GENERAL NOTES ON THE MOUNTAIN GOAT TANDEM BUSHPLANE
L. A. Fox / FAA DER Flight Test Pilot
Familiarization in the Mountain Goat, tandem, bushplane was conducted in the
vicinity of Palmer, AK, in April, 2005, and included 3 flights at mid to
light weight and mid to forward cg of the proposed envelope.
The technique used to calibrate airspeed indications was valid, although
documentation on the equipment used to calibrate was not verified. A
qualitative assessment of speeds attained in flight, however, revealed a
stall in the vicinity of 30 mph and a cruise speed of over 150 mph. These
estimates were conservative and reveal a maximum to minimum ratio of over 5
to 1. Verifiable instrumentation may, in fact, demonstrate a ratio closer
to 6 to 1.
Level flight stall characteristics at the weight and CG tested were docile
and totally certifiable.
Directional stability at slow speeds was very positive.
Roll control throughout the speed range tested was good.
Landing on and takeoff from a gravel bar with small boulders was comfortable
The engine / fixed-pitch prop combination produced a healthy balance between
cruise and climb.