Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

Q500 servos

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Old 01-09-2011, 07:59 AM
  #1
djlyon
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Default Q500 servos

It has been my understanding that elevator and aileron servos were required to have at least 42 inoz of torque. Why I thought that I don't know or can't remember. The requirement is not in the AMA pylon rules. Can some one enlighten me.

Denis
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Old 01-09-2011, 09:00 AM
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HighPlains
 
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Default RE: Q500 servos

I think that number was in the rules some years back. But then it was noticed that there were available servos with just two mounting screws that exceeded that torque, so the newer version was written (around 1998) that each primary flight control needed either a servo with 4 mounting screws or dual servos of two mounting holes with one on each aileron or V-tail half.

The reality is that it doesn't take much servo torque to move small surfaces the very small throws used in racing. I used Novac NES-1 servos for years on F1 models that had an advertised torque of 27 oz-in on all flight controls. Only one ran both ailerons that were bigger than a typical quickie, and it's top speed was well in excess of 180 when it was not on the course. The important thing is to use the servo's full travel and gain the mechanical advantage with long control horns and short servo moment arms.
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Old 01-09-2011, 09:09 AM
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Bill Vargas
 
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Default RE: Q500 servos

Denis, are you trying to build a plane lighter than,,, again?



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Old 01-09-2011, 04:55 PM
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djlyon
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Default RE: Q500 servos

Naw. When they increased the min weight to 3lbs 12oz I started building the fuselages from plywood and using sheet rock for wing cores.

Hobby People is selling Airtronics 94819 mini digital high speed servos for 19.99. They list for 60 and the normal Hobby People price is 39.99. On 6 volts they are .07 sec but only 33 in-oz. My memory said not legal for Q500 but when I looked at the rules on AMA I couldn't find a torque requirement.

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Old 01-09-2011, 07:52 PM
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Bill Vargas
 
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Default RE: Q500 servos

Denis, you didn t see that table at the AMA show did you? It was full of JR 3121 and 3421 servos for over 1/2 off !

Carefull with that little stuff,,, they don t like nelson powered vibes[X(]


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Old 01-09-2011, 08:31 PM
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djlyon
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Default RE: Q500 servos

I didn't get to the show this year. I know what you mean about the vibs. When I was building planes 3lbs 4oz I was using hitec 5125s. The gears were done in about 20 to 30 flights. The 5245s are a lot better but still only good for about a year of racing and practice unless I replaced the metal gears with nylon ones from 225s. The Airtronics 94761s seem to hold up real well. They are also minis the same size and weight as the 94819s but the 94761s are about double the torque.

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Old 01-16-2011, 11:54 PM
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Kevin Matney
 
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Default RE: Q500 servos

Hay does any one look at that stuff???
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