The dimensions of the vehicle must also be considered. The automobile
has limitations on size depending, first of all, on an allowable road width of 8 feet. After that, size depends on whether it is a luxury automobile, a compact car, or something in between.
It is the span of the wings that normally takes up most of the width of an aircraft, but actually, it is possible to build an aircraft with no wings at all. Such an aircraft could be built using vectored thrust, ducted fans, and rotors. These are, of course, Vertical Take-Off and Landing aircraft.
If you insist on having a wing, it is possible to build one with a span of only eight
feet to accomodate the width limitation imposed on road vehicles. However, performance may be affected in a variety of ways. The span can be increased by using folding or telescoping wings that may be extended, or by using attachable wings. There are advantages and disadvantages to all of these possibilities.