Japanese bicycle maker Shukuno Rintendo made some crazy bikes in the late '90s. From Today and Tomorrow: "They produced a special series of power assisted bicycles, 2 of them were the Fire Trick Bob and the Water Trick Bob. The Fire Trick Bob had a small turbine which produced 4.4 horsepower of thrust. The water and air tanks of the Water Trick Bob could generate enough thrust for 50 meters." I found two more examples in the "power assist" section of their website. Yup, that's a propeller on the last one.
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