S T A L K E R, S T A L K E R 2
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A tremendous work has been done. Stalker Rigid Wing has been embodied already.
It was extremely different from existing types owing to a number of advanced design solutions, namely.
- The main thing is control in roll and lateral control through ailerons
as well as pilot's weight shift control. Flying Stalker one has the
same feeling as flying a hang glider. High control efficiency.
- Smooth wing D-spar not covered with dacron. Elementary calculations
show 0.5-0.9 points improvement in glide ratio quality. (See the
chart).
- Rigid specially shaped tip secures minimum inductive resistance within
the wide speed range. A wingtip does not warp in flight, and due to
this the predetermined lateral profile twist angle is preserved at all
flight modes.
- Aileron alignment angle changes in flight, thus reducing power on
the speedbar at high speed. This causes increase in speed range, better
lift-drag ratio at high speed.
- Wing flap and aileron are an extension of a wing profile. There is
absolutely no gaps and steps between them and the wing profile.
This glider possessed all the best characteristics of this type rigid wings:
При этом Stalker обладал всеми лучшими качествами аппаратов своего класса:
- Effective wing flap allowing stable flight even at the speed 25 km/h.
- Rigid wing's weight does not exceed that of a kingpostless hang glider.
- Quick and easy folding into two or one package.
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Results of a prototype flight tests have shown as follows.
The wing is easy-controllable. Adverse yaw has not been detected.
The glider enters and recovers from the turn easily, on the turn it
rotates steadily at any lateral angle
Takeoff and landing are extremely smooth even at complete calm. At
takeoff the wing starts flying immediately, being obedient to the pilot,
and easily reaches takeoff speed. At landing it is necessary to maximally
reduce speed and after this to push the speedbar. The glider will land
at once without nose sinking. Most important is not to push the speedbar
too early.
The wing is quite stable and controllable at towing, it is not difficult
to tow it at bumpiness and to fly with any towing device at speed range
50 - 90 km/h.
Stalker picks up speed very easily, provides a steady flight at high
speed. Efforts on the handle are not big. During testing speed of 130
km/h has been achieved, and this was not the limit. Besides, there were
absolutely no speed bumps. Minimum speed with a completely deflected
flap was 25 km/h.
Minimum sink rate with the flap 10 - 15° was 0.7
m/s. This is almost equal to estimated data (see estimated
polar). Spiral sink rate was 0,9-1 m/s.> |
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Phantom has become a further development of the topic
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