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

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  • Earle Andrews
    replied
    Thanks fellows....yeah, it sucks! As I've told some friends...never again will I put that much time and effort into one of these things...Been there - Done that

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  • Steve Sides
    replied
    So sorry to see that Earle. Hate to see anyone lose a plane but after all the 'top shelf' work you did makes it doubly bad. Sorry. Glad it wasn't a single servo failure ! (Just to stay on topic) !

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  • Phil Vance
    replied
    OMGosh Earle!! The pics are hard to look at. WOW, so sorry my friend.

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  • Earle Andrews
    replied
    Thanks Phil....I should add the word "WAS"....😪.
    Just to keep this on-topic, it was no fault of the single servos on the wings.....or anywhere else.

    Good riddance to 2020.....Happy New Year 2021...!!!!!

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  • Phil Vance
    replied
    WOW Earle, nice looking flying machine!! Beautiful work.

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  • Steve Sides
    replied
    I'd be interested it putting one on the rudder a dumping that extra weight in the tail for sure. Ailerons though ???? As previously mentioned you have the stiffness issues of the ailerons to consider going to a single servo. But also consider the mount on the aileron itself. Basically taking all the force generated by 2 servos and 2 mounts and now concentrating that force into a single point. Earle had done an admirable job of beefing up his mount. I'm concerned about the mount giving up the fight. Not so much in complete failure but more of a loosening leading to flutter and all the consequences of that. I'm not sure I want to go down that path to save a few ounces of weight / wiring, etc.

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  • Cam Shahrdar
    replied
    anyone else have experience with single servo on the rudder or on ailerons on 40%
    Last edited by Cam Shahrdar; 01-02-2021, 07:38 AM.

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  • Daniel Powell
    replied
    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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  • Charles Edwards
    replied
    Very nice!

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  • Earle Andrews
    replied
    Click image for larger version

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

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  • Charles Edwards
    replied
    Definitely should not have any issues with a 35% especially with composite wings. Cool scale build by the way!

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  • Earle Andrews
    replied
    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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  • Charles Edwards
    replied
    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.

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  • Earle Andrews
    replied
    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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  • Cam Shahrdar
    replied
    So Earle, I saw the maiden video. SO on that 35% beauty, only one servo per aileron?

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