Hi, Jerry....I have been reading and watching development of your
universal engine mount jig with great anticipation.  I am hoping you
may be able to help me out.  I am building an SQ2000 (canard pusher
similar to a Cozy or a Velocity). I need have a 1989 13B engine with
the Ross redrive. I have the dimensions for where the mount should
attach to my firewall, and the dimensions from firewall to prop flange,
and the thrust centerline.  What other dimensions would you need, and
does it sound like you might be able to help me with a motor mount?  It
is wonderful to see that you are addressing this "missing link", the
13B motor mount.  Thanks in advance for your reply.  Paul Conner,
Mobile, AL

Hi Paul

  I don't know if I can build a mount to fit the Ross Drive or not.  It
depends on how difficult it is to adapt our motor mount plate to it.
What  is the shaft size  where it goes through  the mmp and the size of
the oil seal?     Please send me all the numbers.   Also, include the
starter diameter where it goes through the MMP.   Another issue will be
how far the mmp stands off from the bell housing.   If this is different
from Tracy's I will need that measurement as well.   Did you receive a
drive adaptor plate with stand-offs with your drive.  If you did, we can
get the numbers from it.

   I think Paul Lamar will provide a plan for the tubing structure. He
has done a number of them already.  I will Cc this to him so that he
knows  what is going on.

    Regards,   Jerry

You could TIG weld 1/2 inch plate elephant ears on the ross bell housing.
If they join the Ross bell housing over an angle of 90 degrees
on each side the shear stress in the weld will be low.

In fact a .75 inch high solid section of plate passing under
the Ross bell housing would take almost all of the high stress.
I'LL do a sketch.  Here it is. Minor breakthrough in standardizing
13B A/C motor mounts if I do say so myself.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site. Copyright 1998-2002 All world wide rights reserved.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org