Boeing Monomail

Model 200 and 221 Monomail

Model 221 of United Airlines
Role	Airliner
Manufacturer	Boeing
First flight	6 May 1930
Retired	1933
Status	Retired
Primary user	United Airlines
Number built	2
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; however the single pilot 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 30's, 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

Operators

United States

Specifications (Model 221)

General characteristics

Crew: One pilot
Capacity: 6 passengers
Length: 42 ft (13 m)
Wingspan: 59 ft (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 (429 kW)
Propellers: 2-bladed

Performance

Maximum speed: 158 mph (254 km/h; 137 kn)
Cruise speed: 135 mph (117 kn; 217 km/h)
Range: 575 mi (500 nmi; 925 km)
Service ceiling: 14,700 ft (4,481 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.

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/A C-42 C-43 C-44 C-45 C-46 C-47/T 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/A/B/C/D C-71 C-72 C-73 C-74 C-75 C-76 C-77/B-D C-78 C-79 C-80 C-81 C-82 C-83 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-118 C-119 C-120 C-121/F C-122 C-123/A C-124 C-125 C-126 C-127 (I) C-127 (II) C-128 C-129 C-130/J C-131 C-132 C-133 C-134 C-135/KC-135 C-136 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-7/B C-8 C-9 C-10 C-11 C-12 C-13¹ C-14 C-15 C-16¹ C-17 C-18 C-19 C-20A-D/F-H C-21 C-22 C-23 C-24 C-25 C-26 C-27/J C-28 C-29 C-30¹ C-31 C-32 C-33 C-34¹ C-35 C-36 C-37A/B 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

Non-sequential designations	C-767 C-880

¹ Not assigned See also: AC-47 • AC-119 • AC-130 • DC-130 • EC-130 • HC-130 • KC-130 • LC-130 • MC-130 • WC-130 • CT-39 • CT-43

Boeing airliners

Piston-engined	40A 80 221 247 307 314 377

Jet-engined	367-80 707/720 717 727 737 737 Classic 737 NG 747 747SP 747-400 747-8 757 767 777 787

In development	737 MAX 777X

Proposed	Y1 Y3

Not developed	2707 7J7 New Large Airplane Sonic Cruiser

Boeing model numbers

Aircraft	1 2 3 4 5 6 6D 6E 7 8 10 15 16 21 40 42 50 53 54 55 58 63 64 66 67 68 69 72 74 75 77 80 81 83 89 93 95 96 99 100 101 102 200 202 203 204 205 214 215 218 221 222 223 226 227 234 235 236 246 247 248 251 256 264 266 267 273 280 281 294 299 300 306 307 314 316 344 345 367 367-80 377 400 450 451 464 466 474 479 701 818 953 707 717 (i) 717 (ii) 720 727 733 737 739 747 757 767 777 787 2707

Turbine engines	500 502 520 550

Vessels	929

Other	Boeing Customer Codes

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