The Bauman B-250 Brigadier prototype first flew in June 1947.
The production aircraft were designated Model 290 differed from the B-250 only in having higher power engines. Pilot production commenced in 1951 and the type certificate was received in 1952.
The Piper PA-21 factory designation was applied to a 1949 purchased Baumann B-250 Brigadier NX/N30025 c/n 1 to be used for evaluation. Piper acquired rights with a stipulation agreeing not to manufacture the design, or any variant of it, with pusher engines—Baumann retained those rights. Wings were redesigned for tractor engines in late 1949, but the project was cancelled when completion was judged as financially impractical. The plane went to a local school instead.
B-250
B-290
Engines: 2 x 145 hp Continental C145
Wingspan: 41 ft
Wing area: 207 sq.ft
Length: 27 ft 5 in
Height: 10 ft 4 in
Empty weight: 2150 lb
Loaded weight: 2150 lb
Max speed: 190 mph
Cruise: 165 mph
ROC: 1200 fpm
Seats: 5
All Aero 