Airboat. power: vw beetle air cooled engine, driving an airplane-type propeller. can the hull be extended or shortened? up to 10% by re-spacing the frames from the aft end of the stem to the transom a proportional amount. we do not recommend increasing the beam. trailer: designed for use with glen-l series 650 boat trailer plans.. Airboat: airboat, a mixture of airplane and boat with the resultant thrills of both. of course it is a boat powered by an airplane type propellor with large above the water rudders. but what boat is capable of skimming over a few inches of water and vegetation? only an airboat.. How to build an airboat. find a plan. basic plans to build an airboat are available from outfits like lake buggy airboats website. here you can choose from single seat and two seat plans. obtain an airboat engine and propeller. some folks have used lawnmower engines and some have used turbine engines to power their airboats..