----- Original Message -----
    From: Russell Duffy <mailto:13brv3@bellsouth.net>
    To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
    Sent: Monday, April 11, 2005 5:53 AM
    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.           Hi John,
         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 :-)
         Cheers,
    Rusty
         I have to clarify some thing on the fiberglass mold.
    I made a plug out of styro foam and painted it with water base
    Latex until it was smooth. When it was dry I coated it with mold
    release(PVA) and than wrapped the fiberglass around. I am using
    mostly VE for the convenience vs Epoxy. So I have to be careful
    not to expose the foam to the resin. When it is cured, I heat the
    whole thing with a heat gun until the foam shrinks and takes the
    Latex with it. I is getting small and soft enough to just fall out
    of the FG with the inner surface as smooth as the plug was to
    begin with, and no mess with gas and melted foam.
         Richard Sohn
    N-2071U