15 Most Unusual Flying Vehicles in the World That's Crazy! That's Weird! Ever since the Wright brothers proved that it was possible for heavier than air machines to fly, engineers have been trying to develop designs that make flight easier and more efficient. There are several basic principles that you’ll be familiar with from widely used aircraft that almost appear to be essential, but the reality is that there’s a range of different techniques that can be used to generate the lift required. It’s time to push the boundaries of what you thought was possible, as we take a look at the 15 most unusual flying vehicles.