Haven't been active on this list for a while but I'm still working on my design and
doing rough layouts of the firewall forward package and was wondering what the
minimum distance should be between the lower motor mounts?

I originally designed the plane around the Corvair and bought William Wynns
conversion manual and used the dimensions he specified (the reason for the funky
numbers is that so much has been done since then that things have creeped a little)
to design the mount.  Now that i want to use the 13B I was wondering about the lower
dimension since the upper is pretty much set by the width of the fuselage at the
longerons.

Thanks,

Will

You want all the motor mount hard points on the firewall as far apart as possible.

Ideally as close to the fuselage skin as possible. That distributes the stress into
the structure better.

Also read   http://www.rotaryeng.net/mm-instruct.html

Paul Lamar   		 	   		

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