Douglas M-1 / M-2 / M-3 / M-4 (Mailplane)

Mail Aircraft

Douglas M-4 Mailplane Western Air Express NC1475 338 © Karsten Palt
Photo ©: Karsten Palt
The Douglas M-1 / M-2 / M-3 / M-4 is a series of single-engine single-seat mailplanes produced by the US-American manufacturer Douglas Aircraft Company. The M-2 was the first production model.
The Douglas M-series is a development of the Douglas O-2 observation aircraft.
Crew1
Propulsion1 Piston Engine
Engine ModelLiberty L-12
Engine Power298 kW400 hp
max. Cruise Speed178 km/h96 kts
  110 mph
max. Speed (vne)224 km/h121 kts
  139 mph
Service Ceiling5.029 m16.500 ft
Range1.128 km609 NM
701 mi.
Empty Weight1.542 kg3.400 lbs
max. Takeoff Weight2.223 kg4.900 lbs
Wing Span13,56 m44,5 ft
Wing Area38,2 m²411 ft²
Length8,81 m28,9 ft
Height3,07 m10,1 ft
First Flight1925
Production Statusout of production
Total Production57
Developed fromDouglas O-2
VariantsDouglas M-1, M-2, M-3, M-4

[Photo-ID: 10265] © Karsten Palt 2014-05-28
Douglas M-4 Mailplane, Western Air Express, NC1475, c/n 338,© Karsten Palt, 2014Douglas
M-4 Mailplane
Western Air Express
Reg.: NC1475
c/n: 338
 
last existing Douglas Mailplane, displayed as Douglas M-2, NC150, c/n 244
NASM Udvar Hazy Center [Chantilly, VA]
[Photo-ID: 10266] © Karsten Palt 2014-05-28
Douglas M-4 Mailplane, Western Air Express, NC1475, c/n 338,© Karsten Palt, 2014Douglas
M-4 Mailplane
Western Air Express
Reg.: NC1475
c/n: 338
 
last existing Douglas Mailplane, displayed as Douglas M-2, NC150, c/n 244
NASM Udvar Hazy Center [Chantilly, VA]