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Drilling down for Yak-50/52 wing spar failure info

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rsdie_1(at)yahoo.com
Guest

Posted: Mon Oct 29, 2007 6:50 am Post subject: Drilling down for Yak-50/52 wing spar failure info

Folks, 

 



My interest is piqued from the recent banter over Yak-50 wing spar

issues. So my hope is to enlist the collective wisdom so as to provide

actual historical facts on Yak wing spar failures. My belief is this

information will also be relevant to Yak 52 owners as well. Especially early models without the "Heavy spar".

 



Correct me if I wrong, but my understanding is that there were three

Yak 50 aircraft that were lost due to the wing spar failure. These

aircraft were all lost practicing for the World Aerobatic Competition. One

of the pilots got out, and I was told it was a female pilot.I also

believe all of these aircraft were pre-spar mod. Warning! This is a

rumor: I have been told by IMHO, by a respected Yak-50 driver, that one of

these Russian pilots admitted to pulling/pushing far more then the

+9/-6 the aircraft were designed for during this. more in the neighborhood of 14G's positive.So with this said, I

wonder what happened to the design overshoot that was built in. 

 



We all know that we can destroy almost any aircraft by abusing it in

the air. Also with repetitive abuse comes the issue of metal fatigue,well noted.

Nothing lasts forever, and some go sooner rather then later. The Yakovlev engineers found this out with the Yak-50, sooner

then they thought, I suspect. Their response was legendary. My guess

was to save face for the design bureau and country, after the loss of the aerobatic team pilots that were considered national hero's, or at least potential national hero's. The reaction to permanently ground and destroy these aircraft, obviously was viewed as an over reaction my many. BTW was there not a Sukhoi wing failure as well? Was it

something about a cold lamination when the wing was made? 

 



Personally, I have been only involved with the Yak aircraft for less

then 5 years, so needless to say, I still learning. This list is one of

the best tools there is to enhance the experience, and I can not say enough to the people who provide

informative, useful information to this community. For the last three

years or so, I have been enjoying flying the Yak-50, which I bought from

Steve Culp. So I do have a dog in the hunt, so to speak. 

 



So my burning question is, can someone shed actual facts on all the known Yak-50

aircraft that folded their wings? What say you? Victor,

Sergei,Vladimir,Svetlana, any people who know the true facts, please

feel free to educate me. Also I'm curious if there has been any Yak-52 aircraft lost due to wing failure. 

 



Thanks in advance, I value virtually all of the opinions on the list. 

 

Robert Scott Dierolf 



N5203V 79 Yak 50 (79-1503) 



(T31) Aero Country McKinney,TX 



rsdie_1(at)yahoo.com 

 

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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Mon Oct 29, 2007 7:23 am Post subject: Re: Drilling down for Yak-50/52 wing spar failure info

Scott,



Shoot me an email and I will send you some docs that might help in your quest. Some history of the airplane in general...



Tim



TimsMisc ((at)) msn.com

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PeteAbbott(at)aol.com
Guest

Posted: Mon Oct 29, 2007 7:28 am Post subject: Drilling down for Yak-50/52 wing spar failure info

Could you also send this info to me!

  

 Pete Abbott N82GC

  



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