# Brock KB-3

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American gyroplane

KB-3 General information Type Autogyro National origin United States Manufacturer Ken Brock Mfg Designer Ken Brock Status Production completed Number built 200 (2005) History Manufactured 1985-2005 Introduction date 1985 Developed from Brock KB-2

The **Brock KB-3** is an American [autogyro](/source/Autogyro) that was designed by [Ken Brock](https://en.wikipedia.org/w/index.php?title=Ken_Brock&action=edit&redlink=1), produced by [Ken Brock Mfg](/source/Ken_Brock_Mfg) and introduced in 1985. The aircraft was supplied as a kit for [amateur construction](/source/Homebuilt_aircraft) and was also available as plans.[1][2]

## Design and development

The KB-3 was derived from the 1970 KB-2 and specifically designed to comply with the US [FAR 103 Ultralight Vehicles](/source/FAR_103_Ultralight_Vehicles) rules, including the category's maximum empty weight of 254 lb (115 kg). The aircraft has a standard empty weight of 250 lb (113 kg). It features a single main rotor, a single-seat open cockpit without a windshield, [tricycle landing gear](/source/Tricycle_landing_gear) and a twin cylinder, liquid-cooled, [two-stroke](/source/Two-stroke), dual-ignition 64 hp (48 kW) [Rotax 582](/source/Rotax_582) engine in [pusher configuration](/source/Pusher_configuration).[1]

The aircraft [fuselage](/source/Fuselage) is made from bolted-together [aluminum](/source/Aluminum) tubing. Its 22 ft (6.7 m) diameter rotor has two blades. Factory available options included a main rotor pre-rotator, a rotor brake and an instrument package. Fuel capacity is 5 U.S. gallons (19 L; 4.2 imp gal) and is housed in a combination pilot seat/fuel tank.[1]

Due to its small size and light weight the KB-3 is easy to transport by trailer and can be set up to fly in ten minutes.[1]

## Specifications (KB-3)

*Data from* Cliche and Kitplanes[1][2]

**General characteristics**

- **Crew:** one

- **Length:** 12 ft 0 in (3.66 m)

- **Empty weight:** 250 lb (113 kg)

- **Gross weight:** 600 lb (272 kg)

- **Fuel capacity:** 5 U.S. gallons (19 L; 4.2 imp gal)

- **Powerplant:** 1 × [Rotax 582](/source/Rotax_582) twin cylinder, liquid-cooled, [two-stroke](/source/Two-stroke) dual-ignition [aircraft engine](/source/Aircraft_engine), 64 hp (48 kW)

- **Main rotor diameter:** × 22 ft 0 in (6.71 m)

- **Main rotor area:** 380 sq ft (35 m2)

**Performance**

- **Maximum speed:** 63 mph (101 km/h, 55 kn)

- **Cruise speed:** 60 mph (97 km/h, 52 kn)

- **Range:** 100 mi (160 km, 87 nmi)

- **Service ceiling:** 10,000 ft (3,000 m)

- **Rate of climb:** 1,200 ft/min (6.1 m/s)

- **Disk loading:** 1.58 lb/sq ft (7.7 kg/m2)

## References

Wikimedia Commons has media related to [Brock KB-3](https://commons.wikimedia.org/wiki/Category:Brock_KB-3).

1. ^ [***a***](#cite_ref-Cliche_1-0) [***b***](#cite_ref-Cliche_1-1) [***c***](#cite_ref-Cliche_1-2) [***d***](#cite_ref-Cliche_1-3) [***e***](#cite_ref-Cliche_1-4) Cliche, Andre: *Ultralight Aircraft Shopper's Guide* 8th Edition, page F-3. Cybair Limited Publishing, 2001. [ISBN](/source/ISBN_(identifier)) [0-9680628-1-4](https://en.wikipedia.org/wiki/Special:BookSources/0-9680628-1-4)

1. ^ [***a***](#cite_ref-KitplanesFeb2005_2-0) [***b***](#cite_ref-KitplanesFeb2005_2-1) Downey, Julia: *2005 Trikes 'Chutes and Rotorcraft Directory*, Kitplanes, Volume 22, Number 2, February 2005, page 57. Belvoir Publications. ISSN 0891-1851

v t e Ken Brock Manufacturing aircraft Ultralight aircraft Avion Gyroplanes KB-1 KB-2 KB-3

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Adapted from the Wikipedia article [Brock KB-3](https://en.wikipedia.org/wiki/Brock_KB-3) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Brock_KB-3?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.