Just did some quick calculations on the servo calc program and if you
drop the speed value down to 50 - 55 mph you will come in around the
55oz torque value of the HS-225's.
I still feel this is too high a speed to be pulling full flaps for
normal TD flying.
RB
Bill Johns wrote:
>
> Greetings!
>
> One of the really neat things about the Multiplex web page is the
> calculator that will help predict the right sized calculator for an
> application. check out:
>
> http://www.multiplexrc.com/calcservo.htm
>
> OK, given that it is an approximation at best, I still get some really
> strange numbers. I'm probably using it wrong.
>
> Given your basic 125" sailplane. weighs say 70 oz, flaps are 2x25 inches,
> they deflect 90 degrees, the wing has a 10" chord and the plane is moving
> at say 75 mph. Yes, this is fast, but not unreasonable for a dive. For me
> the servo calculator gives a required servo of 112 in oz. This is a huge
> servo. Most of us would find a Hitec 225 MG with 55 in oz adequate.
>
> On the other hand, given an aileron on the same plane, again say 2"x25"
> that moves only 30 degrees then the required servo must carry only 37 in oz
> and an HS 85 at 42 in oz.is more than adequate.
>
> Am I doing this right? Whenever I try to come up with a value for flaps,
> it always seems about twice as high as folks use successfully. What am I
> missing?
>
> Thanks,
>
> Bill
>
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