Northrop YRB-49 Data Table


General

 

Usage

 

Prototype

 

 

Construction

 

Aluminum

 

 

Motor type

 

Six Allison J-35 A-19 Turbojet Engines

 

 

Power

 

6 x 5,600 lbs thrust

 

Dimensions

 

Span

 

172 ft (52.4 m)

 

 

Length

 

53.08 ft (16.2 m)

 

 

Height

 

20.28 ft (6.2 m)

 

 

Aspect Ratio

 

7.4:1

 

 

Taper Ratio

 

4:1

 

 

Incidence

 

0 deg at root chord
-4 deg at tip chord

 

Dihedral

 

0o 53' at Leading Edge

 

 

Wing Thickness

 

85.5 inches at root chord

 

 

Sweep

 

26o57'48" LE
10o15'22" TE

Airfoil Section

 

M.A.C

 

315" (210" Aft Sta 0) (CG @ 35.4% MAC)

 

 

R.C. NACA 65,3-019
T.C. NACA 65,3-018
R.C. 37.5 ft (11.4 m)
T.C. 9.33 ft (2.8 m)

 

Track

 

41.2 ft

 

 

Wheelbas e

23.5 ft

 

 

Wheel Size

 

Main Gear: 65 " Diameter @ 70 psi
Nose Gear: 56" Diameter @ 75 psi

Areas

 

Wing (total)

 

4000 ft2 (371.6 m2)

 

 

Elevon

 

182.3 ft2 (16.9 m2) each

 

 

Rudder

 

Trim flap box 36.4 ft2 (3.4 m2) each
Trim flap 89.0 ft2 (8.3 m2) each
Upper and lower rudder 52.6 ft2 (4.9 m2) each

Control Movement

 

Aileron

 

Trim Flaps 30o up, 7.5o down

 

 

Rudder

 

0-60o open (split drag rudders)

 

 

Elevator

 

35o up, 25o down

 

 

Flaps

 

50o down

 

Weights & Loadings

Empty

 

95,339 lbs (43,336 kg)

 

 

Gross

 

168,150 lbs (76,430 kg)

 

 

Overload

 

225,296 lbs Max Fuel (102,192 kg)
225,244 Max Bombs (102,169 kg)

 

Wing Loading

 

38.8 lb/ft2 (920.7 kg/m2)

 

 

Power Loading

 

12.9 lb/HP (38.1 kg/kW)

 

 

Disposible Load

 

12,811 lbs Normal (5,811 kg)
129,958 Max Fuel (58,948 kg)
129,906 Max Bomb (58,924 kg)

Capacity

 

Crew

9 Normal, 6 Relief

 

 

Fuel

 

8000 Gal Normal
10,000 Max Bombs
18,000 Gal Max Fuel

 

Oil

 

340 Gal Normal
600 Gal Max
10 Gal Supercharger

Powerplant

 

Type

 

Four Pratt & Whitney RR4360-17/21 Wasp Major (2 ea)

 

No. of Cylinders

 

28

 

 

Power

 

3000 HP ea (2237 kW)

 

 

Bore

 

5.75 inches (14.6 cm)

 

 

Stroke

 

6 inches (15.2 cm)

 

 

Displacemen t

4263 in 3 (70 l)

 

 

Compressio n

6.7:1

 

 

Propeller

 

Hamilton Std 8 Blade Coaxial
183 inch Fwd. Diameter
181 inch Aft Diameter

Armament

 

 

Twenty .50 Calibre machine guns - 1000 rounds/gun

 

 

 

32-1600 lb bombs

 

Maximum speed

 

 

520 mph @ 30,000 ft