I would like to propose a battery powered plane for unmanned missions. The design I propose would have slightly more range for the given battery capacity. The key is to put the heat generated during flight into good use.
The plane will not have a classical tubular fuselage. Instead, the tubular form would be open on both ends. In the front there will be a propeller that generates the main thrust of the plane. The duct shape of the fuselage will increase the efficiency of the air propelled by guiding it.
The main motor of the plane will have tubular form to have minimal drag behind the propeller. The electronics and the battery of the plane will be mounted behind it in tubular form as well. These parts will be aerodynamically covered with heatsinks. As a result, the air flowing inside the tube would be slightly heated by the inefficiencies of the motor, its driver and the batteries. It’s like a turbofan engine. Instead of heat generated by combustion, the energy lost and turned into heat is partially recovered as additional thrust.
This design leaves almost no room for a payload, therefore it can only be used on surveillance planes which require minimal payload.
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