Paul, could you please render a new version of the CH-640
 mount(based on the ch-801, but with a lower rear attach
 from oil pan rear over the nose gear strut), utilizing the
 Doddridge plate, Tracey Cook RD1-C, rear lower oil pan
 vibration stabilizer, etc.  (basically all the features of
 the final version you sent) but move the plate and engine
 out 6" further from the fire wall to accommodate for the
 use of the RB light weight center and end plates?  I spoke
 with Mathieu Heinz when I picked up the wings in Canada,
 discussed the implications of the lighter weight
 installation, and his recommendation was to move everything
 out 6".

 Also could you make notes for me as to the basic
 raw construction materials used, like different tubing
 sizes, IE diameter and wall thickness.  I have both Q-Cad
 and Alibre now, so I should be able to read the cad dwgs
 directly.

  Craig Smith

  snips...

  Preliminary motor mount design.

  One of the unanticipated (by me) side benefits of a light weight 200 pound
  (with PSRU & acc.) 250 HP p-port all aluminum engine moved six inches
  forward in the cowl is more room for the cooling system.

  I would also take advantage of the increased net payload by enlarging
  the fuel tanks for more range. Lots of range is a safety factor as
  you could get somewhere and need to go back because of weather.

  You will also need a 3 blade prop to absorb all this HP.

  This airplane is going to blow a lot of peoples minds.
  Excellent short field performance will be all too obvious.

  Paul Lamar


Two hundred pounds with PRSU and acc. ? Is this accurate Paul, I thought
that was an approximate weight for the light single rotors.

John


Well the bare block two rotor came out to 109 pounds.
There is a picture of Doug holding one at 7 Stock on the
front page of the web site.
I guessed at the rest. 45 pounds PSRU. 7 pounds starter
8 pounds alt., etc., etc..

Poorly educated guess :) Probably not including fluids.

------------------------------------------------------
Craig,

What do you think about bracing the cowl area with a couple
of 1/2 inch 4130 tubes to feed rear motor mount loads
back into the longerons under the gull wing doors?

Just think of it as an extension to the motor mount.

Then I can use this top rear mount scheme.

----------------------------------

Update 640 specs etc.

Paul Lamar