In The Immunity Syndrome, Helena and Maya use a re-entry glider to enter the corrosive atmosphere of an alien planet. The design closely resembles a NASA design called the Hyper III, tested at the Dryden Flight Research Center in 1969.
The Hyper III was built as a remotely piloted scale model (32 foot/ 9.7m long) which flew just once, in December 1969. It was a "stiletto-shaped lifting body" with flat bottom and sides, designed for high speed re-entry and manoeuvrability. The fixed wings simulated a "pop-out wing". It was one of a family of lifting body shapes that were studied by the Flight Research Center. NASA information and photos
Below: the Hyper 3, restored by Ray Burgess, as seen at Castle AFB, California, 1993. Photographs thanks to Dana Lubich.
The model was built by Martin Bower in two scales. The smaller version is seen on top of the 44" Eagle. The larger version is seen in close-up on an enlarged section of the Eagle spine, and is crashed across sand dunes and into trees. It is 85cm long and made of 6mm thick perspex to withstand the crash sequence. There is a large hole in the lower part of the back, for a mounting rod.
Space 1999 images copyright ITV Studios Global Entertainment
Page and model images copyright Martin Willey