Yeah I thought the G forces might be an issue. On the other hand though, are such large forces really necessary? You'd want a decent amount to get you away from an aircraft that was perhaps in a spin (loss of tail rotor, etc), but I would have thought rather than having high forces for a short length of time, moderate forces for a longer time could also be effective. Especially bearing in mind that helicopters are likely to be travelling much much slower than your average fast jet. Would also solve the problem of having rotor blades flying in all directions at high speed - prob not a good idea if you were flying formation beforehand!
Then again though, I'm sure people have looked into the idea. This is just me thinking aloud!