407 Mainrotor Tracking in General Helicopter Operations Posted August 11, 2011 · Report reply I think we all balance multi-bladed helicopters. Haven't had the honor of working on a single bladed head...Sorry had to take that shot. Agreed on getting involved with dymanic balance by committe. If I have the chance, I'll go off in the corner by myself. Granted the best ride doesn't always come from the blades being in perfect track. The 407 really goes faster if you take the time in the ground and hover runs to get the track within a couple milimeters total spread. They might not end up there at VNE but to not doing it usually causes you to start chasing yout tail.