Vertipedia - Sikorsky YH-18A (S-52-2)

Operated by the US Air Force.

Overview

Data on design, manufacture and status

Design authority: Sikorsky Aircraft Corp.

Primary manufacturer: Sikorsky Aircraft Corp.

Parent type: Sikorsky S-52

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: TBA 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:	8.36 m	27.4 ft
Overall Width:	10.06 m	33.0 ft

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: 96 mph (154 km/h)

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:
Never Exceed Speed:
Service Ceiling:	6,767 m	22,201 ft

Range and Endurance
Max Range:	467 km	252 nm
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	Franklin 6V6-245-B16 reciprocating
Manufacturer:	Franklin Engine Company

Normal Ratings
Max continuous:
Take-off / rated:	183 kW	245 hp
Intermediate:
Maximum:

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

Main Rotor Characteristics
Diameter:	10.06 m	33.01 ft
RPM:
Direction of Rotation:	Counterclockwise
Hub Type:

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

Main Rotor Derived Characteristics
Disc Area:	79.49 m²	855.6 ft²
Disc Loading:
Solidity:

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

Tail Rotor Characteristics
Diameter:
Configuration:	Unblocked
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 & Autogyros of the World

Paul Lambermont, Anthony Pirie
Cassell & Company Ltd., 1959 (page 380)
Book

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Related Public Resources

Resources related to the YH-18A (S-52-2), provided by public sources across the internet.

Publicly-funded resources provided by the US Government

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Public resources provided by select scholarly and academic sources

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Number of engines:	1 Reciprocating
Max Level Flight Speed:
Max Range:	467 km	252 nm
Max Endurance:

Main Rotor Diameter:	10.06 m	33.01 ft
Max Gross Weight (ground):