B777,
I flew a Cougar for several years using the Golden West Models FD3/67--and it was great! Will be using and selling Wren engines in the near future.
A 12# thrust turbine is more than enough for both the Cougar and Panther. Loads of space for fuel in the Cougar and about 200 sq. in. more wing area than the Panther. The MW-44 (7# thrust) would be ideal for the Panther.
Best regards,
Larry Wolfe
[email protected]