REFLECTOR: HOW FAST? - Flutter

[Ron Brown]

There's a great article in the April 2007 issue of Kitplanes (page 30) in which the author makes the case that it is indeed TAS that we should be worried about when considering flutter.

Ronnie
  ----- Original Message ----- 
  From: Scott Derrick 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Tuesday, March 20, 2007 10:28 AM
  Subject: Re: REFLECTOR: HOW FAST?


  It really depends on what the Vne is a limit for.  

  If for structural load its IAS. 

  If for flutter some of the equation should take into account TAS.  Though I've never seen any real scientific data to support how much should be attributed to TAS vs IAS for flutter. Just OWT's, historical references and he said, she said type of articles like at Vans web site.

  Scott

  Terry Miles wrote: 
Bob,
Just for the record, my understanding is that Vne is better thought of as a
true airspeed limitation.  When GA aircraft in general were no more than 180
hp engines, no effort was spent in calculating indicated versus true.  Now
with 300+ hp engines that can cruise at FL200+ this has to be taken into
account. 

If you wander over to the Van's Website there are a couple of articles there
about the topic in greater depth.
Terry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of bulsr at bellsouth.net
Sent: Monday, March 19, 2007 11:36 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: HOW FAST?

How high were you and what was your indicated A/S? Scott S. I believe
expects to get near 300 TAS at altitude. The Vne of 200 being IAS.
Bob Buls
XLRG
Still building
  From: "Tom Martino" <tmartino at troubleshooter.com>
Date: 2007/03/18 Sun PM 11:22:24 EST
To: "Velocity List" <reflector at tvbf.org>
Subject: REFLECTOR: HOW FAST?

OK, in speed tests this weekend, I was able to true out at 210 knots
pretty consistently.  I was at 23 inches and 2400 RPM.  I still had
throttle travel left.  Flight controls were solid and no sign of
flutter.  Should I push it even further?  At what point do I know I have
gone far enough?  
 
Tom Martino
173 Elite RG - 300 HP (IO-540)
 


    
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