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North American NA-73 / P-51 Mustang / A-36 Apache / P-78

P-51D, P-51C, P-51D


The P-51 was designed in just three months by Raymond Rice, Edgar Schmued and other, under the overall control of North American’s president, J .H. “Dutch” Kindelburger, as the NA-73 in 1940 at Britain's request that specified the construction of the prototype within 120 days. The NA-73 XP-51prototype, NX19998, was rolled out after 117 days.
North American NA-73X NX19998
First flying on 26 October 1940, piloted by Vance Breese.
Fitted with the same Allison V-1710 engine as the P 40, the Mustang proved to be a useful close support fighter and tactical reconnaissance aircraft. The aeroplane was soon ordered by the British and Americans as the Mustang and P-51 respectively.
North American XP-51 41-039
Two XP-51 were built from the initial British production batch (41-038/039).
In 1941 one hundred and forty eight P-51 NA-91 (41-37320-37351, 41-37353-37420, 41-37422-374690 were built, of which 2 became test beds for Packard V-1650 as XP-51B (XP-78), and of which many early models became A-36A, plus 650 NA-73/NA-83 for RAF as Mustang I/IA (many were converted in England to Rolls-Royce Merlin).
North American Mustang I
The design showed promise and AAF purchases of Allison-powered Mustangs began in 1941 primarily for photo recon and ground support use due to its limited high-altitude performance. A total of 310 P 51As were built. The 1942 P-51-1 armed recon adaptation with four wing cannon and two K-24 cameras was briefly designated F-6A at first, the unique final designation signified a batch of 57 withdrawn from an RAF Mustang I contract for USAAF duty. Fifty P 51As were allocated to the RAF as Mustang Mk IIs, while 35 were converted to F 6B tactical reconnaissance planes. Top speed was 390 mph.
The initial P-51 and P-51A variants proved only moderately successful but in 1942, tests of P-51s using the British Rolls-Royce "Merlin" engine revealed much improved speed and service ceiling. This produced the P-51B with four machine guns and the P-51C with more power and a bubble canopy. In December 1943, Merlin-powered P-51Bs first entered combat over Europe.

The P-51C was built in the newly constructed North American factory in Dallas, Texas, and was essentially the same as the P-51B.

In 1943 a bubble canopy was adopted for the P-51D, which became the main version of the famous fighter and entered combat over Europe in March 1944.

The aircraft is stressed for aerobatics and is capable of most all maneuvers with the exception of sustained inverted flight, snap rolls, outside loops, and inverted spins.



There are a number of variables regarding engines. The basic engine is the Packard built V-1650-7. The V-1650-9 was also used and is interchangeable. This V-12 engine is designed with 2 removable Cylinder bank assemblies of 6 cylinders each. These are referred to as head and banks. There are a number of engines that have been fitted with the" Transport Heads."   "Transport Heads" refer to British built assemblies that were used on a commercial aircraft engine and were designed for long life.

The basic V-1650-7 engine lower end will have a TBO in civil use of about 600 hours. The V-1650-7 heads and banks will probably require some rework at about 300 hours. The transport heads will normally last to TBO and beyond.

The P-51D holds 184 US gallons. The military used drop tanks of a maximum capacity of 110 gallons each and had a 85 gallon rear fuselage tank . Most civil operators do not use drop tanks and have a rear jump seat in place of the fuselage tank. With a normal cruise fuel burn of 65 GPH, this gives a 2 2 hour endurance with a small reserve.

A steerable type system uses an interconnect from the rudder pedals to the tailwheel steering system.  This allows the pilot to steer the aircraft by use of the rudder pedals. Full forward stick movement unlocks this system. When unlocked the tailwheel becomes full swivel and steering is accomplished by differential braking.

The aircraft uses a low-pressure 1000 psi hydraulic system.  The pressure is controlled and maintained by a regulator. The pilot simply operates the flaps or the gear and it works automatically. The wheel brakes are non-boosted, hydraulically actuated from individual master cylinders. The aircraft use standard MIL-5060 (red) fluid.

The aircraft has a 24 Volt D.C. system with a 100-amp generator. Some aircraft have an alternator installed. Normal aircraft have no AC electrical devices installed. A standard battery is used to provide starting and back up power. The aircraft does not require a ground power cart for normal use.


The definitive P-51D variant amounted to 7,966 of the 15,469 Mustangs.

The only AD on the P-51 is 81-13-01. The AD calls for inspection of the Hamilton Standard prop for corrosion. This AD starts out with an 18 month inspection interval and the interval lengthens to 60 months as the prop builds a history.


