[qwertydog]

Hi everyone, I have recently bought a Radian Pro and have a weird problem with it. After assembling it on the dining room table ( Too big for my hobby table ! ) I went through the binding to my Spektrum DX6 and then adjusted all the surface travel and trim as per the instructions. However, with it sitting there with the Tx an Rx turned on there is a loud high pitch whine coming from the aileron servos. ( It wasn't coming from the wife, as she said it was OK to use the table ) I disconnected the push rods from the servos and that did not make any change, the whine is still there, it only stops when I unplug the servos from the Rx. I have not flown this baby yet as I would like to resolve this issue before it takes to the wind. What should I do ?

[Guest]

Hit it with a hammer! Kidding!!!

I have seen this happen when the servo has some tension (resistance) on it in the neutral position. As you have probably noticed, the hinges are foam and taped. You might try un-doing the control rod and manually work in the hinges.

My Son-in-laws aileron control surfaces make an odd noise, but we flew it anyway. I say go fly it, but hopefully others more experienced will chime in here.

[qwertydog]

I disconnected the push rods, so there was no load at all on the servos and they still made that noise. That is the real puzzle to me, I could understand it if they were loaded up with a bit of resistance from the hinges.

[Guest]

Move out to where there isn't a chance of other electrical interference, like outside, and try it with your Tx further away from the plane.

[ddruck]

Work the servos for a while, Parkzone servos are not particularly quality servos but they work and are known to be noisy. My Stryker servos are always buzzing for the last year, but have not failed yet and yes it is a centering issue.
Dan

[Helno]

I looked it up and the Radian pro appears to come with digital servos. These make far more noise than conventional servos because of how they operate.

Analog servos have an Op-amp that determines the drive voltage to the servo motor so the further off position the servo is the more voltage it applied. In a digital servo any position error causes full voltage to be applied, this is why they make so much noise but lso why they have a large amount of holding torque.

Nothing to worry about. Ignore the noise and enjoy the performance.

[qwertydog]

Thanks for all the advise guys ! I have not had this problem with any servos on other planes so this was making me nervous. I had visions of my new toy doing some wild and crazy stunts before the inevitable high speed crash landing.
So now if the weather will cooperate with my work schedule, raining when I work and dry when I'm off, I will give the Radian it's maiden flight. I will let you know how it performed.

[rcmarky]

Originally Posted by qwertydog

Thanks for all the advise guys ! I have not had this problem with any servos on other planes so this was making me nervous. I had visions of my new toy doing some wild and crazy stunts before the inevitable high speed crash landing.
So now if the weather will cooperate with my work schedule, raining when I work and dry when I'm off, I will give the Radian it's maiden flight. I will let you know how it performed.

Hello!
I also believe that this is due to the servos being digital. My servos chirp like magpies in heat on my Radian Pro. I have Hitec 7966's on my Trex 600 NSP that are very loud, but are still running perfectly after 2 years of 'chirping'.

Good luck on the maiden.

Cheers.

[Heliboy]

I also have a Radian Pro and yes one of my aileron servos is making that same high pitch whine...The plane flies quite well and I've not really noticed a significant premature battery drain nor any degree of in flight glitching.

[Hughes500E]

I too own a Radian Pro. I believe the servos are digital!

Great glider!