Hamid:

Sorry for this ignorant question:  How do you flight test the structural
integrity and strength of an airframe and survive to do anything about it?

You can't bail out of an IVP.  And you would lose the plane anyway -- a
plane that is unique.

What am I missing?

John Hafen

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Hamid
Wasti
Sent: Wednesday, May 09, 2012 10:39 AM
To: lml@lancaironline.net
Subject: [LML] Re: Necessity of A/C in IV-P?

Ted Noel wrote:
> 3. Flight testing with a competent test pilot.
>
> I think #3 is best since it deals with the variabilities of the
> installation and creates a hard VNE number.
Does it? How much margin do you have? Testing is intended to validate
engineering analysis, not to substitute it.

> Also, there are a lot of A/C installations flying. This implies a
> degree of safety.
Does it? How does your installation compare to the flying installations?
How much safety margin do they have and how much will you have? How far have
they pushed their airframe (intentionally and unintentionally) and how far
will you push yours?

All that the flying installations indicate is that no one has done anything
in their aircraft that has led to the airframe failing due to the
modifications. Maybe there is enough margin that it has not compromised
safety at all. Maybe it has cut deeply into the safety margin and there have
been a lot of very close calls that no one has known about.  Without a real
engineering analysis taking the big picture in mind, no one really knows.

Regards,

Hamid

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