I would like some gyan regarding this since my naalij here is about high school physics level. G forces in a turn are dependent on acceleration. Acceleration is rate of change of velocity. If the angular velocity of both objects in the same, shouldn't they both have the same G forces if they are turning at the same rate ? This assumes that the "outer circle" (aircraft) is moving at a much faster speed than the missile (inner circle).
the centrifugal force is the one that we're referring to here as the G-forces. its basically a product of mass and velocity squared, divided by the radius of the circle around which the object revolves. The larger the value of 'r' (the less tight the turn), the lower is the centrifugal acceleration for same mass and velocity. If the angular velocity is to be taken into account, then formula is slightly different- mass*radius of turn * square of angular velocity (since angular velocity is velocity divided by radius of the angle). So if two objects have same angular velocity, and are prescribing a circular path of the same radius, they still may have different centrifugal forces acting on them depending on their mass.
Now if the missile is fired (from inside the circle) at a point where the aircraft is expected to be in a few seconds time, the missile does not even have to suffer those lateral G forces that it would need if it was turning at the same rate as the aircraft. It merely needs to accelerate in a direction which the aircraft will reach in some time.
As long as the missile is inside a circle in which both aircraft and missile are travelling, the missile will not have to experience the same G forces as the aircraft even if the aircraft makes evasive maneuvers. By turning the aircraft is in effect wasting part of its energy in allowing the missile to "catch up", while the missile itself is using all its energy to catch up.
sorry doc, totally lost you here..maybe you could re-explain more clearly calling the enemy as bogey and the fighter that launched the missile as something else.
I would have thought that this is an ideal situation for the missile. Would it not be true to say that the only way for the aircraft to escape would be to concentrate on using all its energy in making the missile do more work (expend more energy). This would be IMO to break away from a turn and start accelerating in a direction away from the missile. At this stage the missile would need its maximum acceleration to catch up and may burn itself out before it does, depending on the initial launch conditions. Also at this stage chaff and flares might help.
As the missile gets closer, a sudden change of direction, such as a Cobra could throw the missile off track because when the missile is closer to the aircraft, it will need to exert a higher G force (and expend energy) to follow the maneuvering target.
the last thing a pilots wants in a situation where he is being chased by a missile is to lose energy and the Cobra basically reduces airspeed to nearly zero. In most cases, it will not result in a missile overshooting the target but finding it to be a rather large, lazy, juicy one. For it to succeed the pilot would need to time it to perfection just a second or two before the missile is to impact.
When a pilot has had some fore-warning about an approaching missile my guess would be that he would first of all try to get into a position where he has plenty of energy to allow for sustained turning without becomng a sitting duck and try to run in the opposite direction so the missile loses energy by the time it reaches him and then any jinking maneuver would be far more successful. that would mean accelerate immediately, and then keep a watch out in the sector from which the missile is approaching.
depending on whether an IR or Active guided missile is fired, things will differ. if its IR, only a MAWS or Eyeball Mk1 will even warn a pilot that something of this sort has happened, which is why IR long-range missiles like the MICA-IR and ASRAAM are dangerous- they are capable of being fired outside of the max. ranges of most MAWS sensors and too far to be seen by naked eye. When an IR missile is fired within WVR, both MAWS and the pilot are likely to spot the missile plume as it leaves the fighter that launched it. within a few seconds of this, the guy will be punching flares, chaff and diving down to try and confuse the seeker against ground clutter. go up into the clear blue sky and you offer a perfect target as most seekers fare better in this condition. using After burner would only increase the fighter's IR signature and may serve to negate the effect of flares although modern IIR seekers like those on the Python 5 or AIM-9X will easily dismiss flares. but the best option is to dive and then alter one's path suddenly and then re-accelerate and again alter the flight path. If you do this from too far out, the missile's will simply be making small energy loss turns with plenty of energy intact. If you do it too late, well it may be too late.
with a BVR missile, the RWR will warn about the sector from which the fighter is being targeted. But even this advantage can be beaten by a tactic that Gripens use- one fighter illuminates the target, then passes on target data via the TIDLS datalink to a "radar silent" Gripen separated by several kms which fires the active guided missile. the targeted fighter's RWR will spot the Gripen that illuminated it, and the pilot will expect the missile to come from this quadrant, consequently doing this best to jam that aircraft's radar while it still has him illuminated. All the while, the missile would be coming from a different quadrant, from a fighter that isn't even radiating and could take the pilot by suprise even as the RWR keeps ringing (although I'd expect this is possible only when the missile's onboard seeker has Locked-on-before-launch). the best way to deal with BVR missiles are fiber optic active towed decoys like the kind the Typhoon and Super Hornet have. Its an area where the IAF will need to invest in for its fighters considering the AMRAAM, SD-10 and possibly MICA coming into PAF service.
I don't know if I even answered any question of yours Shivji. sorry if I didn't.