I was involved in a team to build and race two “ Human Powered Racing” machines, supported by Halfords. One was a recumbent tandem, known as Black Horse, in which we placed two world class sprinters ( Trevor Bull and Paul Sydenham) as it was a straight line sprint event. It was very fast( and won).
The other machine was a standard tandem, but with a plastic tube and transparent polythene “ greenhouse “ over it. It was much faster than an unfaired machine.