Boeing Monomail

Boeing · United States · first flew 1930 · transport aircraft

The Boeing Monomail was a revolutionary all-metal low-wing monoplane of 1930 that introduced retractable undercarriage and smooth stressed-skin construction to US commercial aviation, establishing design principles that would shape aircraft for decades.

Recognition (WEFT)

W — Wings	Low-mounted, tapered
E — Engines	1 × piston, nose-mounted
F — Fuselage	12.75 m fuselage
T — Tail	Conventional

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Pioneering all-metal low-wing monoplane airmail carrier
Retractable undercarriage — advanced for 1930
Smooth monocoque skin revolutionary for its era

Distinguished by its clean all-metal low wing, long tapered fuselage, single radial engine cowled with a Townend ring, and retractable main undercarriage — innovations that looked far ahead of their time.

Specifications

The Boeing Monomail has a length of 12.75 m (42 ft).
It has a wingspan of 18 m (59 ft).
Its maximum speed is 254 km/h (158 mph).
Typical crew: 1 pilot + mail/passenger hold.

Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.

History

First flown in May 1930, the Monomail's advanced aerodynamics were actually ahead of the available engine technology — propellers and engines of the era could not exploit its full speed potential. United Air Lines operated a small number of the two production variants.

Variants

Two variants were built: Model 200 (mail only) and Model 221 (mail/passenger combination).

Where you'll see it

Operated briefly by United Air Lines for airmail and limited passenger service in the early 1930s before being retired as faster types entered service.

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