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A comment on Zipline: Drone delivery of medical supplies. Parent comment
https://en.wikipedia.org/wiki/Valveless_pulsejet
Fuel can be either gravity fed or possibly a pressurized system (e.g. fill the deadspace in the tanks with compressed nitrogen)
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https://en.wikipedia.org/wiki/Valveless_pulsejet
Fuel can be either gravity fed or possibly a pressurized system (e.g. fill the deadspace in the tanks with compressed nitrogen)