Oh, glad you brought that up, Jessie. Just
in case - DON’T BURN URETHANE in any way shape or form - Or try to cut
it with a hot wire. When burned it produces a poisonous gas. If your project
was a foam/composite airplane you’d know that – but if you’ve
been working on an RV this may not have come up in your “education
section”.
Joe Hull
Cozy Mk-IV #991 (preping for DAR inspection
- details, details)
Redmond (Seattle),
Washington
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of jesse farr
Sent: Friday, December 16, 2005
7:07 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: cowl
I used to buy 4' x 8' sheets of urethane that came in
2" and 4" thickness. It was used for ceiling and wall construction in
freezers. I have seen thicker blocks of the stuff. It was also available as
pouring, moulding and mix and spray material. It should still be available. It
was fairly large celled, real brittle, as the man said, cut and formed rather
easily; but, had almost no strength. It also was flamable as heck. Took
to being painted with latex and sheetrock topping mixture real well. This sanded
almost as easy as the foam.
----- Original Message -----
Sent: Thursday, December
15, 2005 5:41 PM
Subject: [FlyRotary] Re:
cowl
If you really want to make quick work of
shaping your cowl get some Urethane foam from you local roofing supplier or
florist (used in the bottom of vases to hold flowers). It’s a really
light weight and brittle foam that you can sand my just looking at it (well
almost). It can be shaped really quickly – but you need to be really
careful with hitting or touching it – it dings really, really easily.
Also, duct tape won’t stick to it so you do have to fill the finished
shape with Micro or plaster / drywall mud and then sand that smooth and paint
for release before fiberglassing.