X-Mozilla-Keys:                                                                                 
VMAZDA@aol.com wrote:

Hi Everyone.
I have been on this list for some time and now I really, really need some
info. I have welded (tack) my engine mount and am starting to place the coils
and other parts on the dummy fire wall. When taking some measurements for the
cowl I found a problem with the measurements between the cowl center line and
what I presumed was the center of the air craft engine. I have a difference
of about 1 1/2 inches.

So hear is my question. On the aircraft engine mount, where the mount bolts
to the engine you can draw a line from corner to corner and where the lines
connect in the center I thought that would indicate that this the center of
the engine. Is this right? Or is this only the center of the mounting points
on the engine and that the center of the engine is higher or lower than this
point. 

Yes it can be higher or lower than this point. I was curious about this
myself
and looked at some engines at Pilots Expo. Sure enough some dynafocal
aircraft
engines thrust lines are not necessarily at the center of the X.

I talked to vans a while ago and they did not know. I have set up my
engine to this point but have found that the cowl line which I would assume
would go down the center line of the engine sits up about 1 1/2 inches
higher. I will send a picture of the vans mount. You will see a figure of 4
3/4 inches from the upper left corner of the mount. This is the figure I have
used for centering my engine. Does anyone know the answer to this problem? If
so please let me know.
Thanks

VINCE Hearn
VMAZDA

I would use the cowl as a guide and ignor the stock mount except for 
down and side thrust angles if any. Vans should be able to tell you
these angles.

BTW Vince sent a jpg of the stock RV mount but it was too big to send
out to
you all. JPG's need to be less than 100K for the news letter. Usually
you get
the JPG file size down by scanning the drawing in at a lower rez.

Send us a sketch of your new rotary engine mount for peer review  Vince
if you wish.  If you don't want to scan it mail it to me at 830 E. Santa 
Maria St. Suite 303, Santa Paula CA 93060  

Paul Lamar
 
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