Sit over the top of the helo and wait for the right time. Fire down at
him from above. Know your dive recovery limits. High speed isn't
needed unless his air cover is around. 50 cal rain a'coming.
FWIW here's a funy air anti-helo story. I was in the 307th TFS at
Homestead in 1969 when an Army colonel dropped in from Fort Hood. He
wanted some F4s to come out and make unannounced (!) gun passes on
their Hueys. We thought about this for oh maybe ten seconds and then
cautiously asked him if he'd discussed it with the Huey pilots. No, he
hadn't. We said gently that in combat we'd be doing at least 450 knots
in the gun passes and pulling up sharply over them to avoid getting in
their sights (no matter how rudimentary). We also commented that heavy
jets like the F4 churned up a very strong vortex during such a pull-up
and we wondered if that would give their rotor blades any problems. He
left and we never heard any more about that program . . .
Walt BJ