"Lou" wrote

70 lbs is quite a bit difference. Don't be surprised if you have
to move that engine forward for the W&B and to build
a new cowling. Sequoia may not publicly back the idea,
but I wouldn't be surprised if they kept in touch just to see
how it's working. Also everyone involved must remember that
this is an experimental category, so have fun experimenting.

I agree, and also be thinking about the changes a cowl further forward will
change the aerodynamics.

I would think an aerodynamicist would recommend adding some area to the
vertical and horizontal stabilizer, by adding some width and height, or
other profile changes, or extending the length of the fuselage to get a
longer tail moment arms.

I think the Falco probably is designed with the tail areas at close to
minimum areas to maximize performance. If there is area added in front of
the center of pressure, and not compensated with changes behind the center,
you will definitely become a test pilot in another critical way.
--
Jim in NC