All,
The reference for Vne is CAS (calibrated air speed), not IAS by
definition. If your ASI has been properly calibrated, you read it off
the instrument as equal to IAS.
As to the Vne verification (not test - that's implying it's too risky),
Andy Draper gave me this good recommendation while he was still at
Europa's (starting with the issue of flutter test, which is NOT
recommended):
quote
I would recommend that you do conduct a dive to Vne during your test
flying, but only after you have calibrated your ASI. At Vne you should
move the stick in pitch and roll by a small amount and separately and
also the rudder, but not necessarily tap them. This tapping is a
technique to try to excite flutter where there is a tendency for it to
happen and usually need only be done when establishing the flight
characteristics of a new design. You will be more concerned to check
that the forces have increased with increased speed and that there is
still a tendency for the controls to self centre. It would be most
unlikely that your aircraft does not comply, as the Europa design has
been fully tried and tested.
In the UK, this 'Vne dive' is conducted at each annual flight test. The
favoured technique is to fly and trim at a high cruise speed, say 130kts
level, then progressively pitch down and reduce throttle to
approximately 1/3 open. Carefully monitor the ASI and be careful not to
accellerate beyond Vne. Anticipate Vne by about 5 knots by relaxing
forward pressure. Don't attempt to trim for Vne. When you relax the
forward pressure the aircraft will revert to a climb and slow reasonably
quickly.
unquote
Nedless to say: No wind sheer and no turbulense when this verification
is performed!
Best regards,
Svein
LN-SKJ
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