Firestone: XR-9B

General data

Producer info

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Names and dates
Market original model designation
XR-9B
Market model designation (english translation or spelling)
XR-9B
First flight date and time
1946-03
Config info
Rotorcraft typeHelicopter
Config
Single rotor
Way of counteracting main rotor torque
Tail rotor
Weights
Maximum Takeoff Weight (MTOW)
794
kg
Manufacturers empty weight (MEW)
567
kg
Cabin and cockpit
Maximum number of people onboard
2
Cockpit seating arrangement
Tandem
Cabin type
Enclosed
External dimensions
Length
8.41
m
Width
2.74
m
Height
2.60
m
Landing gear type
Wheeled
Wheeled landing gear type
Main wheels in the back
Landing gear support points
3
Control system
Yaw control
Tail rotor
Main rotor
Cyclic pitch control
Yes
Collective control
Yes
Main rotor diameter
8.53
m
Main rotor direction of rotation
Counterclockwise
Number of blades
3
Main rotor blade tip chord
0.22
m
Main rotor blade root chord
0.39
m
Tail rotor
Tail rotor diameter
1.98
m
Tail rotor blade root chord
0.17
m
Tail rotor blade tip chord
0.10
m
Powerplant
Engine model
Lycoming O-290-7
(...)
Lycoming
Engine model (english translation or spelling)
Lycoming O-290-7
(...)
Lycoming
Engine type
Piston
Number of engines
1
Total maximum power
135
HP
Fuel system
Fuel tank capacity
95
l
Performance
Maximum horizontal flight speed (Vh)
169
km/h
Cruise speed (Vc)
129
km/h
Best rate of climb
5.1
m/s
Maximum service ceiling
3048
m
Maximum range
402
km
(...)
443
km
Maximum flight endurance
3
h
0.0717