THIS UNIVERSAL TRAINING UNDERCART SUITS ALL .30 TO .90 ENGINE POWERED HELIS AS WELL AS THE BIGGER ELECTRIC HELICOPTERS. AS EACH LEG IS ANGULATED DOWNWARDS, THE LEGS ACT LIKE A SOFT SPRING, HELPING TO ABSORB THE SHOCK OF ANY ROUGH LANDINGS. THE LEGS ARE ATTACHED BY SUPPLIED RUBBER BANDS, BUT YOU CAN USE CABLE TIES ON THE SKIDS, IF SO DESIRED.