Balencing the blades on CG and such will help alot, but in a crash I dont think its going to make much difference.

1. In a crash, the blades hit the ground, which causes them to swivel in the blade grips. Normally by this time they are'nt spinning fast enough for a properly loaded blade to swing back out, and it strikes the tail.

2. The blades on the blade helicopter will hit the tail boom with no lead/lag. The rotor head has that much play in it in its stock configuration. Coming down the backside of a loop, if you have alot of rear cyclic, and you shove collective into it, you can have so much cyclic in that it will blade strike on the tail.

One of the local guys has stiffened up his head QUITE considerably by adding another o-ring in between the blade grips and the main head. I will probably be doing this to mine also, as it VASTLY improves the heli's responsiveness, and makes it move even quicker.