Curtiss P-1 Hawk - Variants

Variants

While a total of 202 Hawks were built in the basic variants PW-8, P-1, P-2, P-3, P-5, AT-4 and AT-5, conversions resulted in 148 having a P-1 designation.

XPW-8

3 manufactured, one modified to XPW-8A and later XPW-8B standard, one converted to CO-X two-seat observation aircraft.

PW-8

25 produced and flown by 17th Pursuit Squadron

XPW-8A

An XPW-8 converted with a new cooling system and modified wings for trials

XPW-8B

Model 34 - The XPW-8A fitted with single-bay tapered wing as prototype for the P-1 series.

P-1

Model 34A - Production version of the XPW-8B with modified rudder and additional wing center strut, and Clark Y aerofoil, powered by 435 hp (324 kW) Curtis V-1150-1 (D12), 10 built.

P-1A

Model 34G - P-1 with 3-inch fuselage stretch, larger wheels and revised fuel system, 25 built with D-12C engine and three conversions from P-2. Final two converted to XAT-4 Trainer and XP-3 racer prototypes. Delivered in 1926.

XP-1A

One P-1A used for development trials.

P-1B

Model 34I - 25 produced with Curtis V-1150-3 (D-12D) engine. Increased weight reduced performance. Delivered 1927.

P-1C

Model 34O - 33 built with Curtis V-1150-5 (D-12E) engine. Increased weight further decreased performance. delivered 1927-28.

XP-1C

One P-1C fitted with a revised radiator.

P-1D

24 conversions from AT-4 trainers, re-engined with Curtis V-1150-3 (D-12D) engines.

P-1E

4 conversion from AT-5 trainers re-engined with 440 hp (328 kW) V-1150-3 built as AT-4s and converted to XAT-5 prototype. All re-engined and converted to P-1E.

P-1F

24 conversions from AT-5A trainers, one conversion from XP-21A, all re-engined with a 440 hp (328 kW) Curtis V-1150-3 in 1929.

P-2

Model 34B - P-1 with a 500 hp (373 kW) Curtiss V-1400, five built.

3 later converted to P-1A and one re-engined with the Curtiss V-1570-1 as the XP-6.

XP-3

Radial-engined version, one converted from a P-1A with 390 hp (291 kW) Curtiss R-1454 engine, later converted to XP-3A.

XP-3A

XP-3 re-engined with a 410 hp (306 kW) Pratt & Whitney R-1340-1

XP-21

XP-3A re-engined with the Pratt & Whitney R-985 Wasp Junior.

P-3A

Model 34N - five production aircraft to the AT-5A design with a 410 hp (306 kW) Pratt & Whitney R-1340-7.

XP-4

P-1A modified with a supercharged 510 hp (380 kW) Packard 1A-1530 engine.

XP-5

P-1A version with a 435 hp (324 kW) Curtiss V-1150-3 engine.

P-5

Model 34L - four built, same as XP-5 later modified with the Curtiss D-12F engine.

XAT-4

Model 34J - P-1A re-engined with a 180 hp (134 kW) Wright-Hispano E as an advanced trainer.

AT-4

Production version of the XAT-4, 40 ordered, first 35 were converted in 1929 to P-1Ds with the Curtiss D-12 engine, and the remainder completed as AT-5s.

AT-5

Model 34J - five aircraft originally to AT-4s re-engined with a 220 hp (164 kW) Wright J-5, later converted to P-1Es.

AT-5A

Model 34M - 31 aircraft based on the P-1B with a lengthened fuselage, later converted to P-1Fs.

CO-X

the first XPW-8 prototype was converted into a two-seat observation aircraft.

All variants increased in weight with each succeeding model, resulting in slight reductions in performance with each.