Subject: Cosman Mark II
From: ACRE NL
Date: 7/4/2001, 9:17 PM


Chris,
What sort of plane is that  again please!?
George (down under)

It's a side by side, 2 seat, low wing, V tail, graphite fiber, speedster
built for really, really, big guys.  Should make the interior of a Lancair
IV look claustrophobic.  Smaller people will probably be able to make it
into a 4 + 1 seater.

You can see the photo history of it at
http://microcosman.com/aircraft/index.html
--
Chris
microcosman.com

Chris - "From a quick shot off a running horse", it loooks like, with the
narrow "V" in the tail, That you might be short on horizontal tail
volume coefficient. Most current thinking on "V" tails set the effective
area as being projected area, and thus would have the same frontal
and skin area as an equivalent conventional tail, for no gain.
Just a nit from the outlying fringes - looks like a neat project, and
the workmanship from the pictures appears to be outstanding.
Vance

You might have a bit less interference drag even though
the wetted area might be the same. There are only four
corners and not six.

BTW Vance do you have that flutter book I mentioned in regard to
the PFA flutter equation? If not I can come over tomorrow and bring it.

Paul Lamar

Paul - No, I do not have that reference, and have not gotten around to
research it further. If you are in the area tommorrow afternoon,(thurs)
Rich and I will be doing our usual thing from about 3 PM to 5,
and would be glad to see you, and maybe Xerox a page or
two if possible. We are also doing some neat things on light
weight wing sections that you might enjoy seeing also
(the six place is going very slowly)(we will also be there
Friday, and it sounds like Mark Kettering may drop by)
Vance

OK BTW Warn Rich that I am going to ask for my stab 
and pitch trim servo back :-)

Paul Lamar
 
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