Equipped to float with impermeable canvas skirts, these tanks were to propel themselves to the beach with an AD hoc propellor and then resume normal operation.
Once it has arrived at the airport and enters onto the tarmac, it can fold down its electrically powered wings, engage its rear-facing propellor and take off down the runway.
The daily flight between Belgrade and Sarajevo takes 45 minutes to cover the 200-odd kilometres; it would be quicker in a plane that was not propellor-powered.
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