GE J-47 Engine Installation, Part 2

General Electric J47-GE-17B and J47-GE-33 Engine Installation
Part 2: Performance
Compiled by Kimble D. McCutcheon

J47 Installation Quick Links
Part 1: General Description	Part 2: Performance
Part 3: Installation Considerations	Part 4: Engine Systems
Part 5: Accessory Descriptions

The estimated minimum flight performance presented here was for standard NACA atmosphere conditions with the inlet screens retracted. The listed performance data is based on the use of fuel conforming to specification MIL-F-5624, and oil conforming to specification MIL-O-6081A, Grade 1005, and is presented for standard NACA atmospheric conditions. The inlet screens were retracted and no allowance was made for inlet duct losses, accessory drive loading or any compressor air bleed, other than that required for engine operation.

GE-J47-17B Sea Level Static Performance
Rating	rpm (%)	Jet Thrust (lb)	SFC (lb/hr/lb)	EGT (°F)
Maximum	100	7,500	2.30	1,265 ± 15
Maximum**	100	7,230	2.33	1,265 ± 15
Military	100	5,425	1.15	1,265 ± 15
Normal	100	4,990	1.13	1,175
90% Normal	98	4,490	1.12	–
75% Normal	92.2	3,730	1.11	–
**Screens Extended

GE J47-GE-17B Estimated
Minimum Flight Performance,
Maximum Rating
Altitude (ft)	Knots	Net Thrust (lb)	Net SFC (lb/hr/lb)
Sea Level	100	7125	2.44
	200	7,030	2.51
	300	7,135	2.53
	400	7,390	2.52
	500	7,975	2.43
15,000	400	5,570	2.78
	500	6,025	2.68
	600	6,650	2.54
35,000	400	2,940	2.69
	500	3,360	2.60
	600	3,945	2.59
50,000	400	1,400	3.11
	500	1,630	3.06
	600	1,925	2.96
**Screens extended

GE J47-GE-17B Military Rating
Altitude (ft)	Knots	Net Thrust (lb)	Net SFC (lb/hr/lb)
35, 000	400	1,715	1.430
	500	1,900	1.465
	600	2,125	1.505
45,000	400	1,070	1.480
	500	1,180	1.495
	600	1,330	1.535
50,000	400	840	1.475
	500	930	1.520
	600	1,045	1.490

GE J47-GE-17B Cruise Speeds
Altitude (ft)	Knots	Rpm (%)	Net Thrust (lb)	Net SFC (lb/hr/lb)
Sea Level	200	98	3,685	1.390
		90	2,640	1.500
		80	1,525	1.810
		70	740	2.840
	300	100*	4,220	1.455
		98	3,455	1.515
		90	2,375	1.705
		80	1155	2.340
	400	100*	4,250	1.530
		98	3,305	1.640
		90	2,150	1.985
25,000	300	100*	2,110	1.380
		98	1,675	1.420
		90	1,240	1.465
	400	100*	2,235	1.425
		98	1,725	1.505
		90	1,175	1.630
35,000	300	100*	1,495	1.370
		98	1,155	1.395
		90	945	1.410
	400	100*	1,595	1.420
		98	1,210	1.480
		90	930	1.530
*Normal Continuous

J47-GE-33 Sea Level Static Performance
Rating	rpm (%)	Gross Thrust (lb)	SFC (lb/hr/lb)	EGT (°F)
Maximum	100	7,650	2.30	1,265 ± 15
Maximum**	100	7,340	2.33	1,265 ± 15
Military	100	5,550	1.15	1,265 ± 15
Normal	100	5,100	1.13	1,175
	98	4,540	1.12	1,175 Max
**Screens Extended

J47-GE-33 Estimated
Minimum Flight Performance,
Maximum Rating
Altitude (ft)	Knots	Net Thrust (lb)	Net SFC (lb/hr/lb)
Sea Level	100	7,240	2.444
	200	7,110	2.546
	300	7,280	2.542
15,000	400	5,540	2.867
	500	6,090	2.689
	600	6,725	2.558
25,000	400	4,400	2.882
	500	4,985	2.860
	600	5,430	2.802
35,000	400	3,140	2.884
	500	3,645	2.806
	600	4,200	2.793
45,000	400	1,880	3.011
	500	2,200	2.960
	600	2,580	2.953
50,000	400	1,445	3.102
	500	1,695	3.027
	600	1,985	3.027

