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Stearman 75 / PT-13 / PT-17 / NS-1 / N2S / PT-18

stear-pt17
PT-17


In 1934, the Stearman Aircraft Company became a Boeing subsidiary and placed its Model 73 into production. It was a variation of both the Stearman Model C series that was produced between 1926 and 1930 and the Model 70 prototype that was completed in 1933. Out of this biplane grew a family of primary trainers, of which more than 2,000 were produced by 1945. The Model 76 was simply a larger version of the Model 75, which was the most prominent member of the family.

The Model 75 was powered by a 215 hp Lycoming and was designated by the military as the PT-13. The series that was produced in the largest numbers was the Model A75NI. It was similar to the PT-13 but was powered by a 220 hp Continental radial engine; its military designation was PT-17. The Navy named the Boeing 75 the NS-1, later evolved into the N2S series.

The Royal Canadian Air Force ordered 300 winterized versions of the PT-17 and unofficially changed the name to Kaydet, a name that has come to apply to the entire family of Stearmans.

The last of the 75 series to be produced was the Model E-75 powered by a 220 hp Lycoming engine. When production was terminated on V-J Day, its production totaled more than 1,700 as both the PT-13D and the N2S-5.

The Stearman Model 75 design evolved out of the X-70 prototype produced in 1934 and the Model 73 (the US Navy NS-1). A proto-type X-75 was built, and this was soon followed by an or-der for 32 as the PT-13, known as the Stearman Kaydet, in 1936. This aircraft was powered by a 215-hp Continental R-680-5. The Model A-75 appeared in 1937 as the PT-13A (92 ordered) and fitted with an R-680-7 of 220 hp.

The Model A-75N1 appeared in 1940 as the PT-17BW, of which 3,064 were delivered to the USAAF. This model was powered by a 220 hp Continental R-670-5. Even in wartime the aircraft had an agricultural role - three were converted to PT-17B-BW and fitted with hoppers and spray booms for mosquito control.

Then came 220 PT-13Bs with the 209-kW (280-hp) R-680-11s of which six became blind-flying PT-l3Cs, and 895 PT-13Ds with R-680-1 engines.

A change to the R-670 engine produced the PT-17, of which 2,942 were built including 136 blind-flying PT-17As.

 

Stear-PT-17A

Boeing-Stearman PT-17A Kaydet


The PT-18, the model A-75J1, was fitted with a Jacobs R-755 of 225 hp, and these 150 aircraft included six blind-flying PT-18As.

The US Navy also operated over 4,500 Kaydets as train-ers and they were designated N2S-1 through to N2S-5: the X70 with the Wright R-790-8 became the NS-1, and these 61 were followed by 250 N2S-1s with the R-670-14, 125 N2S-2s with the R-680-8, 1,875 N2S-3s with the R-670-4, 577 N2S-4s with the 8-670-4/5, and 1,430 N2S-5s with the R-680-17. The primary difference between the Army and Navy airplanes, other than engines installed, was the tail wheel. Army airplanes had a fully steerable tail wheel while the Navy airplanes were equipped with a full swivel type with a lock. Most Stearmans today have subsequently been modified with the steerable tail wheel.

The propellers generally in use on Stearmans are the Sensenich wooden prop; the ground adjustable McCauley steel blade prop and the fixed pitch Hamilton Standard propeller.

Three hundred PT-27s (Model D-75N1s) were built for Royal Canadian Air Force with enclosed cock-pits. The RCAF's 300 Model PT-27's were ordered with special modifications for air training, particularly in Canada's winter weather conditions. The PT-27 required navigation lights, an enclosed, heated cockpit and a blind-flying hood; however, only one Stearman arrived with the enclosed cockpit. After four months of active service with the BCATP, the PT-27s were traded to the US for Fairchild Cornells because of the unsuitability of the open cockpit for winter training.

The first production Model 75s were built by the Stearman Aircraft Company, but most were built by Boeing at their Wichita plant in the state of Kansas until 1943. 8,428 aircraft were produced at Wichita, purchased by the US Government for around US$8,600 each until produc-tion ended in 1943.

The final version of the Stearman was the E75, designated PT-13D/N2S-5. It was the only complete standardization of an Army and Navy production design during WWII and was totally the same for both services.

This tandem two seat biplane was of mixed construction with fabric covering over wooden wings and fuselage of welded steel tube.

