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Old Jul 04, 2007, 09:39 AM
Allan_A is offline
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Question: how to join 2 pieces of surgical tubing for hi-start


Hi

I am trying to figure out how to safely join 2 pieces of surgical tubing for a hi-start. I was thinking of an eye screw with tie wraps, but I am afraid it will give under the forces.

Any ideas are appreciated.

Allan
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Old Jul 04, 2007, 10:45 AM
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get a piece of wooden dowel that is a little bigger than the i.d. of the tubing. Lube tubing and dowel with soapy water and jam the dowel in as far as you can; 1" to 1 1/2" is sufficient. Measure how far it went in, and cut it off with the same amount sticking out of the tube, then stick the other tubing on the same way. When it's dry, it'll stay. For a connection at the end of the hi-start, use brass tubing. Flatten the protruding end and drill a hole to accept a split ring. This has worked for me for 40 years, no failures.
Old Jul 04, 2007, 10:54 AM
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I have the same problem but what wooden dowel means.I understand that it is of wood but dowel.
Old Jul 04, 2007, 10:56 AM
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Wood works great, however, if you want a two piece


hi start for short launches, use the brass tubing here as well with a nice heavy duty fishing line swivel with clasp.





QUOTE=tonyestep]get a piece of wooden dowel that is a little bigger than the i.d. of the tubing. Lube tubing and dowel with soapy water and jam the dowel in as far as you can; 1" to 1 1/2" is sufficient. Measure how far it went in, and cut it off with the same amount sticking out of the tube, then stick the other tubing on the same way. When it's dry, it'll stay. For a connection at the end of the hi-start, use brass tubing. Flatten the protruding end and drill a hole to accept a split ring. This has worked for me for 40 years, no failures.[/QUOTE]
Last edited by Stan_in_AR; Jul 06, 2007 at 12:57 PM.
Old Jul 04, 2007, 11:22 AM
O.L. Adcock is offline
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I agree but would add to bevel/smooth the ends inserted into the tubing so you don't have a sharp corner/edge......O.L.
Old Jul 04, 2007, 01:08 PM
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I tie the tubing as well as the string, on, with a knot. I am bad with the names of knots, so can't tell you the names of them. This worked back in ott 1 and will in all probability work today.

erich
Old Jul 04, 2007, 01:25 PM
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Quote:
Originally Posted by erich
I tie the tubing as well as the string, on, with a knot. I am bad with the names of knots, so can't tell you the names of them. This worked back in ott 1 and will in all probability work today.

erich

Clove-hitch knot using a key ring works for me. You can add extra tubing or string this way.
Old Jul 04, 2007, 01:29 PM
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Ahhhh...clove hitch...knew it had something to do with spices. The string knot maybe, what people use to call (and maybe still do), a fishermans knot .

erich
Old Jul 04, 2007, 06:05 PM
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Coming from a proud seafaring nation (well before the recent Iraq fiasco at any rate ) I offer you the gift of animated knots by a former world record setting speed sailor.

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Old Jul 05, 2007, 09:08 PM
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Neat web site - Thanks!

John C
Old Jul 06, 2007, 05:32 PM
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I just use electrical ties. Fast, simple, works great. Place the center one first. Stretch the tubes and tighten one on each side. Havenít had failures yet! Take a look!

John
Old Jul 06, 2007, 08:32 PM
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Quote:
Originally Posted by tonyestep
get a piece of wooden dowel that is a little bigger than the i.d. of the tubing. Lube tubing and dowel with soapy water and jam the dowel in as far as you can; 1" to 1 1/2" is sufficient. Measure how far it went in, and cut it off with the same amount sticking out of the tube, then stick the other tubing on the same way. When it's dry, it'll stay. For a connection at the end of the hi-start, use brass tubing. Flatten the protruding end and drill a hole to accept a split ring. This has worked for me for 40 years, no failures.
I use the same system, Tony, and I've never had a problem, either.

As someone mentioned, it's advisable to bevel the sharp corners of the dowel to reduce wear on the surgical tubing. If you're concerned about the tubing staying in place on the dowel or brass tube, you can wick thin CA into the splice.

Jack
Old Jul 06, 2007, 10:18 PM
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I have used loctite blackmax 480 wich is designed for such use.
Old Jul 08, 2007, 06:00 AM
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Hobby Lobby


Quote:
Originally Posted by Allan_A
Hi

I am trying to figure out how to safely join 2 pieces of surgical tubing for a hi-start. I was thinking of an eye screw with tie wraps, but I am afraid it will give under the forces.

Any ideas are appreciated.

Allan

There is this method also

http://www.hobby-lobby.com/histart.htm

Just scroll down to see the aluminum joiners.

Happy Flying
Chip


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