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Old 01-17-2021, 11:00 AM   #11
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Re: Servo Choice For Glider

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Gliders aren’t fussy about what you use unless there is a space issue. I would just use what is on hand. Big small, the weight difference won’t affect performance. HS81 servos are fine, but much cheaper servos would also do the job. You don’t need all that torque but it never hurts to have too much. I have recently used some “recycled” FMS servos from “retired” EDF jets and was impressed with their strength and resolution. Not as impressed with Spectrum servos of similar size.
Talk to your other flying buddies and see if they have some crashed planes with donor servos. As long as they work smoothly under a bit of load, and the wires aren’t damaged, you will be in business.
Zen thinking * It's rebuildable till it fits back in the box. **

Last edited by 4stripes; 01-17-2021 at 11:13 AM.
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Old 01-17-2021, 12:03 PM   #12
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Re: Servo Choice For Glider

Sorry I forgot to update this thread earlier. Servos are installed. I did end up going with a Hitec HS425-BB for the spoilers, and I did use a pair of FP-S148 servos for the rudder and elevator. After all this and some more reading online, they may be overkill, but they do match the size and weight of what was previously installed. Also to note, there was some foam up front with a bunch of lead balls in it, so I would assume if I did go with smaller servos, I would just need extra weight up front anyways. But, what do I know. Just a guess. I have not yet balanced it yet, but it is winter anyways....
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Old 01-17-2021, 03:45 PM   #13
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Re: Servo Choice For Glider

Originally Posted by NEW222 View Post
Hi there Scaleguy. Here are a couple pictures as promised earlier. I did not think there was a model number on these, but apparently I was wrong. They did look like old Kraft servos when I first saw them, but the gentleman that I got it from said they were Heathkit. However, I may be wrong, as I sometimes am....
Yes these are the older Kraft Kps14 servos made by Kraft for Heathkit but the white case was used to differentiate from the Kraft product and to match the white transmitter and receivers. If I remember correctly the torque was around 29.1 in.oz. Information is readily available by googling .
As mentioned by Gary the newer servos out usually produce more power in a smaller lighter package .

Last edited by stegl; 01-17-2021 at 04:16 PM.
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Old 01-19-2021, 07:49 AM   #14
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Re: Servo Choice For Glider

That is a thermal glider and I am assuming you are not going to add a motor. The lighter you can keep it the happier you will be with it's performance in thermal hunting. On a weak thermal day a few ounces of all up weight can make the difference between going home early with a pout or going home late with a poop eating grin!
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Old 01-22-2021, 02:48 PM   #15
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Re: Servo Choice For Glider

I am using Tower Pro sg99 in my glider and they are very good
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