REFLECTOR: HOW FAST? - Flutter

[Alex]

I agree with Doug, but have not read the article so I can't comment on what
the author had to say- anyone have a link to it or something?- maybe I will
go down to Barns and noble and get a copy........

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Douglas Holub
Sent: Thursday, March 22, 2007 8:23 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: HOW FAST? - Flutter


I'm surprised that there's any controversy about this. How to measure the
air speed that causes flutter would seem to be important enough that it
wouldn't be the subject of debate. That article in Kitplanes suggests that
it is widely believed (incorrectly, according to the author) that IAS, not
TAS, causes flutter. Intuitively, IAS makes the most sense to me. Do you
think that a Velocity would exhibit flutter at 400 knots TAS in outer space?
In that case, IAS would be zero.
 
Doug Holub
 
----- Original Message ----- 

From: Ron  <mailto:romott at roadrunner.com> Brown 
To: Velocity Aircraft Owners and Builders  <mailto:reflector at tvbf.org> list 
Sent: Thursday, March 22, 2007 7:12 AM
Subject: Re: REFLECTOR: HOW FAST? - Flutter

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  <mailto:scott at tnstaafl.net> Derrick 
To: Velocity Aircraft Owners and Builders  <mailto:reflector at tvbf.org> 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 Just OWT's, historical references and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"  <mailto:tmartino at troubleshooter.com>
<tmartino at troubleshooter.com>

Date: 2007/03/18 Sun PM 11:22:24 EST

To: "Velocity List"  <mailto:reflector at tvbf.org> <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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-- 



-

    Rightful liberty is unobstructed action according to our will within
limits drawn around us by the equal rights of others. I do not add "within
the limits of the law," because law is often but the tyrant's will, and
always so when it violates the rights of the individual.



    Thomas Jefferson 



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