Rusty,
You could run a piece of 3/8” copper
tubing through the inside before adding the sand. The copper tubing would help
the inner tube to hold the proper shape yet be flexible enough to remove after
cure.
Mark S.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Russell Duffy
Sent: Monday, April 11, 2005 7:54
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: SQ2000
flying again
Did you see Richard
Sohn's trick for making a fiberglass tube at Shady Bend? Basically you overfill
a section of an inner tube with sand. Once filled you can bend and shape it.
Glass it. Remove the sand. Peel out the inner tube. Bingo. A perfectly smooth
fiberglass duct of the correct dimensions and shape.
I heard about that, or read it somewhere,
but never got around to trying it. Seems like it would need to
be attached in place on the engine to make sure it was in the proper
shape, but I don't have room to work around all the other stuff to try to glass
it there.
Now I could fill the hose with Sakrete and
sand, then put some water in it before putting it in place. Once
hardened, you could take it away, and glass it on the bench. Of course
you'd have to put a couple layers on, then cut it apart to get it off the
concrete tube, but you could easily put another layer on it go glue it back
together.
Maybe I'll just keep putting this off :-)