Don Dunbar wrote:

Question
Does any one know what is the optimiun thrust center line for the Cozy
MK4 is?
I asked Nat and the response was to scale it off the outline dwg in the
back cover of the plans booklet, I though this strange as there is no
centerline on the dwg.
What is the position of the  CG  for the 360 Lycoming.
Don Dunbar

Bulent Aliev wrote:

It's WL 21 1/2

Don Dunbar wrote:

Thanks for your answer Greg. it seems strange to me that the designer cant give
these detail's as one would think there is a master plan with all the main
dimension's on. I am having trouble coming to grip's with being told to scale of
the so call dwg in the back of hard cover.
When I complete the Cad 2D dwg I will post it for all to use.
As a naval architect and aluminum shipbuilder I find some of the plan's for home
builds lacking in dimensions and all the templates on three sheets of paper with
no center lines for reference strange.
Don Dunbar

I think that was Bulent and not Greg Don. Puffer wants you to buy the motor
mount so there is no need for a thrust line call out. You drill four
holes in the firewall, bolt on the mount and your thrust line comes out
where he wants it. Experimental aircraft "plans" are not really plans
at all but merely instructions on how to build the airplane using many
off the shelf parts.

Paul Lamar

Don Dunbar wrote:

Bulent  thanks for all your help. I think your right in what you say.
I will continue to put the cozy in cad and make changes as needed.
Earlier today I sent an email to your email address, hoping my question are not
imposing on your time.
I was looking to construct the wing's in a mould as it is an easy job to press the
wing shape in alloy and lay-up the skin, install the ribs and spar the vacuum the
lower skin on.
Is there any one that has constructed the wing's this way.
Has there been wing's constructed with urethane foam instead of the styrofoam that you
know of. It would be easier to spray the urethane into the mould after the skin has
been laid up. The urethane can be sprayed at the same density as the styrofoam.
Don Dunbar

 
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