John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Sun Apr 16, 2017 3:47 pm Post subject: Leading edge bracing; was: Kolb Twinstar (original version) |
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I left out the fact that the fabric braces are on the nose of the inboard rib. Aft is 4130 and nose is alum tubing.
john h
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of John Hauck
Sent: Sunday, April 16, 2017 5:36 PM
To: kolb-list(at)matronics.com
Subject: RE: Leading edge bracing; was: Kolb Twinstar (original version) info request
Actually, the two 5/16" tubes are fabric braces to keep the fabric from pulling the aluminum rib nose inward. There is no lateral bracing of the leading edge tube except a long 5/16 alum tube that is in compression.
The bow tip doesn't do much for lateral bracing of the leading edge tube. That's all you have to keep the rib noses in column. Once they get pulled out of column, they will probably fail.
The small 5/16 tubes are flattened, bent, and riveted. They tend to break at this point from vibration with not a whole lot of time on them.
I used two 1/2" alum tubes, one inboard and one outboard, diagonally working with each other, attached to the leading edge tube and the main spare. Wish I had a photo of my wing handy. If I can find one I will share it.
I may be overly cautious, but it makes me feel more comfortable, especially when I get caught in extremely rough air.
Sorry for the delay in responding. Just got home from a 4 day trip.
If you need more info, call me. 334-567-6280
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server(at)matronics.com (owner-kolb-list-server(at)matronics.com) [mailto:owner-kolb-list-server(at)matronics.com (owner-kolb-list-server(at)matronics.com)] On Behalf Of Charlie England
Sent: Thursday, April 13, 2017 11:05 AM
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Subject: Leading edge bracing; was: Kolb Twinstar (original version) info request
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. |
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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