will help a little in response time. It will get to full throw faster so the aileron is at full throw faster.

http://www.hobbypartz.com/33p-solarservo-d772.html

Buzz.
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Old 08-22-2013, 06:31 PM
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karolh
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Buzz, the servos in question that I have are the Solar A109 analog as those you are currently using would be way over the top for my needs, plus I need some analog units to go with those I already have for the model.

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Old 08-23-2013, 10:19 AM
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I have Hitec HS-5485HB all around on my Hangar 9 Pulse XT 60 (70 in. WS). These servos are 89 oz/in. and 0.17 sec. at 6V. I have no complaints.
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Old 08-23-2013, 11:50 AM
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Use one of these servo torque calculators and it will tell you everything you need to know:
http://www.mnbigbirds.com/Servo%20To...0Caculator.htm

Servo speed alone, does not translate to aircraft reaction speed. Aircraft reaction speed is a function of servo torque, servo speed and surface deflection. If the servo is not strong enough to deflect the surface, the airplane will go no-where. Plus you need the torque for the servo to move at the speed you would like it to move. Using a servo torque calculator, will give you the required torque for a specific application and then the servo will move at the speed advertised.

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Old 08-23-2013, 01:33 PM
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karolh
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This torque calculator is really neat and an extremely useful tool to have, thanks for sharing. The results obtained from using it makes it quite obvious that we often times use servos much more powerful than what is actually needed to adequately power the control surfaces on our models.

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Old 08-23-2013, 05:33 PM
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Karolh, those servos are WAY more than my needs too, but they are priced well and so I bought them.

What plane are you building? We used to use a single servo for a 65 inch pattern plane so if you use a 90 oz torque per aileron, should be way over kill. I flew my first Goldberg Super Chipmunk for many years with a single Airtronics 94102 standard servo rate at something like 45 ounces of torque powering both ailerons. Never failed me.

I have been using these servo's. They have been great. I have them in 4 planes right now. Not a problem with them. Good price too.

http://www.hobbypartz.com/kahaoubrmo14.html


Buzz.

P.S. If it is worth doing, it is worth OVER doing
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