Re: question for Don S.; weight vs air loads

From: Bill Gowen <b.gowen_at_comcast.net>
Date: Thu, 20 Aug 2009 21:38:22 -0400

But of course if the CG is far enough back then the stab is carrying part of the load. And if you fly with the traditional nose high attitude then some would say (have said) that the prop is carrying part of the load.

  ----- Original Message -----
  From: Benjamin Saks
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Thursday, August 20, 2009 8:58 PM
  Subject: Re: [Indoor_Construction] question for Don S.; weight vs air loads


    I would agree with Fred. Assuming that the wing lift is holding the
  rest of the plane aloft, the wing posts act as tension members and the
  load they carry is the mass of the plane times gravity (force equals
  mass x acceleration).

  It is worth noting that the bending forces acting on the wing posts
  far exceed the tension forces and the design of the posts should take
  these into account.

  On 8/20/09, Fred or Judy Rash <frash_at_chartertn.net> wrote:
> Mark,
>
> Someone needs to start this discussion, so I'll bite the hook. My guess is
> all the weight except the wing.
>
> Fred Rash
>
>
> From: f1diddler
> Sent: Thursday, August 20, 2009 6:48 PM
> To: Indoor_Construction_at_yahoogroups.com
> Subject: [Indoor_Construction] question for Don S.; weight vs air loads
>
>
>
> When an indoor FF model is flying, what percent of a model's static weight
> do the wingposts feel? If I'm designing, for example, a pair of wingposts
> for a PP bipe, and I hang 5 gram weight on the end of a pair of posts (to
> mimic 2.7g rubber + 2.3 grams of parts below posts, etc.) is that anything
> close to loads wingposts feel in flight? Obviously wingposts must withstand
> up force (wing lift) side force (prop torque vs wing) forward force (prop
> thrust) back force (whole model drag) but how much *down* force due to
> weight of whole model?
> Mark F1diddler
>
>
>
>
>
>
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  --
  Sent from my mobile device

  BEN SAKS


  


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Received on Thu Aug 20 2009 - 18:39:50 CEST