In 1999, I started making a 4m diameter propeller to push me along on my paraglider. I can't find any pictures of me flying on it, but here is one from June 2005, testing it out of the window in the workshop. I didn't fly the one in this picture, but I did a flight with an earlier design and just about maintained altitude. It was awkward to carry up the hill and I couldn't launch from the flat, so I had some occasions where I drove all the way to a hill, carried it up in two loads, lauched, which was tricky, and then found that engine wasn't working properly. My dad did all the clever metalworking and engineering.
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