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Originally Posted by Injecteer
Sure, the Cobra is a fancy way to reduce speed. And that's exactly what you need to fool the Doppler-radar. You don't have to move at 0 kmh, it's enough if you move say not faster than a helicopter.
The Doppler radar function is based on frequency shift of reflected radio-waves: the faster the target AC is moving, the bigger the shift is, and therefore target's speed/position is calculated more accurately.
On the other hand, if target's speed is small, the frequency shift becomes close to the noise level, making the tracing much more inacurate.
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There are other means of mainting lock on a target in the notch ... which may or may not be implemented. If for some reason, whether due to datalink, or other methods, you are still on your opponent's scope and there's a missile coming your way, you just really did ...
not do yourself a favor by slowing down.
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It's a well-known fact, that a hanging helo is not visible to Doppler-radar.
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Oh ... you mean the same way that an F-15E can pick up a heli sitting on the ground from 50nm away, just because the rotor's spinning? Check the source of your 'fact' there ...