REFLECTOR: Vne Revisited

[Scott Derrick]

VNE in GA powered airplanes is usually given in indicated airspeeds 
because that is the kind of airspeed instrument we have.

Bill  is right that VNE for flutter is directly related to TAS and in 
gliders and high speed airplanes is given as a TAS or reference to it.  
Gliders have a sliding scale in indicated referenced to altitude and 
temp, a poor mans tas scale.

There has been some great discussions on this on the VAN's forums.

Though I still think that John is right, the demonstrator hasn't hit the 
VNE for flutter yet.  Not because the IAS was below 200 but because the 
TAS was below the limit real limit.

Scott
 

Paula & John Schoorl wrote:
> I disagree.  Vne is always given as indicated airspeed.  By hitting 256 kt
> TAS they are probably not exceeding their Vne recommendation of 200kt IAS.
>
> John Schoorl
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of LAURA WALKER
> Sent: Thursday, June 12, 2008 5:21 PM
> To: reflector at tvbf.org
> Subject: REFLECTOR: Vne Revisited
>
> I always get a kick when I read about those questioning Velocity's 200kt
> indicated Vne. For the uninitiated, Vne is ALWAYS based on true airspeed,
> not indicated airspeed. Velocity themselves grudgingly admit that the 200kt
> indicated rule is just a conservative figure to try and keep people from
> hurting themselves. Their own TurboCharlie demonstrator, when advertised at
> 256kts true is actually exceeding their own recommendation by 56kts!!. When
> asked about this, their answer is "well, we never actually go over 200kts
> indicated".  Enough said...for those who have the need for speed, and with
> careful attention to rudder fitment and elevator balancing, the actual Vne
> (true airspeed) of the XL airframe is probably closer to 280 kts.
>
> Bill Walker
>
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