Scoop-Making

[Wayne Powell]

Just for clarification, the NACA ducts are the ones that were previously
made by PTX; Bolly makes no such beast.  Precision bought the molds from
Peter Thannhauser.  I've got them in my Piorun Medal in the belly pan and on
the nose - should be able to see how well they work this fall.  If nothing
else they really look cool!

Wayne Powell
Bolly Props North America
http://www.BollyProps.com
1-877-WEFLYRC
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Ron Van Putte
  Sent: July 2, 2003 10:00 AM
  To: discussion at nsrca.org
  Subject: Re: Scoop-Making


  John Ferrell described a technique for obtaining air inlets/scoops.  It
looks like fun for people who like new and different adventures in
modelling.  However, I prefer my technique:  contact Mike or Maureen Dunphy
at Precision Aero Composites [phone:(662) 462 5480, e-mail mdunphy at avsia.com
or internet: www.precisionaerocomposites.com] and order a set (3) of their
Bolly NACA inlets.  I plan to use a set on Tony Stillman's new Panacea
design, which Mike and Maureen will market and will also be using a pair of
the Bolly F3A carbon/kevlar wheel pants, which they also sell.

  Ron Van Putte


  John Ferrell wrote:

    If you would like to dabble a bit in a small glass project scoops are an
ideal subject. Just about any epoxy will work well. Check out the spoons
available in housewares (avoid the kitchen drawers unless you are batchelor
or want to be one). You can make the mold using a carved up spoon, play
dough, paper mache,wood scraps, balsa or whatver your imagination will
provide.  I like to hold the stuff together with hot melt glue.Avoid
polyester resin because it will probably get hot enough to melt your mold.
If you don't happen to have any suitable glass fabric, scrap from the rag
bag, or a handkerchief will do...these are not structural parts. Use some
kind of wax for mold release, I like paste floor wax like I use on the table
saw. Try to avoid a wax with silicon, it will be very hard to paint
otherwise. After waxing, spray with with hair spray.

    If your model is not destroyed taking it out of the mold, you spent too
much time on it!

    When you do the lay up, wax the mold at least 3 times, polishing each
time. Spray liberally with hair spray. avoid runs, they will require filling
in the part. When you start the lay up in the mold first paint it with a
thin coat of the epoxy. That will assure a passible finish. It takes longer,
but small scraps of cloth are easier to fit in place without wrinkles. try
to make the fabric cuts at 45 degrees to the threads, it will conform to the
curves easier.

    You don't have much to lose with this size project!

    Fitting the scoops to the fuse:
    Tape sandpaper to the fuse (smooth side down).
    Rub part carefully against the location to be fitted.
    John Ferrell
    6241 Phillippi Rd
    Julian NC 27283
    Phone: (336)685-9606
    johnferrell at earthlink.net
    Dixie Competition Products
    NSRCA 479 AMA 4190  W8CCW
    "My Competition is Not My Enemy"

      ----- Original Message -----
      From: Bob Pastorello
      To: NSRCAMail
      Sent: Wednesday, July 02, 2003 7:22 AM
      Subject: Scoop-Making


      Decided I want to use a scoop on my latest for crankcase/bearing
cooling.  I know where to locate it on the cowl, but have no idea of shape,
angle, if any "ducting" is needed.  It looks like the scoops out there just
direct air based on their shape alone...without ducting.
          Anyone have any suggestions/ideas on this?
          What to make the scoop out of?
          And how to determine what size is "right" ?

      Any insights much appreciated....thanks in advance.

      Bob Pastorello, Oklahoma
      NSRCA 199, IMAC 1320, AMA 46373
      rcaerobob at cox.net
      www.rcaerobats.net




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