sentences:  When on the ground, the tail rotor folded against the tail to avoid being damaged during loading.The wing could be rotated to 100 degrees, past vertical, in order to hover in a tailwind.The C-142 was powered by four General Electric T64 turboshaft engines cross-linked on a common driveshaft, which eliminated engine-out asymmetric thrust problems during V/STOL operations, to drive four Hamilton Standard fiberglass propellers.