J47-GE-33 Military Rating
Altitude (ft)	Knots	Net Thrust (lb)	Net SFC (lb/hr/lb)
Sea Level	100	5,100	1.275
	200	4,840	1.364
	300	4,780	1.475
15,000	400	3,400	1.412
	500	3,580	1.508
	600	3,820	1.584
25,000	400	2,525	1.386
	500	2,710	1.439
	600	2,930	1.502
35,000	400	1,800	1.389
	500	1,960	1.449
	600	2,185	1.465
45,000	400	1,125	1.404
	500	1,220	1.459
	600	1,360	1.471
50,000	400	885	1.412
	500	970	1.448
	600	1,060	1.509

J47-GE-33 Cruise
Altitude (ft)	Knots	Rpm (%)	Net Thrust (lb)	Net SFC (lb/hr/lb)
Sea Level	200	90	2,600	1.481
		98	3,740	1.390
		100*	4,450	1.382
	300	90
		98	3,450	1.522
		100*	4,330	1.490
	400	90
		98	3,260	1.656
		100*	4,330	1.640
15,000	400	90	1,400	1.821
		98	2,280	1.513
		100*	3,100	1.453
	500	90	1,260	2.103
		98	2,300	1.630
		100*	3,250	1.450
	600	90	1,180	2.373
		98	2,360	1.737
		100*	3,425	1.607
25,000	400	90	1,100	1.614
		98	1,700	1.465
		100*	2,320	1.435
	500	90	1,030	1.796
		98	1,770	1.554
		100*	2,430	1.523
	600	90	975	1.897
		98	1,875	1.653
		100*	2,569	1.635
35,000	400	98	1,230	1.423
		100*	1,675	1.403
	500	98	1,310	1.473
		100*	1,850	1.459
	600	98	1,410	1.517
		100*	2,010	1.542
45,000	400	98	760	1.447
		100*	1,050	1.410
	500	98	920	1.304
		100*	1,140	1.469
	600	98	870	1. 563
		100*	1,240	1. 532
50,000	400	98	600	1.483
		100*	820	1.463
	500	98	640	1. 523
		100*	750	1.456
	600	98	690	1.558
		100*	770	1. 509
*Normal Continuous Rating

Engine Operating Limits:

• The engine was capable of air starts up to and including 40,000 feet altitude with a 1.20 – 1.25 ram pressure ratio at 100% ram conversion.
• The engine's absolute altitude was ≥55,000 feet at 1.4 ram pressure ratio.
• The engine's operational altitude was ≥50,000.

The engine functioned satisfactorily from 0 to 7,950 rpm with ≤1.6 ram pressure ratio at -65°F, ≤1.8 at 60°F, and ≤1.3 at 100°F ambient temperature.
The afterburner was capable of air starts ≤40,000 ft at a 1.40 – 1.80 ram pressure ratio.
The afterburner operated satisfactorily with a ≤1.6 ram pressure ratio at -65°F ambient temperature, ≤1.8 at 60°F, ≤1.3 at 100°F.

The maximum average allowable measured gas temperature was as follows:

Temperature

Condition °F °C

Maximum (15 Minutes) 1,265 ± 15 685 ±8.0

Military (30 minutes) 1,265 ± 15 685 ±8.0

Normal rated and below (Max Continuous) 1,175 635

The maximum measured average transient gas temperature did not exceed 1,600°F (871°C) for 20 seconds. The engine was provided with an automatic temperature control designed to prevent the exhaust gas temperature from exceeding the these limits. The repeatability of this automatic control provided normal engine operation without exceeding the above limits for all ambient temperatures between -65°F and +160°F.

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	Temperature
Condition	°F	°C
Maximum (15 Minutes)	1,265 ± 15	685 ±8.0
Military (30 minutes)	1,265 ± 15	685 ±8.0
Normal rated and below (Max Continuous)	1,175	635


Fig. 2.01. Flight Idle Speed	Fig. 2.02. Operating Limits	Fig. 2.03. Acceleration Time