Vertipedia - Lockheed XH-51A (4 blade configuration)

This is the aircraft in a 4 main blade configuration, employed to resolve high vibration issues with the earlier configuration

Overview

Data on design, manufacture and status

Design authority: Lockheed-California Company

Primary manufacturer: Lockheed-California Company

Parent type: Lockheed CL-595

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: Skids (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:

Weights
Max Gross Weight (ground):
Max Gross Weight (airborne):
Max Take-off Weight:
Empty Weight:

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	374 km/h	202 kts
Never Exceed Speed:
Service Ceiling:	6,100 m	20,013 ft

Range and Endurance
Max Range:	440 km	238 nm
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	P&WC PT6B-9 turbine
Manufacturer:	Pratt & Whitney Canada

Normal Ratings
Max continuous:
Take-off / rated:	410 kW	550 hp
Intermediate:
Maximum:

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

Main Rotor Characteristics
Diameter:	10.67 m	35.00 ft
RPM:
Direction of Rotation:	Unknown
Hub Type:

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:
Blade Tip Geometry:
Blade Twist:
Number of Blades:	3

Main Rotor Derived Characteristics
Disc Area:	89.38 m²	962.1 ft²
Disc Loading:
Solidity:

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

Tail Rotor Characteristics
Diameter:
Configuration:	Unknown
Direction of Rotation:	Unknown
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):

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Resources related to the XH-51A (4 blade configuration) , provided by public sources across the internet.

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Images

Overview

Attribution

Number of engines:	1 Turbine
Max Level Flight Speed:	374 km/h	202 kts
Max Range:	440 km	238 nm
Max Endurance:

Main Rotor Diameter:	10.67 m	35.00 ft
Max Gross Weight (ground):