Paul,

All the X & Y dimensions are from the flat firewall. Note there are five mounting points. Designer call for up to 180hp
with the four point, with up to 260hp with five points.

I'm trying to get an idea of the room using either a 13B or 20B. Only one Bearhawk is flying (Elden Yates). Little
details, but Elden ended up putting his battery next to the PSRU to get some weight out on the nose!

Plan is to use Tracy Cooks PSRU. With 180hp, Bearhawk cruise is 140mph, with 260hp it is at 160 mph (75% on both
numbers).

--Tom

There are five mounting points on the Bearhawk Firewall. Firewall is
approximately 2" larger at all mounting points.

In Inches: X Y
Lower Left 3.500 0.000 reference
Lower Right 31.188 0.000
Upper Left 0.000 20.188
Upper Right 34.688 20.188
Upper Middle 17.344 24.844

THRUST LINE 17.344 15.844 Firewall set back at 6 degrees (top towards tail).

Prop Flange (front edge) to VERTICAL MOUNT - 40.625"
Note, from firewall (6 degree lean back - top towards tail) is sin 6 *
(Thrust Y position) or an additional 1.656"

-- end of email ---


Does this look right?

Now you want me to lay it back 6 degrees?

Paul Lamar

Paul,

I would like to know what you come up with for the Bearhawk
as this is the route I intend to go - Bearhawk with a 13B.

Engine and mount first of course ;)

Wade

Sure no problem. Say hello to Bob for me.
Send me his email address and I will copy him the dwgs.


Paul Lamar