Try google. I did. There is no exact formula. It differs for every type of aircraft (helicopters included) based on a variety of factors. You seem to be looking for a concrete answer for a liquid question.
KristySent from my Verizon Wireless BlackBerry
From: "Wolfgang" <Wolfgang@MiCom.net>
Date: Mon, 14 Dec 2009 16:18:01 -0500 To: <lml@lancaironline.net> Subject: [LML] Re: Vne discussion
I'm having difficulty understanding why no one can give direct
answers.
I'm only looking for the various factors that are used to determine
Vne.
Flutter, canopy being sucked off, skin surface excess vibration . . . ? ?
?
. . . not the explecit calculations.
Let's narow it down, what factors for the 300 series and Legacy ?
Wolfgang
Wolfgang,
As has been stated a number of times on this forum, the
determination of Vne is a very complex and multi-discipline task. Not to repeat
what’s been said many times, the several aero engineers that participate in this
forum have suggested that this subject is probably beyond a basic aero
engineering degree. You’re unlikely to find one of these people willing to offer
a “back of the hand” quick solution. LOTS of information on the internet about
this subject, and some serious reading available. a couple of courses on
aeronautical design and finite element analysis will give you some idea of what
you are looking for. Definitely beyond a simple posting on the LML, IMHO.
Bob
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Yes, there was extensive information published here about the Vne
determination.
Scott Krueger |
So . . . am I to conclude that there's nobody on the
list that can identify how Vne is determined ?
With all the experience of posters on this list, I'm
surprised to say the least.
Is this black magic art or is there some real
formula/procedure ?
All I've seen here so far is "is that meadured in IAS,
TAS OR Mach ?" or "what is the speed for xxx airframe ?".
. . . but nothing about how the number comes to
be.
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