Glenn
lowering the flaps gently at a trimmed 80 kts should result in a trimmed
60 kts without needing to adjust the trim.
I remember Ivan was delighted to discover this early in the testing and
bought Don Dykins a pint or two to celebrate!
Don was gracious and put it down to luck.
Graham.
glenn crowder wrote:
> Hi Mike - yes the aircraft will always pitch down with a non symmetrical
> airfoil. This is why
> aerobatic aircraft are designed with symmetrical airfoils - zero
> pitching moment.
> Aerobatic pilots don't like their aircraft pitching without their command!
> Also, in the accident aircraft, losing the tailplane suddenly removed
> 20 lbs of weight off the
> tail, pitching the nose down further.
> If you've ever flown a C-172 while lowering the flaps you will
> probably remember the
> pitch down. Actually, it balloons up first while speed is being lost,
> then pitches down.
> The wing is now very non-symmetrical, requiring up trim on the elevator to
> balance the increased negative CM. The Europa does this too but not as
> noticeable,
> probably because of the powerful tail.
>
> Glenn
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
> From: mikenjulie.parkin@btinternet.com
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Europa Tailplane - Mod 73
> Date: Sun, 15 Jul 2007 10:01:17 +0100
>
> I accept what you say about CM about the aerodynamic centre for an
> aerofoil. But are you saying that irrespective of the CofG of the
> aircraft, an aircraft will always pitch down.
>
> regards,
>
> Mike
>
>
>
> *
>
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> p://forums.matronics.com
>
> *
>
>
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--
Graham Singleton
Tel: +441629820187
Mob: +447739582005
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