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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BEN SAKS
Received on Thu Aug 20 2009 - 17:59:03 CEST