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Jul 04, 2007, 08:39 AM
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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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Jul 04, 2007, 09:45 AM
Yep, Naza-controlled Tricopter
tonyestep's Avatar
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.
Jul 04, 2007, 09:54 AM
Registered User
I have the same problem but what wooden dowel means.I understand that it is of wood but dowel.
Jul 04, 2007, 09:56 AM
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Stan_in_AR's Avatar

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 11:57 AM.
Jul 04, 2007, 10:22 AM
AMA 7696
O.L. Adcock's Avatar
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.
Jul 04, 2007, 12:08 PM
Registered User
erich's Avatar
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
Jul 04, 2007, 12:25 PM
Air Crash Expert
sawman's Avatar
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.
Jul 04, 2007, 12:29 PM
Registered User
erich's Avatar
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
Jul 04, 2007, 05:05 PM
Biting ankles since '53
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.

Knots
Last edited by mr_editor; Jul 06, 2007 at 02:09 AM.
Jul 05, 2007, 08:08 PM
Registered User
Neat web site - Thanks!

John C
Jul 06, 2007, 04:32 PM
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jrgospod's Avatar
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
Jul 06, 2007, 07:32 PM
My dog can sense lift
UnkyJack's Avatar
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
Jul 06, 2007, 09:18 PM
Good Better Best quest.
olmod's Avatar
I have used loctite blackmax 480 wich is designed for such use.
Jul 08, 2007, 05:00 AM
Surf's up!!
sixty9mustang's Avatar

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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