The HP-9 was intended to fly in the Standard
Class at the 1960 World Championships, but was
not completed in time. It has an all-moving
horizontal tail, retractable wheel, airbrakes
and Fowler flaps which increase the wing area to
13.35 m./ 143.7 when extended, reducing the sink
to 0.64 m/s/ 2.11 fps./ 1.25 kt. @ 76 kph/ 41
kt/ 47 mph.
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