Vertipedia - Brantly B-2B

Overview

Data on design, manufacture and status

Design authority: Brantly International Inc.

Primary manufacturer: Brantly International Inc.

Parent type: No type defined

Aircraft status: Operational

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

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

See the Dimensions section of the Specifications page

Overall Dimensions
Overall Height:	2.11 m	6.9 ft
Overall Length:	8.53 m	28.0 ft
Overall Width:	7.24 m	23.8 ft

Airframe Dimensions
Airframe Length:
Airframe Width:
Airframe Height:	2.11 m	6.9 ft

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:	2.08 m	6.8 ft

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

Weights
Max Gross Weight (ground):	758 kg	1,670 lb
Max Gross Weight (airborne):
Max Take-off Weight:	758 kg	1,670 lb
Empty Weight:	485 kg	1,070 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:	Lycoming IVO-360-A1A reciprocating
Manufacturer:	Lycoming Engines

Normal Ratings
Max continuous:
Take-off / rated:	134 kW	180 hp
Intermediate:
Maximum:

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

The inboard part of each blade (inboard of the outer articulation hinges) is set at an angle of incidence 4 degrees higher than the outboard part of the blade. The inboard flapping hinge was 2.67" from rotor center and the outboard flapping hinge at 51.85".

Main Rotor Characteristics
Diameter:	7.24 m	23.75 ft
RPM:	454.7 rpm	454.7 rpm
Direction of Rotation:	Counterclockwise
Hub Type:	Doubly articulated blade with I/B and O/B flap hinges

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:	0.203 m	0.67 ft
Blade Tip Geometry:	Conventional
Blade Twist:
Number of Blades:	3

Main Rotor Derived Characteristics
Disc Area:	41.16 m²	443.0 ft²
Disc Loading:	18.41 kg/m²	3.770 lb/ft²
Solidity:	0.0536

Main Rotor Blade Derived Characteristics
Blade area per blade:	0.74 m²	7.9 ft²
Tip Speed:	172.34 m/s	565.4 fps

The blade is tapered with a tip chord of 2.703" and a root chord of 4.187"

Tail Rotor Characteristics
Diameter:	1.30 m	4.25 ft
Configuration:	Tractor
Direction of Rotation:	Top blade fwd
RPM:	2800 rpm	2800 rpm

Tail Rotor Blade Characteristics
Number of Blades:	2
Blade Construction:
Blade Chord:	0.069 m	0.23 ft
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	1.32 m²	14.2 ft²
Solidity:	0.0675

Tail Rotor Blade Derived Characteristics
Tip Speed:	189.92 m/s	623.1 fps
Blade Area (per blade):	0.044 m²	0.48 ft²

References

References and sources used

B-2B Aircraft Specifications

Brantly International
Brantly Aircraft web site, April 2016 (page 7)
Website
The data on this site is copyright Brantly International but can be used if credit is given to the source

FAA Type Certificate Data Sheet No. 2H2

Federal Aviation Administration
FAA TCDS web site, August 14, 2002
Website
TCDS covers all Brantly models

Progress Report on the Brantly B-2 Helicopter

Frank A. Erickson
AHS NEWSLETTER - May 1958, May 1958
Periodical
This newletter is available from the AHS web site under 'Vertiflite'. The data in this report is equally applicable to the Brantly B-2B as stated on the the Brantly International web site (http://www.brantly.com/engrg.htm)

The Twin-Engine BO-105

A.C. Ballauer and P. F. Sheridan
VERTIFLITE August 1969, August 1969
Periodical
Good description of the overall vehicle