# Brock KB-2

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Brock KB-2 Freedom Machine Ken Brock at Oshkosh 2001 General information Type Autogyro National origin United States of America Manufacturer Ken Brock Manufacturing Designer Ken Brock History First flight 1970 Developed from Brock KB-1 Gyroplane

The **KB-2 Freedom Machine** is an [autogyro](/source/Autogyro) designed by Ken Brock based on the designs of the [Bensen B-8](/source/Bensen_B-8).[1][2]

## Design and development

Ken Brock was an early innovator in homebuilt gyrocopters starting with his first ride in 1957.[3] Brock set to work on building and marketing a series of homebuilt gyroplanes with the KB-1 and later the KB-2.[4]

## Operational history

Ken Brock used his KB-2 design for years in airshow acts and completed several world records. In 1971 he completed the first coast-to-coast autogyro flight from [Long Beach, California](/source/Long_Beach%2C_California) to [Kitty Hawk, North Carolina](/source/Kitty_Hawk%2C_North_Carolina).[5]

## Variants

**KB-2**
- Powered variant

**KB-2G**
- Variant with the same frame and rotor head as a KB-2. The "glider" is a two-seat gyroplane designed to be towed by car. The aircraft with the same frame and rotor assembly can be converted to a powered gyroplane.[6]

## Aircraft on display

A 1970 demonstrator KB-2 is in the [EAA Airventure Museum](/source/EAA_Airventure_Museum) in [Oshkosh, Wisconsin](/source/Oshkosh%2C_Wisconsin)

## Specifications (KB-2)

*Data from* EAA

**General characteristics**

- **Capacity:** 1

- **Empty weight:** 240 lb (109 kg)

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

- **Powerplant:** 1 × [McCulloch 4318](/source/McCulloch_Motors_Corporation) , 90 hp (67 kW)

- **Main rotor diameter:** 2 × 12 ft (3.7 m)

**Performance**

- **Cruise speed:** 61 kn (70 mph, 110 km/h)

- **Range:** 520 nmi (600 mi, 970 km)

- **Rate of climb:** 1,900 ft/min (9.7 m/s)

## See also

**Aircraft of comparable role, configuration, and era**

- [Bensen B-8](/source/Bensen_B-8)

- [Midwest Hornet](/source/Midwest_Hornet)

- [Taggart Gyrobee](https://en.wikipedia.org/w/index.php?title=Taggart_Gyrobee&action=edit&redlink=1)

- [Wallis WA-116 Agile](/source/Wallis_WA-116_Agile)

## References

Wikimedia Commons has media related to [Brock KB-2](https://commons.wikimedia.org/wiki/Category:Brock_KB-2).

1. **[^](#cite_ref-1)** ["Brock KB-2 Gyroplane"](https://web.archive.org/web/20110719095750/http://museum.eaa.org/collection/aircraft/Brock%20KB-2%20Gyroplane.asp#TopOfPage). Archived from [the original](http://museum.eaa.org/collection/aircraft/Brock%20KB-2%20Gyroplane.asp#TopOfPage) on 19 July 2011. Retrieved 29 March 2011.

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

1. **[^](#cite_ref-3)** Henry Doering (1980). [*Book of buffs, masters, mavens, and uncommon experts*](https://archive.org/details/bookofbuffsmaste00doer).

1. **[^](#cite_ref-4)** "Good Gyrations". *Popular Science*. November 1998.

1. **[^](#cite_ref-5)** *Popular Mechanics*. Nov 1971. {{[cite journal](https://en.wikipedia.org/wiki/Template:Cite_journal)}}: Missing or empty |title= ([help](https://en.wikipedia.org/wiki/Help:CS1_errors#citation_missing_title))

1. **[^](#cite_ref-6)** *Popular Science*. February 1982. {{[cite journal](https://en.wikipedia.org/wiki/Template:Cite_journal)}}: Missing or empty |title= ([help](https://en.wikipedia.org/wiki/Help:CS1_errors#citation_missing_title))

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

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