Wingman wrote:
Tail slides are not generaly regarded as being within the flight envelop as they are part of the post-stall envelop, the document says "practice" at very low speeds to demonstrate flying qualities of the aircraft, 80 kt being sometime "practiced" by some pilots willing to highlight them...
Well the tail slide flown by the Flanker is executed this way:
Pull up to ~80° pitch angle, throttles to idle, decelerating as much until the aircraft stands in the air and starts to fall down at negative speeds before the nose pitches down. The AoA is actually not that high as the aircraft isn't moving forward in the horizontal unlike the cobra manoeuver where the aircraft still flys in the horizontal direction, albeit the tail is showing forward to a certain extend. This is a dynamic manoeuver where the aircraft achieves an AoA ~105° (120° in the Su-27M) just for a brief period of time.
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So is the maneuver of the Flanker, no way on hearh it would spiral at high AoA level flight on TVC, it is too heavy no to sink once on its tail while loosing energy this way.
And we are talking post-stall maneuvers on aerodynamics only in the case of Rafale, which is something of an exeption.
It's a decending spiral around the yaw axis. Or in other words a a controlled flat spin.
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The cobra manoeuver is a pitch manoeuver not a yaw manoeuver, that's the reason why I don't think these manoeuvers are hardly compareable, albeit you might refer to the nose pointing only?
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Nose pointing and time as well btw by "Cobra" read Super-Cobra or "Berkut" because the cobra is only a brief excursion on extreme high AoAs, the idea behind the Berkut was apparently to release AAMs in the rear sector (at least the applicable side of the figure as was explained to us by the russians at the time).
It was therefore a 360* turn vs a 360* rotation aroung the pitch axis.
Berkut? That's actually the by name of the Su-47 FSW demonstrator I think what you refer to is the culbit manoeuver where the aircraft does a loop at around zero speed.
Here a video of the Su-37 demonstrator:
http://www.youtube.com/watch?v=1GdfnTLKcvMYou see the double backflip, cobra and a manoeuver I can't name (cobra plus yaw rotation once the aircraft reaches the vertical)
And here the Su-30MKI:
http://www.youtube.com/watch?v=xY0t_mPv6I4Around 30 sec you see the decending spiral or controlled spin manoeuver.
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In case of problem go to
http://www.ONERA.co.fr and type herbst in the site search engine...
Thanks it worked now.
(rules)
