Property of the Air Force Museum
Wright-Patterson Air Force Base
Ohio 45433

[Northrop Report A-56, dated 30/11/43]

Performance of the XB-35 at 155.000 LBS.

These performances are based on computations of the drag results obtained from the N9-M.

Maximum speed at military power at 35,000ft.
386 mph

Maximum rate of climb at military power
1270ft/min

Service ceiling (four engines)
39,400 ft.

Service ceiling (three engines)
23,200 ft.

Range with 10,000 lbs. of bombs

cruise altitude 35,000 ft, average speed 250 mph
4,600 miles

cruise altitude 25,000 ft. average speed-230 mph
5,100 miles

Takeoff distance to clear 50 ft.
4,800 ft.

Physical Characteristics

Wing span
172 ft.

Wing Area
4000 ft2.

Wing Aspect Ratio
7.38

Mean Aerodynamic Chord
26.3 ft.

Taper Ratio
0.25

Airfoil Sections

Root – NACA 65, 3-019
Tip – NACA 65, 3-018

Length
53.1 ft.

Height
20.28

Design Gross Weight
155,000 lbs.

Weight Empty
95,339 lbs.

Engine:

Make
Pratt & Whitney

Model Number
XR-4360-17,-21

Propeller Gear Ratio
0.381 : 1 dual rotation

Power rating:

Normal 2500 BHP at 2700 rpm S.L. to 35,000 ft.

Military and Takeoff (5 Minutes) 3000 BHP at 2700 rpm S.L. to 35,000 ft.

Propeller:

Make
Hamilton Standard

Type:
dual rotation, pusher

Number of blades
eight

Blade number
2c15B1-0, 2C15B2-0

Diameter
15' 1" (Propeller farthest from engine)
15' 1" (Propeller nearest engine)

Thickness ratio at 3/4 station
0.056