Download and share free model airplane and boat plans. featuring thousands of radio control, control line and free flight freely downloadable plans, 3views and blueprints for model builders.. Enjoy our free go kart, snowmobile, and atv plans. build your own unique kart plans.. Warp drive airboat and hovercraft turbo propeller prices with hp blades. note: the price for the turbo propeller includes the nickel leading edges, faceplate and the mounting bolts ! a protractor to measure and set blade pitch is also included. this model of propeller makes less noise and is more efficient in converting horse power into thrust over most of the useable propeller rpm range due.