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z601(at)anemicaardvark.co
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 Posted: Tue Jan 06, 2009 11:34 am Post subject: Ground vibration testing |
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According to an article in the latest Kitplanes, the German government
requires ground vibration testing (GVT) before they will approve flight of
kits built in aircraft in Germany.
Assuming this to be true, it would suggest that the Czech version of the 601
has had GVT done. Does anyone know it this might also have been performed on
the US version?
My interest stems from resonance being a possible reason for flutter and other
failure modes. It does not sound as though Zenith has done GVT here. In
fairness, GVT may be impacted by differences in the specifics of changes in
different aircraft. However, it might be worthwhile to know if the basic
aircraft has any problems in this area.
=======================================================================
Jim B. Belcher
BS, MS Physics, math, computer science
A&P/IA
General Radiotelephone Certificate
Retired Aerospace Technical Manager
=======================================================================
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Tue Jan 06, 2009 2:55 pm Post subject: Re: Ground vibration testing |
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While it would be interesting to know what you are asking please keep in mind that the Yuba City report pretty much ruled out flutter in that accident.
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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z601(at)anemicaardvark.co
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| Posted: Tue Jan 06, 2009 3:05 pm Post subject: Ground vibration testing |
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On Tuesday 06 January 2009 16:55, Gig Giacona wrote:
| Quote: |
While it would be interesting to know what you are asking please keep in
mind that the Yuba City report pretty much ruled out flutter in that
accident.
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True. But we may have more than one thing happening to cause accidents. I
still wonder about maintenance of some of the aircraft.
I have a lot of questions .... and very few answers. The Yuba City report
seems to say the aircraft came apart in the air for reasons other than
flutter, yet does not really establish what those reasons are.
That may suggest the reasons are subtile, and not easily determined.
==============================================
Those who can, do. Those who can't, sue.
=================================================
Jim B. Belcher
BS, MS Physics, math, Computer Science
A&P/IA
Instrument Rated Pilot
General Radio Telephone Certificate
=================================================
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Tue Jan 06, 2009 7:13 pm Post subject: Re: Ground vibration testing |
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We may...no strike that...We probably won't ever ever know what happens right before the wings come off unless somebody just happens to have their EFIS recording data or a camera running in the cockpit when an accident happens.
There is another scenario where we could find out what happens. A pilot with a BRS. The problem with even that is that the pilot in question would have every reason in the world to lie if they had been doing something that rips the wings off.
The Yuba City report goes out of its way to NOT rule out the aircraft was over stressed. There are several ways that can happen and not all of them are the pilots fault. That's what I always thought it was and no supportable data has ever been released that counters that position. Is the 601XL as strong as Cessna 172? No but neither is a motorcycle as strong as a Hummer.
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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