This is a snow, which became both the airtractor
and the thrush. No such thing as thrush 301, though. Airtractor models were/are 301 through to 802. Thrush models all started with S2. The Rockwell Thrush Commander, later the Ayres Turbo thrush, started at 400gal hopper with p&W 1340, and have grown in size since.
This is a bull thrush, had the Wright 1820 in it, 500 gal hopper. Only 2 left in oz, the rest have been converted to turbines.
