Vertipedia - McCulloch MC-4 (YH-30)

Developed in 1951. Type certificated, three were ordered by the U.S. Army and designated YH-30.

Overview

Data on design, manufacture and status

Design authority: McCulloch Motors Corp, Aviation Division

Primary manufacturer: McCulloch Motors Corp, Aviation Division

Parent type: No type defined

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 2 in Tandem (Fore/aft) configuration

Crew required: 2 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

Overall Dimensions
Overall Height:
Overall Length:
Overall Width:	7.01 m	23.0 ft

Airframe Dimensions
Airframe Length:	9.88 m	32.4 ft
Airframe Width:
Airframe Height:	2.77 m	9.1 ft

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:

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

Cruise Speed: 85 mph (136.794 km/h)

Weights
Max Gross Weight (ground):	1,043 kg	2,300 lb
Max Gross Weight (airborne):
Max Take-off Weight:	1,043 kg	2,300 lb
Empty Weight:	726 kg	1,600 lb
Useful Load:	318 kg	700 lb
Empty Weight Fraction:	0.696

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	169 km/h	91 kts
Never Exceed Speed:
Service Ceiling:	3,048 m	10,000 ft

Range and Endurance
Max Range:	322 km	174 nm
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	Franklin 6A4-200-C6 reciprocating
Manufacturer:	Franklin Engine Company

Normal Ratings
Max continuous:
Take-off / rated:	149 kW	200 hp
Intermediate:
Maximum:

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

Main Rotor Characteristics
Diameter:	7.01 m	23.00 ft
RPM:
Direction of Rotation:	Counter-rotating
Hub Type:

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

Main Rotor Derived Characteristics
Disc Area:	38.60 m²	415.5 ft²
Disc Loading:	13.51 kg/m²	2.768 lb/ft²
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:
Blade Construction:	N/A
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 334)
Book

S-47 | S-47/R-4 Helicopter

Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 8)
Website
Very thorugh description and details of the R-4 series helicopter

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Number of engines:	1 Reciprocating
Max Level Flight Speed:	169 km/h	91 kts
Max Range:	322 km	174 nm
Max Endurance:

Main Rotor Diameter:	7.01 m	23.00 ft
Max Gross Weight (ground):	1,043 kg	2,300 lb
Useful Load (calculated):	318 kg	700 lb