N Atlas Trinity PD5000 Covered Hopper Grace Davison [NAHX] #550145 - 50005678 Self-Propelled Gun 200 in number by the

200 in number by the end of World War II

the single-seat delta-wing VF-0C was re-approved for development due to strong demand from the Marine Corps

After extensively testing five prototypes in 1933

It is primarily used for light attack or multi-role tasks

since it derived from the previous model M3 “Grant”

N Atlas Trinity PD5000 Covered Hopper Grace Davison [NAHX] #550145 - 50005678 Self-Propelled Gun 200 in number by theThe 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