Four P-51D of the 8th Army Air Force’s 361st Fighter


The only AD on the P-51 is 81-13-01. The AD calls for inspection of the Hamilton Standard prop for corrosion. This AD starts out with an 18 month inspection interval and the interval lengthens to 60 months as the prop builds a history.

The RNZAF received 30 P-51Ds in late 1945 of what would have been 370 replacements for Corsairs. War’s end led to the cancellation of the remainder.

Providing high-altitude escort to B-17s and B-24s, they scored heavily over German interceptors and by war's end, P-51s had destroyed 4,950 enemy aircraft in the air, more than any other fighter in Europe.

Mustangs served in nearly every combat zone, including the Pacific where they escorted B-29s to Japan from Iwo Jima. Between 1941-5, the AAF ordered 14,855 Mustangs (including A-36A dive bomber and F-6 photo recon versions), of which 7,956 were P-51Ds.

A-36 Apache

A total of 15386 aircraft were built including 500 A-36As and 120 P-51Ds assembled in Australia (CAC CA-17). 620 were exported to the RAF for a total to the USAAF/USAF of 14,365.

During the Korean War, P-51Ds were used primarily for close support of ground forces until withdrawn from combat in 1953.

The U.S. Military and the Royal Canadian Air Force made the largest surplus release of these aircraft in the late 50's and early 60's. A number of aircraft previously served with the forces of over seas countries. The aircraft sold as surplus in 1958 for prices ranging from $800-1500. The Mustang is probably the most recognized fighter of World War II and has proven to be a popular and widely used civilian Warbird.

Many people refer to the "Cavalier" Mustang as the ultimate conversion for civilian use. This conversion was performed by Trans Florida Aviation of Sarasota in the mid 60's to the early 70's. While this conversion was very nice at that time, most restorations done in the last 10-15 years are of superior quality. The Executive Mustang, or Cavalier, rebuild and conversion involved plush, soundproofed cockpit, IFR electronics, baggage compartments in former gun bays, 402-gal fuel tanks, and zero-time majored 1500hp Packard-Merlin V-1650-7 engine. SYSTEMS
Successor to Trans-Florida Aviation, acquired during 1960s type certificate for North American F-51 Mustang, producing tandem two-seat business/sport conversions of F-51D as Cavalier 2000 series, and building new single-seat F-51Ds for the USAF counterinsurgency Military Assistance Program. Prototype of Mustang II, two-seat COIN patrol/attack version equipped with heavier armament, flew December 1967; prototype Turbo Mustang III (with Rolls-Royce Dart) in 1969. Second prototype flew in April 1971, equipped with Lycoming T55 engine, by which time the program had been sold to the Piper Aircraft Corporation, but then the company was dissolved.
Priced at $32,500 less radio 19 were reportedly under way by the end of 1959 (44-11558=N6175C, -72844=N5076K, -73027, -73260=N5075K, -73411=N550D, -73584=N51Q, -73656=N5073K, -73843=N351D, -74427, -74441, -74453, -74458/74459, -74469=N7723C, -74831, -74854, -84658=N7724C, 45-11381=N5471V, -11489=N5421V).
Executive Mustang / Cavalier variants:
Cavalier 750
No tip tanks.
Cavalier 1200
As 750
with two additional 45-gal internal wing tanks.
Cavalier 1500
As 750, with two additional 63-gal internal wing tanks.
Cavalier 2000
110-gal tip tanks.
Cavalier 2500
As 2000, with two additional 63-gal internal wing tanks.
Cavalier Mustang II
F-51D modified for counter-insurgency duties
1760hp RR Merlin 620.
2 built.
Turbo Mustang III
1968 or 1971

Prototypical COIN design for production by Piper Co as PA-48 Enforcer.

The TF-51D was originally built by TEMCO aircraft and incorporated a full rear cockpit with Dual Controls. In the last several years this conversion has been produced by a California company and is very popular. It added about $250,000 to the price of a Mustang.


LSA / Ultralight Replicas:
Loehle Aviation 5151
FK Lightplanes FK51 Mustang

Experimental Replicas:

Stewart S-51D
Papa 51 Inc Thunder Mustang
Thunder Builders Group Thunder Mustang
Titan Aircraft P-51
Falconair SAL Mustang P-51
Cameron & Sons P-51
KWP-51 K-W Mustang
Bonsall Mustang MkII


P-51 Mustang variant production


Number built/Converted 2
Model NA-73; Developed for UK

Number built/Converted 150
Prod. model; 4 20mm cannon

Number built/Converted 310
Fitted w/ bomb racks; 4 .50-cal. mgs

Number built/Converted 2
Imp. P-51; was XP-78

Number built/Converted 1988
Prod. model; Blks 1-15; Inglewood

Number built/Converted 1750
Dallas Plant; Blks 1-11

Number built/Converted 6502
Bubble Canopy; Blks 1-30

Number built/Converted 1454
Blks 5-30; 6 .50-cal. mgs.

