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Any known Kolb in flight structural failures

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John H Murphy

Joined: 03 Jan 2007
Posts: 78
Location: Henderson, NV

Posted: Tue Dec 25, 2007 10:04 am Post subject: Any known Kolb in flight structural failures

Has there ever been a reported structural failure of a Kolb in flight? The kind of structural failure such as a collapsed wing, struts, boom, cage or tail feathers?

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Tue Dec 25, 2007 5:00 pm Post subject: Any known Kolb in flight structural failures

At 01:04 PM 12/25/2007, John H Murphy wrote:



 	  Quote: 	
		  Has there ever been a reported structural failure of a Kolb in flight? The 

kind of structural failure such as a collapsed wing, struts, boom, cage or 

tail feathers?


	


Others could answer better than I, who've only been here about a year, but 

since nobody else has responded, there are three I've heard of:  An 

Ultrastar deliberately tested to destruction at around 6 g's (the wing drag 

strut failed, the pilot successfully deployed a parachute, and Kolb 

subsequently strengthened that area), and two wing leading edge failures on 

early Firestars that were also flown very hard (one pilot rode the chute 

down and lived to tell about it, the other didn't.)  Search the list 

archives and you'll find the discussions.



-Dana

--

  "640K of computer memory ought to be enough for anybody." - Bill Gates, 1981

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slyck(at)frontiernet.net
Guest

Posted: Tue Dec 25, 2007 6:13 pm Post subject: Any known Kolb in flight structural failures

You have to be gentle with the flight controls if you use all Harbor  

Fright hardware.

BB

do not archive

On 25, Dec 2007, at 7:54 PM, Dana Hague wrote:



 	  Quote: 	
		   



 At 01:04 PM 12/25/2007, John H Murphy wrote:



> Has there ever been a reported structural failure of a Kolb in  

> flight? The kind of structural failure such as a collapsed wing,  

> struts, boom, cage or tail feathers?



 Others could answer better than I, who've only been here about a  

 year, but since nobody else has responded, there are three I've  

 heard of:  An Ultrastar deliberately tested to destruction at  

 around 6 g's (the wing drag strut failed, the pilot successfully  

 deployed a parachute, and Kolb subsequently strengthened that  

 area), and two wing leading edge failures on early Firestars that  

 were also flown very hard (one pilot rode the chute down and lived  

 to tell about it, the other didn't.)  Search the list archives and  

 you'll find the discussions.



 -Dana

 --

  "640K of computer memory ought to be enough for anybody." - Bill  

 Gates, 1981

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Tue Dec 25, 2007 7:33 pm Post subject: Re: Any known Kolb in flight structural failures

There was a recent case on a MK III where the front of the tail attach point fatigued, cracked, and failed in flight.  The front of one side of the horizontal stabilizer went straight up, and jammed against the tail wire, being flat into the wind.  The rest of the tail stayed together and the pilot flew it to a safe landing under control.



I also read of a very old case where a guy flew a MK II in Canada in very extreme turbulence, and a weld on the rear wing attach failed.  The quality of the welding was fixed many years ago according to the article.   



As far as structure, the Kolbs have a very good structrual record compared to most other airplanes of its class.  Except for the first case with the tail, Almost every failure ever recorded was caused by abuse far in excess for which the planes were designed.  Aerobatics, etc. etc...    Kolbs have a good reputation for being strong planes.



Mike

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_________________
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Kolb MK-III Xtra, 912-S

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