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FLYING A SCHWEIZER 1-35C
The SGS 1-35c is a high performance sailplane that should give pilots many
hours of advanced soaring. The SGS 1-35c is, however, different than other
Schweizer sailplanes in the following respects:
Description:
The SGS 1-35c is a single place fixed gear sailplane with 15 meter wing span.
Glide path control is provided by a landing flap (0-75 degrees), L/D of 36/1
at 55 mph. Minimum sink rate is 2.2 fps at 45 mph.
Experience Required:
Private license with glider rating, 10 hours in a SGS 1-26 or equivalent.
Flight Characteristics:
The SGS 1-35c has very responsive and honest flight characteristics. The
aircraft stalls normally and normal recovery techniques are very effective.
Roll rate is quick and with the ratchet lock trim is a very stable aircraft.
Take-off and Aero-tow:
Aileron effectiveness is less than in a 1-26 or 1-34 during initial
acceleration, therefore care should be taken to avoid dropping a wing. Pitch sensitivity is no more of a
problem than in a 1-26, however PIOs can occur if over controlled by the
pilot. Aerotow is normal however tow
maneuvers should be avoided.
Soaring:
The SGS 1-35c has a very low empty weight and this allows it to climb very
well in weak lift. A flap setting of 0 is recommended while searching and for
centering thermals, and in smooth thermals. To maximize rate of climb in
small or rough thermals use +8 flap setting. Recommended thermaling speeds
are 50-55 mph at 0 flap, and 45-50 at +8 flap. 50 mph seems to feel most
comfortable with slower speeds reserved for very smooth lift. The use
of flaps reduces the stalling speed from 43 mph at 0 flap to 42 mph at +8 in
straight flight. There is very little stall warning at flap settings between
25-75 degrees. Negative flap (-4) is used when flying at speeds over 65 mph.
However flaps must be set to 0 position at speeds above 99 mph. Max glide
speed is 139 mph and maneuvering speed is 88 mph.
The SGS 1-35c is a high performance glider and will glide farther than a
1-26. We recommend 700 ft pattern entry altitude.
Landing:
Landing flaps allow a steeper approach with less airspeed and a slower
landing speed than do dive brakes. Enter downwind with flaps in the 25 degree
detent at 50 mph. This setting gives you the glide ration of a 1-26. Fly a
pattern that looks a bit high and use additional flaps as necessary to
maintain glide path. Final approach should be made at least 50 mph. Do not
(unless necessary) reduce flaps from 25 to 0. If absolutely necessary move
the flaps smoothly to minimize the settling effect. This is not recommended
under 150 feet AGL.
Roll-out can be extended by reducing flaps after touchdown. Use wheel brake
and skid application if necessary to stop. No nose-over tendency exists.
Calistoga Soaring Sept-77.
RETYPED BY TOM RENT 6-99
1-35
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