The current rotary engine firewall forward weight is the same > as a > Lycoming O-320 or

O-360.

Most people would have an aft CG problem > at a firewall forward of 250 pounds with a

stock cowl

and prop position. > One would have to move the engine way forward to get the CG in the >

right

place. If you moved the engine aft in a canard you might > get a prop strike on flare or

takeoff.

Paul Lamar What is difference in CG position compared to an O320 (ballpark estimate)? I

plan on

mounting as close to the firewall as I can get and still leave room for accessories and
maintenance access. This is both to avoid the prop strike in my LongEZ, and to allow me to

move

the battery weight from the nose to the back.

I think I will let others answer that question as it seems to vary

>from installation to installation. Perry's set up is real heavy as he

is using a real flywheel, cast iron exhaust manifold and stock
intake manifold.

Paul Lamar

I don't have any numbers to offer from memory.  Yes my engine
installation is probably overweight by at least 75 lbs.
I don't have a cg problem. Engine is mounted as close to the
firewall as practical.  With two batteries and a weather radar
in the nose, no cg problem. I can get a number for you if you
wish, distance from firewall to a point on the front of the
engine.
My weight/power condition means it is really only a single
person airplane for long cross-countries when carrying full
fuel.  I have taken my 10 year old son on long trips with
as much stuff as I can cram in.
My fan is closer to the firewall than a standard LEZ prop by
a few inches I believe.  Prop strike not a concern for me
(just joking).

Perry

 
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