T37
Type	Turboprop
National origin	United States
Manufacturer	Turbodyne
First run	1944
Major applications	Northrop EB-35B proposed

The Northrop-Hendy T37 Turbodyne (company designation N-10) was an American turboprop engine developed by the Turbodyne Division of Northrop in the late 1940s.

Design and development

Turbodyne I

Northrop undertook a private venture to develop a turboprop engine from 1939 and was awarded a joint US Army/US Navy contract in 1941 for design, analysis and fabrication of a research compressor for the proposed engine. The contract was amended later to call for construction of two complete engine prototypes.

Northrop had neither the space or expertise to fabricate the engines in a reasonable time-scale so they joined forces with the Joshua Hendy Iron Works in 1944 to form the Northrop-Hendy company. the two prototype engines were completed and test run in late 1944, but the first engine compressor failed, destroying the engine. Meanwhile the USN cancelled their interest in the engine in 1945, leaving the US Army to carry on. Testing continued with the second engine until that too failed, terminating the programme.^[1]

Throughout testing the prototype engines failed to meet performance estimates due to poor compressor and turbine efficiencies.^[1]

XT37

Northrop-Hendy continued their partnership to develop the XT37, a large turboprop, expected to deliver ca 10,000 shp (7,500 kW), but this too failed to deliver on the promised performance.^[1]

N-10 designation confusion

Officially, the company designation N-10 was assigned to the T37 Turbodyne. However, drawings exists of a flying wing cargo aircraft designated N-10. The reason that both the Turbodyne and this flying wing design were assigned the designation is unknown.^[2]

General characteristics

Type: Turboprop
Length: 93 in (2,400 mm)
Width: 41 in (1,000 mm)
Height: 63 in (1,600 mm)
Diameter:
Dry weight: 7,000 lb (3,200 kg)

Components

Compressor: 18-stage axial compressor
Combustors: annular combustion chamber with eight flame tubes
Turbine: 4-stage axial-flow
Fuel type: JP-4
Oil system: Pressure spray with scavenge

Performance

Maximum power output: 2,400 shp (1,800 kW) at 10,000 rpm
Specific fuel consumption: 0.58 lb/hp/h (0.098 kg/kW/ks)
Power-to-weight ratio: 2.32 hp/lb (3.81 kW/kg) equivalent

Specifications (Northrop-Hendy Turbodyne I)

Data from Turbine- and Jet-propelled Aircraft Powerplants,^[3] Wright's T35 Turboprop Engine, et al.,^[4] NASM^[1]

References

^ ^a ^b ^c ^d "Northrop-Hendy Turbodyne I Turboprop Engine". National Air and Space Museum. 17 March 2016. Retrieved 6 February 2019.
^ Chong, Anthony (2016-06-15). Flying Wings & Radical Things: Northrop's Secret Aerospace Projects & Concepts 1939-1994. Specialty Press. pp. 26, 27. ISBN 978-1-58007-229-8.
^ Earnes, J.P. (1954). Turbine- and Jet-propelled Aircraft Powerplants.
^ Culy, Doug. "Wright's T35 Turboprop Engine, et al". www.enginehistory.org. Retrieved 6 February 2019.

v t e United States military gas turbine aircraft engine designation system
Turbojets	J30 J31 J32 J33 J34 J35 J36 J37 XJ38 J39 J40 XJ41 J42 J43 J44 J45 J46 J47 J48 XJ49 J51 J52 J53 J54 J55 J56 J57 J58 J59 J60 J61 J63 J65 J67 J69 J71 J73 J75 J79 J81 J83 J85 J87 J89 J91 YJ93 J95 J97 J99 J100 YJ101 J102 J400 J401 J402 J403 J700
Turboprops/ Turboshafts	T30 T31 T33 T34 T35 T36 T37 T38 T39 T40 T41 T42 T43 T44 T45 T46 T47 T48 T49 T50 T51 T52 T53 T54 T55 T56 (variants) T57 T58 T60 T61 T62 T63 T64 T65 T66 T67 T68 T69 T70 T71 T72 T73 T74 T76 T78 T80 T100 T101 T400 T405 T406 T407 T408 T700 T701 T702 T703 T706 T708 LHTEC T800 APW T800 T900 T901
Turbofans	TF30 TF31 TF32 TF33 TF34 TF35 TF37 TF39 TF41 F100 F101 F102 F103 F104 F105 F106 F107 F108 F109 F110 F112 F113 F117 F118 F119 YF120 F121 F122 F124 F125 F126 F127 F128 F129 F130 F135 F136 F137 F138 F400 F401 F402 F404 F405 F408 F412 F414 F415
Adaptive cycle engines	XA100 XA101

Northrop aircraft and aircraft engines

Manufacturer
designations

'Greek' series	Alpha Beta Gamma Delta
'N' series	Note: Northrop company designations include a wide variety of technologies. Only aircraft, aero engines, and missiles are linked here. N-1/M N-2 N-3 N-4 N-5 N-6 N-7 N-8 N-9/M N-10 N-12 N-14 N-15 N-16 N-18 N-19 N-20 N-21 N-23 N-24 N-25A/B N-26 N-29 N-31 N-32 N-34 N-35 N-36 N-37 N-38 N-39 N-40 N-41 N-45 N-46 N-47 N-48 N-49 N-50 N-51 N-52 N-54 N-55 N-59 N-60 N-63 N-65 N-67 N-68 N-69 N-71 N-72 N-73 N-74 N-81 N-82 N-84 N-86 N-87 N-94 N-96 N-102 N-103 N-105 N-110 N-111 N-112 N-117 N-124 N-132 N-133 N-134 N-135 N-138 N-141 N-144 N-149 N-150 N-151 N-155 N-156 N-165 N-204 N-205 N-250 N-251 N-267 N-285 N-300 N-301 N-302 N-303 N-304 N-305 N-306 N-307 N-311 N-320 N-321 N-322 N-330 N-353 N-370 N-381
'P' series	P530 P600 P610 P630

By role

Attack	YA-13 XA-16 A-17/Nomad N-3PB YA-9
Bombers	YB-35 YB-49 B-62 BT B2T B-2
Drones	Q-4
Fighters	3A XP-56 P-61 XP-79 F-89 XFT F2T F-5/CF-5/CF-116 YF-17 F-18L F-20 YF-23
Reconnaissance	F-15 RF-61 RF-5 N-165 N-204
Trainers	T-38
Transports	Alpha Beta Gamma Delta C-19 C-100 YC-125 RT
Experimental	N-1M N-9M JB-1 MX-324 MX-334 M2-F2 M2-F3 HL-10 Tacit Blue X-4 X-21

Aircraft
engines

XT37

Names