N Atlas Trinity PD5000 Covered Hopper Grace Davison [NAHX] #550171 - 50005679 OPT racing seats

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Bell began the development of an attack helicopter for air support of troops

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N Atlas Trinity PD5000 Covered Hopper Grace Davison [NAHX] #550171 - 50005679 OPT racing seatsThe Pressure Differential, or PD covered hopper was designed as a competitor to the General American Transportation Airslide hopper in the early 1970s to transport light, powdered materials. Unlike the Airslide, which forced pressurized air up through a fabric liner to help fluidize the cargo, the PS series of hoppers applied both a positive pressure of about 15 lbs. psi above the outlets as well as a vacuum at the outlet to help draw the cargo from