Hirobo

Lore & Background

Hirobo began as a textile machine manufacturer named Hiroshima Spinner, Limited in October 1949. In 1957, it partnered with Nichibo Company to form Hiroshima Synthetic Fiber Spinners Limited, later known as Unitika Limited. The company changed its name to Hirobo Limited in 1970, and its electronics division was established in April 1973. Production of radio-controlled models began in July of that same year. By October 1977, Hirobo had completely withdrawn from the textile market.

In 1983, Hirobo applied its helicopter expertise to produce 1/10-scale, four-wheel-drive offroad buggies. The first was the innovative 44b off-road car, which was the first to feature a four-wheel-drive system. Subsequent models included the technologically advanced Alien Mid4, Jealousy, Invader, and the Ashura, the only belt-drive 4WD 1/12 circuit car ever produced. All used a Gilmer belt for the 4x4 system, an innovation nearly unheard of at the time, as most 4x4 cars of the period used a noisy, power-robbing metal chain.

Despite these advances, Hirobo cars were very expensive, limiting their exposure to racers. They were also often plagued with poor build qualities and the use of cheap materials. Additionally, distribution in the important North American market was weak. These factors led to Hirobo's withdrawal from the RC car market.

Reader's Guide

Hirobo's significance lies in its dual legacy as a leader in radio-controlled helicopters and as an innovator in RC car technology. The company's helicopter line spans all price ranges, including coaxial-bladed indoor Sky Robo helicopters in both radio-controlled and tethered configurations, maintaining its reputation for quality. In the car market, Hirobo introduced the first four-wheel-drive off-road buggy with the 44b, and pioneered the use of Gilmer belt drive for 4x4 systems, a quieter and more efficient alternative to metal chains. However, the high cost of its cars, combined with inconsistent build quality and weak North American distribution, prevented widespread adoption and ultimately caused Hirobo to exit the car market. The company's car models—such as the Alien Mid4, Jealousy, Invader, and Ashura—remain notable for their technical ambition but are remembered as commercial failures. Hirobo's continued focus on helicopters, from entry-level to high-end, has sustained its position in the RC industry.

Did You Know?

• Hirobo was founded in October 1949 as a textile machine manufacturer named Hiroshima Spinner, Limited.
• The company's first four-wheel-drive off-road car, the 44b, was introduced in 1983.
• Hirobo's 4x4 cars used a Gilmer belt drive instead of the metal chains common at the time.