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Question? What's good in cheap servos these days?

Discussion in 'RC Radio Systems' started by Bartman, Nov 16, 2018.

   
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  1. Xpress

    Xpress GSN Sponsor Tier 1

    Bart you should've gone with the HS-1005SGT for all surfaces.

    I'm betting you'd make a lot of people LOL with that decision. $100 airplane, $1800 in servos :laughing:
     
  2. tailskid

    tailskid 70cc twin V2

    Attached Files:

    Snoopy1 likes this.
  3. Snoopy1

    Snoopy1 640cc Uber Pimp

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    Looks really good for $30. It evan has 6 top screws on a 30 dollar servo.
     
  4. Jetpainter

    Jetpainter 640cc Uber Pimp

    I'm considering some Promodeler servos for my next airplane and read today that there can be an issue with them when using a Spektrum Powersafe receiver. Evidently from what I understand there can be power spikes from the servos, I guess trying to feed voltage back into the receiver. On a PowerSafe it won't let the voltage feed back into the batteries so it spikes the servos and can evidently get as high as 9 volts from a 2s LiPo setup. The newer Hitec servos like the 9380 do something similar and come with a P.A.D. Power Absorbing Device that plugs into the receiver to solve this.

    Anyone know anything more about this? I'm going to contact John from Promodeler and see if a PAD would solve this for his servos as well.
     
    49dimes, Alky6 and Snoopy1 like this.
  5. Snoopy1

    Snoopy1 640cc Uber Pimp

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    I have heard the same but not how it was resolved. But as you have explained a capacitor will take care of voltage spikes, just have to pick the correct size and type.
     
  6. Alky6

    Alky6 150cc

    I have seen 9+ volt spikes in my telemetry from the first gen 9 channel powersafe receivers that I have (using 2s lipos). It does seem realistic that a capacitor should solve that problem. I am curious to hear what John says.
     
    Snoopy1 likes this.
  7. Jetpainter

    Jetpainter 640cc Uber Pimp

    I emailed him and asked, I'll let you know what he says.
     
    49dimes, Alky6, AKNick and 1 other person like this.
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