In 1946, the surplus trainers were sold at prices between US$250 and US$875, many in new condition with zero-timed engines. They were soon modified for agricultural use, retaining the Continental engines but the following year an operator fitted a PT- 17 with a 300-hp R-680 Lycoming and a 140 US gallon hopper.
During the 1950s the Stearman began appearing with the 450-hp Pratt & Witney R-985s, and various changes in the wings and fuselage also started to appear. The traditional open cockpit was replaced with a windshield and support structure, and some aircraft had an enlarged rudder. The wings came in for change as well, with extensions or end plates. The late 1960s saw further modifications with the original top wing fitted with ailerons. Into the ‘70s, an enclosed cockpit was installed. This did not have side doors - the whole canopy was lifted up and slid rearwards. All these modifications were local STCs, and it was apparent travelling around California that not only were some modifications strictly within the company, but some mods were also confined to within a few counties, and moving on to another county the aircraft would return to stock standard configuration.

Post-war civil requirements for surplus military Stearmans is covered by Aircraft Specification A-743. This document lists all the approved equipment allowed on a standard category Stearman and the items that must have been removed, replaced or modified when the military surplus Stearman was first licensed as a civilian airplane. It was required that all Continental R-670 engines, when transferred to civilian use, be re-designated and have the engine identification plate changed to show the civilian designation.

Permissable Acrobatics
Spins
Inside Loops
Snap Rolls under 106 mph (92 kts)
Slow Rolls under 124 mph (108 kts)
Immelmann Turns
Inverted Flight
Inverted Spins

Boeing built 8584 Kaydets in all versions, plus the equivalent of 2000 more in spares. It was manufactured by the Stearman Aircraft Company in Wichita, Kansas from 1934 through 1945. The actual total of Model 75’s that were completed from the prototype X-75 to the final E75 built in 1945 was 8,428.

75 / PT-13
Engine: Lycoming R-680-5, 160-kW (215-hp)
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75 / PT-13A
Engine: Lycoming R-680-7, 164-kW (220-hp)
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75 / PT-13B
Engine: Lycoming R-680-11, 209-kW (280-hp)
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

PT-13C
Engine: Lycoming R-680-11, 209-kW (280-hp)
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

PT-13D
Engine: Lycoming R-680-1
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75B4
To Venezuela                        
Engine: Lycoming R-680-11
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75J1 / PT-18
Engine: Jacobs R-755

A75L3
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75L5
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75N1 / PT-17
Engine: Continental R-670-4 & -5, 164kW (220 hp)
Wingspan: 32’ 02” / 9.8 m
Length: 24’ 09” / 7.54 m
Wing area: 297.4 sq.ft / 27.59 sq.m
Height: 9.154 ft / 2.79 m
Empty weight: 1031 lbs
Loaded weight (training role): 2,635 lb
Wing loading: 8.82 lb/sq.ft / 43.0 kg/sq.m
Armament: none
Max T/O weight: 1195kg (2,6351b)
Max speed: 117 kts / 217 kph / 135 mph at sea level
Operational range: 500 miles / 432 nm / 800 km
Crew: 2

PT-17A
Engine: 1 x Continental R-670-5, 164kW (220 hp)
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

PT-17E
Engine: Lycoming, 225 hp
Wing span: 32 ft (9.75m)
Length: 25.5 ft (7.8m)
Height: 11 ft (3.4m)
MTOW: 2900 lb (1300 kg)

A75N1 / N2S-1
Engine: Continental R-670-4
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75N1 / N2S-2
Engine: Lycoming R-680-8
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

A75N1 / N2S-4
Engine: Continental R-670-4 & -5
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

B75 / N2S-2
Engine: Lycoming R-680-8
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

B75N1 / N2S-3
Engine: Continental R-670-4
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

D75N1 / PT-27 Kaydet
To Canada
Engine: Continental R-670-6N, 220 hp
Wing Span: 32ft 2in (9.6m)
Length: 24ft 4in (7.3m)
Height: 9ft 2in (2.8m)
Range: 505 miles (813 km)
Speed: 124mph (199km/h)

E75 / PT-13D / N2S-5
Engine: Lycoming R-680-17
Fuel consumption: 12-13 USG/hr
Length: 25 ft 1 in
Height: 9 ft 4.5 in
Wing span upper: 32.2 ft
Wingspan lower: 31.2 ft    
Wing area: 297 sq.ft
Airfoil: NACA 2213
Empty wt: 1936 lb
Max weight: 2950 lb    
Fuel capacity: 46 USG (4-7 USG unusable)
Oil cap: 4.4 USG    
Ceiling: 11,200-12,800 ft
Range: 300 sm / 260 nm
Vne: 186 mph (163 kts)
Max speed: 125 mph
Normal Cruise: 95 mph (83 kts)
Power Off Stall: 55 mph (48 kts)
Power On Stall Speed: 51 mph (44 kts)
Take-Off Distance: 600 ft
Landing Distance: 300-500 ft
Initial Rate of Climb: 800 ft./min
Service Ceiling: 13,300 ft
Endurance: 3.4 hours (approx.)
Maximum Baggage: 60 lbs

 

 


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