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Leading edge bracing; was: Kolb Twinstar (original version)

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ceengland7(at)gmail.com
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Posted: Thu Apr 13, 2017 8:05 am Post subject: Leading edge bracing; was: Kolb Twinstar (original version)

John,

You mentioned leading edge bracing. This is all I see in the Twinstar I'm restoring. There's nothing along the rest of the leading edge that triangulates/ braces the leading edge. 

Would you consider this adequate? It's easy to add now, with the cover coming off.

Thanks,

Charlie

Thanks, John. I wasn't sure about how       rugged the tubes would be when driving out mandrels, etc. I use       similar tricks on the heavier experimentals I've owned. I've got a       spring loaded center punch that I ground to a flat nosed, straight       shaft, & use it to punch out driven rivets after drilling the       heads. I also use small, flush cutting 'dykes' (diagonal  wire       cutters) to grab pop rivet heads

       

       On 4/9/2017 5:58 PM, John Hauck wrote:

     

     [quote]       [quote]--> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com> (jhauck(at)elmore.rr.com)  Charlie E/Kolbers:  I have recovered a bunch of them.  All that I tore up and a few I didn't.  Drilling rivets can be accomplished once you have the mandrels removed.  It takes a 1/16" punch, or you can use a pulled mandrel, grind the end flat, hold with vise grips, and knock out with a hammer.  The rivet needs to be held to prevent spinning.  I grind a V in the end of a hack saw blade with sharp beveled edges.  Use that to push up under the rivet to lock it in place while drilling.  4130 airframes should be tube sealed when fabricated.  99% of Kolbs probably have never been tube sealed.  Their builders probably never heard of tube sealing.  4130 rusts from inside out if not sealed.  That would worry me with an old fuselage, especially a Twinstar.  I can't remember exactly what the fuselage looks like other that the root tube that seats and stuff are attached to.  This I would make sure is rust free on the inside.  I helped Brother Jim rebuild Adriel Heisey's Twinstar, Navajo Nation pilot that shot aerial photos published in Nat Geo and other pubs, that he crashed in a wind storm.  It was frightening when we started cutting tubing.  Most were rusted well beyond serviceability.  Here are photos of his Twinstar:    https://uanews.arizona.edu/story/aerial-photos-of-archaeological-sites-on-exhibit-at-state-museum  I don't recall anyone flying a free air cooled Rotax on a Kolb successfully.  Yours may be an exception.  Don't know of any published updates for the Twinstar.  It was not a popular model and kits only produced a couple years.  Strong lateral bracing of the leading edge of the wing is extremely important to me.  Poor/weak lateral bracing can lead to leading edge failure.  This causes the Kolb to stop flying immediately.  Lower tail post bracing makes it last longer.  I don't know a whole lot about the Twinstar.  The one Kolb model I never flew.  john h mkIII Titus, Alabama     --

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Thu Apr 13, 2017 6:17 pm Post subject: Re: Leading edge bracing; was: Kolb Twinstar (original versi

I'm not John, but if you scroll down to page 21 in the MKIII Yellow Book, you will see Dennis Souder's drawing of what Kolb thought to be a very useful reinforcement for the outboard rib. Combined with the bracing you already have, it helps keep the leading edge ribs in column.

http://oh2fly.net/oldpoops/Lexan%20rear%20enclosure.html

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

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