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Description: Designed and built for the Helicopter event at the 1952 Northern Heights Gala.

It was inspired by the article on Jetex helicopters by F.G. Boreham in the Jan. 1951 issue of Aeromodeller. The design followed many of the details presented in that article, using a large diameter rotor at right angles to a shorter beam that carried a Jetex motor at each tip. The rotor blades were designed to auto rotate using the "delta 3 " concept of angled hinges near the root (as described by Boreham), which allowed the rotor to swing up, but the rotor blade incidence gradually became negative in the process.

Rotor Diameter 72 in.
Motors 2 Jetex 350s
Airframe weight without motors 4.3 oz.
Total weight with empty motors 9.5 oz.

It flew well in calm conditions, typically giving a 1 minute flight in evening air, using 3 charges in each motor. It was easy to launch by hand, but was very difficult to launch from rest, sitting on a launch pad, as was required at the Northern Heights Gala. The weather at the Gala was very gusty and the model was wrecked soon after launch, due to being tipped sideways by the wind.
Keywords: whirligig helicopter twin jetex 350 bill henderson
Date: 11.03.2021 01:49
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