Boeing Monomail

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Model 200 and 221 Monomail
Model 200
General information
Type	Airliner
National origin	United States
Manufacturer	Boeing
Status	Retired
Primary user	United Airlines
Number built	1 Model 200 1 Model 221
History
First flight	6 May 1930
Retired	1933
Developed into	Boeing YB-9

The Boeing Model 200 Monomail was an American mail plane of the early 1930s.

Design and development

The aircraft marked a departure from the traditional biplane configuration for a transport aircraft, instead featuring a single, low set, all metal cantilever wing. Retractable landing gear and a streamlined fuselage added to the aerodynamic efficiency of the aircraft. A single example was constructed for evaluation by both Boeing and the US Army (under the designation Y1C-18) but no mass production ensued, and the aircraft eventually joined Boeing's fleet on the San Francisco-Chicago air mail route from July 1931.

A second version was developed as the Model 221, with a fuselage stretched by 8 inches (20 cm) that sacrificed some of its cargo capacity to carry six passengers in an enclosed cabin; the single pilot, however, sat in an open cockpit. This version first flew on 18 August 1930. Both the Model 200 and the Model 221 were eventually modified for transcontinental service as the Model 221A, with slight fuselage stretches to give both a cabin for eight passengers. These aircraft were flown on United Air Lines' Cheyenne-Chicago route.

The advanced design of the Monomail was hampered by the lack of suitable engine and propeller technology. By the time variable-pitch propellers and more powerful engines were available, the design had been surpassed by multi-engined aircraft, including Boeing's own 247. However, many advancements of the Monomail were incorporated into the designs of the most advanced bomber and fighter aircraft of the early 1930s, the Boeing B-9 and the Model 248 (later developed into the P-26 Peashooter of the USAAC), respectively.

Variants

Model 200: mailplane (1 built)
Model 221: mailplane with capacity for 6 passengers (1 built)
Model 221A: Model 200 and 221 converted as 8-passenger airliners
Model 231: Planned lengthened version of Model 221, not built.

Operators

United States

Specifications (Model 221)

General characteristics

Crew: One pilot
Capacity: 6 passengers
Length: 42 ft 0 in (12.75 m)
Wingspan: 59 ft 0 in (18 m)
Airfoil: Boeing 106
Gross weight: 8,000 lb (3,629 kg)
Powerplant: 1 × Pratt & Whitney R-1860 Hornet B radial engine, 575 hp (428.8 kW)
Propellers: 2-bladed

Performance

Maximum speed: 158 mph (254 km/h, 137 kn)
Cruise speed: 135 mph (217 km/h, 117 kn)
Range: 575 mi (925 km, 500 nmi)
Service ceiling: 14,700 ft (4,480.5 m)

References

Boeing History - Boeing Monomail Transport Retrieved June 17, 2006.
Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
World Aircraft Information Files. London: Bright Star Publishing.

External links

Wikimedia Commons has media related to Boeing Monomail.

Boeing airliners and civil aircraft

Airliners

Piston-engined	40 80 221 Monomail 247 307 Stratoliner 314 Clipper 377 Stratocruiser
Jet-engined	367-80 707/720 717 727 737 737 Classic 737 NG 737 MAX 747 747SP 747-400 Dreamlifter 747-8 757 767 777 787 Boeing Business Jet
In development	777X
Proposed	Y1 Y3 New Midsize Airplane
Not developed	2707 7J7 New Large Airplane Sonic Cruiser

Civil trainers/
utility aircraft

v t e United States military transport aircraft designations, Army/Air Force and Tri-Service systems
Army/Air Force sequence (1925–1962)	C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 C-9 C-10 C-11 C-12 C-13¹ C-14 C-15 C-16 C-17 C-18 C-19 C-20 C-21 C-22 C-23 C-24 C-25 C-26 C-27 C-28 C-29 C-30 C-31 C-32 C-33 C-34 C-35 C-36 C-37 C-38 C-39 C-40 C-41 C-41A C-42 C-43 C-44 C-45 C-46 C-47 C-47F C-47T AC-47 C-48 C-49 C-50 C-51 C-52 C-53 C-54 C-55 C-56 C-57 C-58 C-59 C-60 C-61 C-62 C-63 C-64 C-65 C-66 C-67 C-68 C-69 C-70 C-70B C-71 C-72 C-73 C-74 C-75 C-76 C-77 C-77B–D C-78 C-79 C-80 C-81 C-82 C-83 C-83A C-83B C-84 C-85 C-86 C-87 C-88 C-89 C-90 C-91 C-92 C-93 C-94 C-95 C-96 C-97 KC-97 C-98 C-99 C-100 C-101 C-102 C-103 C-104 C-105 C-106 C-107 C-108 C-109 C-110 C-111 C-112 C-113 C-114 C-115 C-116 C-117 C-117D C-118 C-119 AC-119 C-120 C-121 C-121F EC-121 C-122 C-123 C-123A C-124 C-125 C-126 C-127² C-127 (I) C-127 (II) C-128 C-129 C-130 C-130J AC-130 DC-130 EC-130/H HC-130 KC-130 LC-130 MC-130 WC-130 C-131 NC-131H C-132 C-133 C-134 C-135 KC-135 C-136 C-137² YC-137 (I) YC-137 (II) C-137 C-138¹ C-139¹ C-140 C-141 C-142
Tri-service sequence (1962–present)	C-1 C-2 C-3 C-4 C-5 C-6 C-7² C-7 RC-7 C-8 C-9 C-10² C-10 KC-10 C-11 C-12 RC-12 C-13¹ C-14 C-15 C-16¹ C-17 C-18 C-19 C-20² C-20A–D C-20F–J C-21 C-22 C-23 C-24 C-25 C-26 C-27 C-27J C-28 C-29 C-30¹ C-31 C-32 C-33 C-34¹ C-35 C-36³ C-37 C-37B C-38 C-39¹ C-40 C-41 C-42¹ C-43¹ C-44¹ C-45 C-46
Revived original sequence (2005–present)	C-143 C-144 C-145 C-146 C-147
Non-sequential designations	C-767 C-880
Related designations	CT-39 CT-43 CV-2 CV-7
¹ Not assigned • ² Assigned to multiple types • ³ Unconfirmed

Wright Field project numbers (1930–1934)

¹ Not assigned

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