Don´t underestimate the effect of the rotor-systems on each other......
Care to elaborate?
I have seen this done with 2 x MD500, 1 x MD500 + 1 x AS350 and also 2x SA315B.
Two times SA315B placed one fuel barrel on top of another, so accuracy doesn't seem to be an issue.
HNZ, Jim Wilson and Peter Tait - back in the day!!