Not bad aircraft does not exist. One that flies perfectly on the highest speed, bad for small, and vice versa. If the wings do bolshennymi, the machine shoots and sits without problems even without wing mechanization, but resistance in flight enormous. If they do malehankih, the landing will take place at speeds of «over 300 km / h», reclaims good longish airfield and runway. And efficiency is … Why, it would be shameful and cost call.
In a word, the arrow flying further, faster and stone, while the aircraft should be further and faster. To overcome the age-old problem of «dray horse or timid doe,» NASA is going to finance the development of the aircraft, taking off his nose, and for the transition to supersonic unfolding ahead … sideways.
We have dubbed this scheme «push-pull», right behind the famous «animal.» But the scheme with the title had already been used before and during the second World War, and of the analogy is not quite clear: it is not only move astern, but only sideways.
Project SbiDir-FW (Supersonic Bi-directional Flying Wing, «supersonic flying wing with variable direction of flight») proposed by the developer of the NASA Institute of Miami (USA), — very smartest attempt to solve this prepyadstviya. We have before us a flying wing, designed for economical far subsonic speed. And if you deploy the same LA 90?, Then in front of us with a decent flying wing supersonic aerodynamics and low resistance. First subsistence form closer to the bird, and the second — to the cruise missile, and the supersonic. During the reverse transformation of the narrow-LK supersonic fuselage when turning flows naturally thicker in the profile with a wing aerodynamic highest quality and, consequently, cost. The unique shape of LC in passing the sound barrier should be virtually no sonic boom …
At the request of the lead developer of the project Ge Cheng Zha, preliminary calculations show that the speeds of M1, M2 and 6 aircraft in the configuration of a business jet will have a glide ratio equal to 16! For comparison, it may be recalled that the MiG-25 on the M1, 5 had AK, equal to only 4.2, and even passenger «Concord» M2 demonstrated on aerodynamic efficiency only 7.16 — «at times» worse! This is so far from the data of the absolute majority of supersonic aircraft that nobody asks for explanation.
Obviously the main achieve this helps a small load on the wing, in comparison with the above machines form is not a «flying wing». But itself for itself, this factor failed to ensure success: after that great accelerate subsonic, yes even just sit or soar, wing profile would make thicker, which would not allow to achieve low drag at supersonic speed. So if calculations were done correctly before us sensational on its comparative advantage concept aircraft.
Recall: the idea of aircraft with variable geometry wing far is not new, but its implementation had severe shortcomings. Not counting the wing, in the transition from subsonic to supersonic need to change a lot of things, but this is not so simple as to change its angle of sweep. With variable geometry wing always from the very own appearance on R.1101 Messerschmitt was a compromise, dramatically increases the cost of the machine (because of the progressive complication of mechanization and hydraulic systems), not to mention it constructively greater weight in comparison with the ordinary. So that the dignity of the machine, which is not necessary «to move the wings» in flight for a complete change of aerodynamic form (for example, with the change of the wing chord), in general, are obvious.
The reader, of course, have wondered how this mysterious happens, the criteria for significant flight speeds, the transition from forward flight to «fly sideways» from subsonic to supersonic and opposite?
But ah well. Wingtips — they are the only moving part in the proposed concept — simply rectified by providing turn the whole machine 90?. It is clear that «just» it is only in words but in practice is still required to prove the absence of a threat from the wing stall with appropriate sad consequences and other flat spin. Transition from supersonic to subsonic regime provided, as you already guessed, folding wingtips, automatically leading to a reversal machine sideways. Here comes another question: what will happen when the transitional regime, when the aircraft has not lost speed, and his nose and feed him at one point begin to rise? Do not start problems with stability on the course? How to deal with turning engines in flight? The creator of the concept proves that all calculated and problems will not. Everything will be something like:
What a shame it did not sound, we did not find, together with him, although some solutions to the problem, of course, imposed themselves. Alignment of the way (on the assurances Ge Cheng Zha), designed so that the plane will be stable both in the forward and lateral flight.
In general, the concept looks promising: the highest rate of M1 ,6-2, and 0 (1 720-2 400 km / h); the almost complete absence of sonic boom allows soar and land on ground airfields of any country (in almost all regions of the world crossing the sound barrier on land is forbidden); low wing loading and its thick profile allow takeoff from strips least 750 m in length (close to that of some massive fighter second world) — with seating capacity up to 70 people.
NASA has already allocated $ 100 thousand design team, which seemed to be enough to bring the project to purge step model in a wind tunnel. If you find that a 90? is not a problem, then promised another $ 500 thousand — for subsequent finishing. Naturally, this is not enough for full-scale implementation of the project, but something gives us a hint that if it will fly, then from those who want to finance flying sideways plane will have to fight back. Very much significant potential merit «vserezhimnym aircraft.» Very optimistic and the developer himself.