Hi Mike - yes the aircraft will always pitch down with a non symmetrical ai
rfoil. This is why
aerobatic aircraft are designed with symmetrical airfoils - zero pitching m
oment. Aerobatic pilots don't like their aircraft pitching without their c
ommand!
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 r
emember 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 t
o
balance the increased negative CM. The Europa does this too but not as not
iceable,
probably because of the powerful tail.
Glenn
From: mikenjulie.parkin@btinternet.comTo: europa-list@matronics.comSubject:
Re: Europa-List: Europa Tailplane - Mod 73Date: 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 air
craft will always pitch down.
regards,
Mike
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