Martin XO-4 - Aeroplane - avia.wikisort.org

avia.wikisort.org - Aeroplane

The Martin XO-4 (Model 71) was a proposed observation aircraft designed by the Glenn L. Martin Company.^{[citation needed]}[1] It was designed to compete with the Curtiss XO-1, Douglas XO-2, and Dayton-Wright XO-3, and was to be powered by a Wright T-3 Tornado or a Liberty V-1650.[2][3] Although it failed to receive a contract from the United States Navy, a single prototype (allocated the serial number 23-1255) was ordered by the United States Army Air Service, but this contract was canceled before the prototype could be built.[2][4]

XO-4
Role	Observation Type of aircraft
National origin	United States
Manufacturer	Glenn L. Martin Company
Status	Canceled
Number built	0

References

Duell, Sloan and Pearce (1947). The Official Pictorial History of the AAF. United States Army Air Forces Historical Office.
Air Service Information Circular. Director of Air Service. 1923.
"O - Observation Aircraft". 2007-03-16. Archived from the original on 2007-03-16. Retrieved 2020-06-15.
"USAF Serial Number Search Results". cgibin.rcn.com. Retrieved 2020-06-15.

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United States observation aircraft designations, USAAC/USAAF and Tri-Service systems

USAAC/USAAF sequence
(1924–1942)

O-1
O-2
O-3
O-4
O-5
O-6
O-7
O-8
O-9
O-10
O-11
O-12
O-13
O-14
O-15
O-16
O-17
O-18
O-19
O-20
O-21
O-22
O-23
O-24
O-25
O-26
O-27
O-28
O-29
O-30
O-31
O-32
O-33
O-34
O-35
O-36
O-37
O-38
O-39
O-40
O-41
O-42
O-43
O-44
O-45
O-46
O-47
O-48
O-49
O-50
O-51
O-52
O-53
O-54
O-55
O-56
O-57
O-58
O-59
O-60
O-61
O-62
O-63

Tri-service sequence
(1962–present)

O-1
O-2
O-3
O-4¹
O-5
O-6

Related designations	OV-1 OV-10 OV-12

¹ Unconfirmed

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Airliners	M-130 Clipper M-156 Russian Clipper 2-0-2 3-0-3 4-0-4
Attack aircraft	A-15 A-22 A-23 A-30 A-45 AM
Bombers	B-10 B-12 XB-13 XB-14 XB-16 B-26 XB-27 B-33 B-48 XB-51 B-57 XB-68 BM MB-1 NBS-1
Maritime patrol	PBM XP2M P3M P4M P5M P6M P7M
Military transports	C-3 JRM RM
Military trainers	T/TT N2M
Scout/Torpedo bombers	S TM T2M T3M T4M T5M T6M
Reconnaissance aircraft	MO-1 M2O-1 MS-1 RB-57D RB-57F
Observation aircraft	XO-4
Martin Marietta	845 SV-5J X-23 X-24A/B