His metal and carbon chassis made the weight of caliber the lighest F3C 60 helicoper of that time and maybe now.
I found this Caliber 60 still in perfect condition; after a hard cleaning now is really in like new conditions. I added 3 Futaba S9252 servos. The engine is a classic OS 60 with Futaba GV-1.
I already own another caliber 60 that i have to build, a Caliber 90 Ver 02 with a 06 Head converted in a EP machine and two Caliber M50; one built and one NIB. See the following link for check these machines,