If you have that flat piece in the engine mount between the
   left and
        right side, then you don't need the x-brace? That appears to be
   another
        evolution in your mount design since I made the attached
   drawings. Mike
        Collier is building this mount design now for his Long-EZ,
   perhaps he
        can consider this modification? The brace to the spar wouldn't
   work in
        my plane, that is where my intake manifold is located.

        The rad you have shown appears smaller than mine, which
   measures 13.5
        inches wide by 17.5 inches long by 3.75 inches thick with the
   two cores.
        Also, I have the engine mounted as close to the firewall as
   possible for
        cg, closer than you show. There is no room to mount the rad
   vertical
        near the firewall. My cg is right on.with 2 batteries in the
   nose and no
        other ballast. I think the Long-EZ firewall is only 16" wide.

        Perry
        http://www.bridgingworlds.com/LEZ13B/LEZ13B.htm

        My mistake. I used 13 by 13. I'll change it to 13.5 by 17.5 and
   move
        the engine
        forward. How far is the pulley from the firewall?

        The lateral brace to the spar can go either side.

        "If you have that flat piece in the engine mount between the
   left and
        right side, then you don't need the x-brace?"

        I don't follow you here Perry.

        Paul Lamar ...No rotor no motor.



   If you look at the 3Ds I sent, I have the X-brace on the bottom of the
   engine mount. Your new 3Ds show a flat beam from left to right near the
   front of the engine, but no X-brace.

   Do I need the X-brace on the bottom and that new vertically oriented
   flat beam at the front?

   Perry

   Yes. The X brace is essential. I'll put it in on the next 3D

   I just had a 3D of the beam lying around and I use it on a lot
   of other designs. So I used it here. If you suck the rubber bushing
   in close
   to the rotor housing you don't need it and can use 1/2 inch alloy plate
   instead. I would specify silicone rubber bushings as the Neoprene tends
   to melt. I saw signs of melting on the hot side of Paul Conner's CCI
   motor mount.
   --
   Here are the changes.


   --
   Paul Lamar ...No rotor no motor.



Being picky here..

Seems like this system ejects very slow moving air - into the propeller
arc.  Maybe there would be ways to improve this - might be tough to keep
it compact and light though.  The merits of the existing system is that
it's simple and light.  I wonder if a louver system would be difficult
to implement.  Maybe just two louvers / cowl flaps..  Might actually
help the cooling too.  Research shows that the back (trailing edge) of
an aerodynamic body isn't [always] the lowest pressure location..


Regards,

Matt-

Some of it is not for sure. Depends on the exact shape.

Paul Lamar

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.