Vertipedia - Bell XH-12

A 5-place helicopter developed in 1947 for the USAAF.

Overview

Data on design, manufacture and status

Design authority: Bell Helicopter Textron, Inc.

Primary manufacturer: Bell Helicopter Textron, Inc.

Parent type: Bell Model 47

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 1 in Side-by-side arrangement

Landing gear: Wheels (non-retractable)

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Primary Control Device

Overall Dimensions
Overall Height:
Overall Length:
Overall Width:

Airframe Dimensions
Airframe Length:
Airframe Width:
Airframe Height:

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:

Cabin Dimensions
Cabin Internal Height:
Cabin Internal Length:
Cabin Internal Width:

Cruise Speed: 160.934 km/h

Weights
Max Gross Weight (ground):	2,404 kg	5,300 lb
Max Gross Weight (airborne):
Max Take-off Weight:	2,404 kg	5,300 lb
Empty Weight:	1,658 kg	3,655 lb

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:
Never Exceed Speed:
Service Ceiling:

Range and Endurance
Max Range:
Max Endurance:

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines:	1
Designation:	P&W R-985 reciprocating
Manufacturer:	Pratt & Whitney

Normal Ratings
Max continuous:
Take-off / rated:	336 kW	450 hp
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:
OEI 30-second:
OEI intermediate:

Main Rotor Characteristics
Diameter:	14.48 m	47.50 ft
RPM:
Direction of Rotation:	Counterclockwise
Hub Type:

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:
Blade Tip Geometry:
Blade Twist:
Number of Blades:	2

Main Rotor Derived Characteristics
Disc Area:	164.63 m²	1772.1 ft²
Disc Loading:	14.60 kg/m²	2.991 lb/ft²
Solidity:

Main Rotor Blade Derived Characteristics
Blade area per blade:
Tip Speed:

Tail Rotor Characteristics
Diameter:
Configuration:	Pusher
Direction of Rotation:	Top blade fwd
RPM:

Tail Rotor Blade Characteristics
Number of Blades:	2
Blade Construction:
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:
Solidity:

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):

References

References and sources used

Helicopters from "A to Z" | Part I

Ralph P. Alex
AHS Newsletter, 1961, October, 1961 (page 7)
Periodical

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Number of engines:	1 Reciprocating
Max Level Flight Speed:
Max Range:
Max Endurance:

Main Rotor Diameter:	14.48 m	47.50 ft
Max Gross Weight (ground):	2,404 kg	5,300 lb