85% completed, 85% remaining
$3500 ( Eagan, Minnesota 55121) posted by Fred Hewitt (1) on 03/23/2017
Stopped working on the sailplane
when I converted my workshop into a lighting laboratory. At age 88 I have too
many projects and need to do some pruning.
The American Falcon was designed
by Tor Jensen. The aircraft is made predominantly from fiberglass sandwiches,
with the wing spar made from carbon-fiber-reinforced polymer. The central
structure is made from welded steel tube. The cockpit is reinforced with Aramid.
It has a 49.2 foot wing span with removable optional extensions that brings the
span to 59.2 feet. Glidepath control is via full span trailing edge flaps,
coupled with top surface Schempp-Hirth-style airbrakes. The flaps can be set to
+15°, +10°, +5°, 0°, and -5° in flight. The cockpit was designed to accommodate
a pilot of up to 76 inch in height and weighing up to 260 lb. with
parachute. The landing gear is a retractable monowheel. Empty weight is 580 lb.
Stall speed is 38 mph with flaps in landing configuration. Maximum glide
ratio is 44:1.
The horizontal tail is completed
and fitted to the vertical fin. The two fuselage halves have been assembled and
bonded to the central tubing frame. The wings are finished except for holes in
the spar ends which are held together with a large pin. Just before I joined
the top wing surfaces to the bottom wing surfaces, a modification was issued
for re-enforcing the spar near its root. If the wing surfaces were already
assembled, holes needed to be cut in bottom wing skin in order to make this
modification. Since I had not yet assembled the wings, the modification was
made and easily and better.
The Falcon has a control “mixer” which links the aileron function with the
flap function. The purpose of the mixer is (a) to provide full-span
proportional ailerons, with the inboard flap section deflecting about 40% of
the outboard aileron’s movement, and (b) to provide full-span flaps, with both
the aileron and flap moving up and down together equally. The mixer is
completed and installed. I modified the mixer so that its motion is reversed. I
did so because the control rod from the flap handle to the mixer was not
straight but considerably contorted. Now a straight control rod can be used,
but a reversing lever must be located to correct the direction of the flaps and
aileron. I was designing this
reversing level when I stopped working on the sailplane. The nose tow hook is
installed and many of the cockpit area parts have been fabricated. I have not
started on the wing tip extensions. I have a construction log and a large
number of photos that record the construction progress. There is
some water and moisture damage that occurred during storage so some small parts
will need to be replaced. The parts are presently in my crowded orkshop. I have
not cataloged the collection but it appears that there should not be many
missing parts. There is no trailer. The sailplane parts collection is located
in Eagan, Minnesota. Payment when the sailplane parts are picked up. I have
decided on an asking price of $3,500.
Fred Hewitt 651-454-2115 email@example.com
Pictures at: https://ultracruiser.smugmug.com/American-Falcon/n-KMHxQV/Project/