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.

You got it. That is where my engine is relative to firewall, only an
inch or two between the water pump pulley and firewall. You show the rad
farther forward than mine is now. If/when I build the new engine mount,
I plan to move the rad farther forward. As long as I have no reason to
take the engine off I'm going to keep flying. Mike Collier is proceeding
to build the new Long-EZ engine mount design.

Perry


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