A maker known as Integza built a rim-driven jet engine where miniature rocket nozzles along the fan's edge spin the blades, with the fan levitating on a high-pressure gas bearing. Prototyped first in acrylic with compressed air, the full version used a brass combustion chamber burning propane. Thermal expansion caused the aluminum fan to seize in its housing, requiring anodizing for heat resistance and water injection into the combustion chamber to manage exhaust temperatures. The engine ultimately worked, though its thrust advantage over a plain rocket nozzle remains uncertain.
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