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What are you all doing now with the High Torque servos on 40% aerobatic airplanes

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  • What are you all doing now with the High Torque servos on 40% aerobatic airplanes

    What are you all doing now with the High Torque servos on 40% aerobatic airplanes
    Question for you all?


    What are you all doing now, on your 40% aircraft

    if you have stepped up and using the newer very high torque servos

    each servo that has over 800 or 1000 ou/in of torque

    DO you still use two of those on the rudder?

    DO you still use two on the ailerons?

    Just think using one less set up on an 40% airplane cuts down the price of the servos by over 200 dollars.

    But that is just as an aside.

  • #2
    I have not used them. But I would use them on my rudder, not much different than ganging servos. I would be leery of the ailerons because you lose that second point of contact (unless you have that tube setup like the Comp Arf)
    Rich
    Krzy4RC
    #IAmIMAC
    SCRD/Newsletter Editor

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    • #3
      Cam....although only a 35% Extra I'm using 3 of the Futaba A700 servos on my Krill. One each on the ailerons and rudder (pull/pull). These composite ailerons are pretty stiff plus I've added a center span CF rib. Haven't maidened it yet....although tomorrow (May 5th) is looking good here. This much servo power is overkill on a 35%, but WTH...🤣

      I will say this....keep your fingers out of any pinch-point areas when you fiddling with these.....or you may be fiddling with one less digit!!!

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      • #4
        A single HP A700 would be fine on ruder IF you can afford to lose the weight of a servo in the tail, which will be tough to do with a 200 on the front. If you need to tail weight you might as well make it functional. I would not go with a single on the ail though. It's not an issue of moving force but that a foam ail with that much surface area just does not have the torsional rigidity to handle being articulated from a single point.

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        • #5
          You can get ailerons as stiff as you want by using cf veil and cf strips running down the ailerons. Use a 0.5 x 10mm cf strip. Use one on top of wing and one at bottom. I just got done doing this veil/strip combo and it’s as stiff as a 2x4. I showed this technique in one of my tip discussions in our newsletters.

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          • #6
            So Earle, I saw the maiden video. SO on that 35% beauty, only one servo per aileron?

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            • #7
              Originally posted by Cam Shahrdar View Post
              So Earle, I saw the maiden video. SO on that 35% beauty, only one servo per aileron?
              Hi Cam....yes, just one on each at the inboard location. These ailerons, while already pretty stiff span-wise, have also been reinforced at their centers with an internal carbon fiber/balsa laminate rib. The aileron horns are also solid,....dual aluminum horns captured to the base plate with a hidden cross-pin and then epoxied into the hardwood block in the aileron....machine screws and all.

              Other than the 10 min maiden I have not had other opportunities yet to expand the flight envelope and fine-tune the setup. It also has spades (aerodynamic boosters) that will be mounted mid-span....after more flight testing. Those big servos don't need anymore power, the spades, while probably somewhat functional, are more for scale than anything else.

              In the attached photo you can see the aileron horn and linkage (HD ball links, titanium turnbuckles, aluminum horns), and further towards mid-span the internal rib extension for the spade.

              This plane was built for scale competition (not IMAC), although could serve as a back-up if needed. My goal is to fly it in a manner than closely replicates the full scale on....gotta cut back on that throttle ALOT!
              Click image for larger version

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              Attached Files

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              • #8
                So correct me if I am wrong here. This is not a true comparison or example of determining if one servo is a viable solution on ailerons. This is a 35% aircraft that is being flown in a scale like manner, not high energy 3D or high energy snap and roll combinations.

                There was a gentleman on FG that went by the name of fixedwing that was a PRO builder of Cardens back a few years ago. One of the last build threads I remember him doing was an ultra light Carden 124 pro with short ailerons and utilizing 1 servo per surface. He ultimately converted it back to 2 servos and full span ailerons.
                TEAM FUTABA
                2014 Intermediate Champion
                2016 Advanced Pattern Champion
                2018 3rd Place Masters Pattern
                I'm just here for the party!

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                • #9
                  Originally posted by Charles Edwards View Post
                  So correct me if I am wrong here. This is not a true comparison or example of determining if one servo is a viable solution on ailerons. This is a 35% aircraft that is being flown in a scale like manner, not high energy 3D or high energy snap and roll combinations.
                  ......
                  Yes Chuck that is correct, although no one implied that it was a "true comparison or example....". It was an answer to Cam's question on my 35% Extra. I would not be surprised if handles high energy snap and roll combinations as well. Flight testing and time will determine that.

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                  • #10
                    Definitely should not have any issues with a 35% especially with composite wings. Cool scale build by the way!
                    TEAM FUTABA
                    2014 Intermediate Champion
                    2016 Advanced Pattern Champion
                    2018 3rd Place Masters Pattern
                    I'm just here for the party!

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                    • #11
                      Click image for larger version

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ID:	1999 Thanks Chuck. Here's the important part

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                      • #12
                        Very nice!
                        TEAM FUTABA
                        2014 Intermediate Champion
                        2016 Advanced Pattern Champion
                        2018 3rd Place Masters Pattern
                        I'm just here for the party!

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                        • #13
                          On my Carden Pro that was originally built for A DA200 I had a heavy Hub and the batteries all the way forward for the 170 Conversion. My rudder servos were mounted on the bottom of the plane ganged in push pull. I switched to single A700 for rudder push pull in the tail and removed the heavy Hub, also upgraded elevator and aileron servos to A700. 10oz savings and WOW the plane flies soo much better, granted the removed servos were around 580in/oz and had over 1000 flights. Plenty of rudder authority!

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