Ron,
Is it possible to make a long final at Vno and at 50' above the figures pull
up for a nearly perfect loop around the setting sun. Then in the 3th quarter
setting out the wheel and flaps before Vna and landing on the figures
without bumps? You better try this than breaking your wings.
Karel Vranken.
----- Original Message -----
From: <rparigor@suffolk.lib.ny.us>
Sent: Friday, December 15, 2006 7:32 PM
Subject: Re: Europa-List: Vne Speed
>
> Hello David
>
> "In Don Dykin's booklet about Europa aerodynamics he says that the flaps
> take just about half of the plane's weight at top flap speed. With
> aerodynamic forces increasing with speed squared I wouldn't want to rely
> on
> the flaps not failing before the wings, which have been tested to 10g
> after
> all!"
>
> Were the XS short wings really tested and held up to 10 Gs, or was it
> closer to 6 before failure?
>
> I think the glider wings are stronger, and perhaps 10 on them?
>
> What I was getting at, is with flaps down you have a wing that kinda sorta
> has 30 degrees washout. Go much faster than max flap extension speed and
> the tips are pushing through at a negative angle of attack, and the area
> near flaps at a positive angle of attack. The net needs to be enough to
> keep the plane in the air. There is this twisting and each half of the
> wing fighting each other that is a very awkward.
>
> Can this fight I speak of overload the wing in the middle and break it?
> Can this fight I speak set up for flutter and break it?
> Can this fight I speak of set up flutter in the ailerons?
> Will the flaps flutter and depart?
> will the flaps overload the attachments and depart?
>
> Don't know exact, but the drag and lift bars double convinced that
> exceeding max. flap down speed is not a good idea, evil begins full
> hearted when you do.
>
> Ron Parigoris
>
>
>
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