Number built/Converted 10
2-place trainer variant

Number built/Converted 0
Model not assigned

Number built/Converted 3
Exp. lt. weight test model

Number built/Converted 2
Mod. XP-51F w/ new eng.

Number built/Converted 555
Prod. model; Blks 1-10

Number built/Converted 2
Mod. XP-51F w/ new eng.

Number built/Converted 1337
Imp. -D; Aeroprop; Blks 1-15

Number built/Converted 0
Imp. -H w/ new eng.

Number built/Converted  1
Imp. -H w/ new eng.



Specifications -


Engine: Allison V-1710, 1100 hp
Wingspan: 37'0"
Length: 32'2"
Useful load: 2250 lb
Max speed: 387 mph
Cruise speed: 307 mph
Stall: 120 mph
Range: 350 mi
Seats: 1


XP-51 / NA-73
Engine: Allison V-1710-39, 1100hp
Wing span: 37'0"
Length: 32'3"
Useful load: 1687 lb
Max speed: 382 mph
Cruise speed: 300 mph
Range: 625 mi

Ceiling: 30,800 ft

P-51A / Mustang Mk.II
Engine: Allison, 1200 hp
Max speed: 394 mph @ 15,000 ft.

Max speed: 441 mph
Max range: 1300 mph
Armament: 4 x .50 in Browning mg
Bomb load: 2 x 1000 lb

Engine: Merlin V-1650/3, 1210 hp @ 25,800 ft
Max speed: 439 mph
Max range: 2700 miles
Armament: 4 x .50 in Browning mg
Bomb load: 2 x 1000 lb

Engine: Packard Merlin V-1650-7 or V-1650-9, 1450 hp / 1,695 hp
Propeller: Hamilton Standard 4-Blade 24D50, 134"
Span: 37 ft 0.25 in / 11.89 m
Length: 32 ft 3.25 in / 9.85 m
Height: 13 ft 8 in / 4.16 m
Wing area: 21.65 sq.m / 233.04 sq ft
Frontal Area: 13.4 sq.ft.
Max take-off weight: 5488 kg / 12099 lb
Normal Gross Weight: 9450 lb
Empty weight: 3232 kg / 7125 lb
Wing Loading: 49.2 lbs/sq.ft.
Power Loading: 7.78 lbs/hp
Drop tank maximum capacity: 2 x 110 USG
Rear fuselage tank capacity : 85 USG
Maximum speed: 703 km/h / 437 mph at 25,000 ft
Speed @ Sea Level: 326 kts (375 mph, 603 kph)
Normal cruise: 240 kt at 65 USgph at 8000 ft
Cruise Speed @ 75% Power: 250 kts (300 mph, 483 kph)
Range normal: 950 sm,
Range max: 1710 sm
Service Ceiling: 12770 m / 41,900 ft.
Rate of Climb @ gross: 2800 ft/min
Climb to 30,000 ft / 9,145 m: 13 minutes 0 seconds
Vx (best angle of climb): 87 kts
Vy (best rate of climb): 148 kts
Va (design maneuvering): 226 kts
Vfe (max flaps extended): 143 kts
Vle (max landing gear extended): 148 kts
Vne (never exceed): 439 kts
Vsl (stall, clean): 92 kts
Vso (stall, in landing config.): 88 kts
Best Glide: 152 kts
Armament: Six .50-cal. machine guns / 2,000 lb external
Design Limit Load Factor: +8g / -4g @ 8000 lbs / +5.5g / -2.5g @ 11600 lbs.
Crew: 1
Cost: $54,000


Engine: Packard Merlin V-1650-9
Max speed: 487 mph @ 25,000 ft

Engine: Allison 119/F32, 1700 hp @ 20,700 ft
Max speed: 492 mph @ 27,400 ft.

Engine: Allison, 1200 hp
Max speed: 390 mph.

Mustang 4
Engine: 1,520 h.p. Packard Merlin V1650-3
Span: 37 ft
Weight: 10,000 lb
Max. Speed: 445 mph



North American P-51 Mustang



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