Connecting ducts between {TAIL ~ gas cushions} can include venturis that restrict pressure pulses in {HEAD ~ one gas cushion} from traveling to another gas cushion 
Connecting ducts between { TAIL ~ gas cushions } can include venturis that restrict pressure pulses in { HEAD ~ one gas cushion } from traveling to another gas cushion
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH