Scrapheap Challenge - Season 3 - Eps 4: Windmill
The Techno-Teachers go up against The Manic Mechanics to see who can harness the forces of Mother Nature and build a windmill to power a machine crucial to life as we know it — a coffee grinder! One team constructs a conventional fan-bladed windmill, while their opponents go for a vertical-axis Savonious rotor. Quick on-screen sketches reveal which is best for which wind conditions. But a half-hour before the competition, the weather services release a gale warning, forcing one team to clip the blades off their windmill for fear of having them ripped off. But at competition time, the wind doesn't get over 2 miles per hour.
About Scrapheap Challenge

Title: Scrapheap Challenge
First Air Date: 1998-04-12
Last Air Date: 2010-06-27
Status: Ended
Rating: 6.1/10 (from 19 votes)
Language: EN
Seasons: 13
Total Episodes: 165
Network: Channel 4
Genres: Reality, Action & Adventure
Production Companies: Unknown
Synopsis
Scrapheap Challenge is an engineering game show produced by RDF Media and broadcast on Channel 4 in the United Kingdom. In the show, teams of contestants had 10 hours in which to build a working machine that could do a specific task, using materials available in a scrapheap. The format was exported to the United States, where it was known as Junkyard Wars. The US show was also produced by RDF Media, and was originally shown on The Learning Channel. Repeats have aired on another Discovery network, the Science Channel.
Cast

Robert Llewellyn

Lisa Rogers

Dick Strawbridge