"Thanks for your inquiry.  I would (will) use two pins for the bottom cowl
on my Lancair IV, but will make them long so that they protrude when
inserted from the bottom 6 or 8 inches into the lower portion of the upper
cowl to the point where they just begin to get into the tight radius as the
cowling starts to turn to horizontal."  
"Then I will either design a sandwich slot for the top back portion of the
upper cowl (much like the forward attachment for the flap mounting hardware
access covers on the rear of the wing in the IV)."

Do you have a photo of this?


"The other option I am considering but is my second choice is to add a third
pin - but not a fourth - that would retain the rear section of the upper
cowl along its horizontal portion.  This pin would not have to turn any
sharp corners but would have to insert within a long filleted approach at a
low angle."

Does this mean it is better to insert the pin in a location with more radius
rather than the flatter top center of the cowl that would require two upper
pins?


"In terms of ease of use, the Carbinge will make the necessary curves.
Virtually any turn you can make in aluminum without distorting the metal you
can do with Carbinge.  With regard to pin insertion, we have had two or
maybe three customers who have had difficulty with too much friction.   We
have developed smaller diameter pins and we keep some on hand.  If you are
having trouble with the standard size pin, we trade them out.  You return
the standard pin to me undamaged, and I send you a replacement with a
smaller diameter.  We have them with Keepers already attached, so you don't
have to wait for us to make them up.  Obviously, we want the pins to be as
tight as possible while still being manageable, so we ask you to try the
standard pin first, then we'll switch them out only if the problem occurs."

If the smaller diameter pins are used to make it easier to insert them, does
the cowl move or shift position?  I understand it would reduce the strength
but since Carbinge is so much stronger than other attachments would it still
have an adequate safety margin?

Steve Colwell   Legacy

 
John,

Will Carbinge Keeper Pins turn the radius of a Legacy or IV Cowl to Fuselage
attach using Carbinge?   If so, will 2 Pins for the bottom cowl and 2 Pins
for the top cowl usually suffice?  Where would the recommended entrance
points be located?  Is it a struggle to insert the Pins?

Steve Colwell    Legacy in the sanding stage




Subject: [LML] Re: Brakes and Live Locks

Posted for "John Barrett" <2thman@cablespeed.com>:

  Hinges for cowling - get rid of the ugly little blemishes and save a hell
of
  a lot of money. At the same time you get a better fit and attachment (by
  spreading the forces all the way across the junction of the two parts)!

  Another shameless plug for Carbinge graphite hinges.


John Barrett
Barrett/Garrett Enterprises, Inc.
PO Box 428
Pt. Hadlock, WA 98339
www.carbinge.com