KTBFFHCFC

You should specify: most two bladed rigid or semi-rigid rotor system helicopters. The danger isn't the maneuver itself, but rather the mast bumping that occurs because of it. In a multi-bladed fully articulated rotor system, it's really not much of a concern. Hell, negative G maneuvers is how OH-58D and AH-64 pilots "gun bump" to engage a target. Abrupt cyclic climb followed by a steep nose-over.

As a dad whose kids love your product, thanks for sticking with it despite the hardships you seem to have had. My children and I’m sure thousands like them have enjoyed the creative playtime that your toy brings.

If you could go back to the start of brain flakes, what would you do differently?