Hi Bill,
When I first observed the oil canning effect I
thought it would be a good thing, but so far I have
not been able to get a model to fly well when I can
flex the wings slightly and make observe oil can
effect. I think your point is well taken, it hard to
control and the sudden change makes trimming hard.
Kurt
--- Bill Gowen <b.gowen_at_earthlink.net> wrote:
> Kurt
> Well oil canning might be actually good if it
> happens and un-happens at the right time. It would
> be really difficult to plan for something like that
> I think.
>
> I'm having a problem with my new catapult glider
> that may be due to that problem. I'm getting a hard
> roll to the left regardless of what I do trimwise.
> It may be the left wing is twisting or bending and
> popping up the flap under launch load.
>
> ----- Original Message -----
> From: Kurt Krempetz
> To: Indoor_Construction_at_yahoogroups.com
> Sent: Sunday, February 11, 2007 4:08 PM
> Subject: Re: [Indoor_Construction] IHLG Flappers
>
>
> Hi Aki,
> I agree as a wing flexes(spanwise)it straightens
> out the flaps. So depending on the stiffness of
> the
> wing in the spanwise direction, this effect also
> contribution to the straightening of the flaps.
> This
> is good point and something one needs to pay
> attention
> to when building a flapper. My experience is that
> it
> is bad if when flexing the wings (spanwise) the
> flaps
> pop up suddenly(I refer to this as oil canning,
> because it is like what happens when you push on
> the
> bottom of a oil can dispensor, it is actually a
> buckling instability issue.) A gradual straighten
> of
> the flaps while flexing the wings spanwise is
> good.
> Are your observations in agreement with what I
> just
> described?
>
> Thanks,
>
> Kurt
> --- Akihiro Danjo <adanjo-373_at_mx1.ttcn.ne.jp>
> wrote:
>
> > I have thought that the flap flatten out mainly
> not
> > due to the air pressure
> > but the bending of the wing,
> > Good flying, Aki
> >
> >
> >
>
> Kurt Krempetz
>
>
>
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>
> [Non-text portions of this message have been
> removed]
>
>
Kurt Krempetz
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Received on Sun Feb 11 2007 - 17:20:00 CET