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Thread: Sailaire

  1. #1

    Sailaire

    Sailaire
    by Ryan Crutchfield Mon Jan 25, 2010 11:04 am

    Jay,

    Last Sept. you kindly gave me advice on electrifying a Sailaire, suggesting I use an Atlas 4030 with an ABC46 ESC. Since,
    I've completed the big pig and, with 26 oz. in the nose to simulate motor and battery, it weighs 110 oz. balanced nicely.

    Do you still think the 4020 is right and in regard to the ABC46 ESC, will it's BEC handle four servos as I've installed one for each spoiler??

    Greatly appreciate your help,

    Ryan Crutchfield

  2. #2
    Senior Member Jay Burkart's Avatar
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    Re: Sailaire

    We changed our numbering a little bit on our Atlas motors.
    So now I would recommend a Atlas 4020 (AM4020) motor on a 14 x 9 prop and a 5S lipo.
    That pulls 45 amps, gives about 7 minutes of full throttle time and a climb of about 55 deg
    at the Ready to fly weight of 110 oz.
    You probably can get away with that ABC46 ESC since the servo are just sitting idle most of the time as long as they
    are small low draw servos. Now if you are using higher current servos then either go to a more robust ESC or put in a UBEC.

    Jay
    SAM Grand Champion 2004.07,10,12

  3. #3

    Re: Sailaire

    Thanks Jay,

    I thought I'd mention, though, In my second paragraph, where I said, Do you still recommend the 4020, I meant to say, Do you still recommend the 4030? Sorry about the confusion. If you, in fact, are now, in fact, recommending the 4020, that's fine and I'll order it.

    Thanks again,

    Ryan

  4. #4
    Senior Member Jay Burkart's Avatar
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    Jun 2009
    Location
    Smithfield KY
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    Re: Sailaire

    Ryan,
    I am recommeding the 4020 now.
    Your Sailaire is much lighter than the original simulation that I ran.
    The 4030 would be too much. Darn near 3D performance, on the other hand
    a 3D Sailaire would be a real show stopper. :mrgreen:
    The only thing that concerns me is that the ESC is right on the edge of it's capacity for
    current to the motor.
    You might consider a larger capacity one. In our chart for that motor we recommend a ABC75P
    and that is an opto ESC, then you would use a UBEC to run the servos and Receiver.
    Or if you went with the Jeti JAP70 it has a BEC and a much higher servo loading.
    Jay
    SAM Grand Champion 2004.07,10,12

  5. #5

    Re: Sailaire

    Great!

    Thanks,

    Ryan

  6. #6

    Re: Sailaire

    I will be bringing a Sailaire to Visalia to sell for a friend. His dad was building it 20+ years ago, but it was never completed. It's about 95% framed up and is totally undamaged. I would rate the construction as "very good". The only missing parts seem to be the balsa blocks for the wing tips and tail cone, and the 1" trailing edge stock for the spoiler blades. It includes all plans and instructions.
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