Cross between an aluminum race car, hot air baloon, and air plane

I purchased a 1918 Maytag washing matching (one of the first electric powered models) and I found inside the washing machine, what I believe to be a wind powered car of some kind. The car is aluminum with two holes at the top and two on the sides. A wire is connected from one hole to the other at the side of the car and whatever was inserted into the top holes is missing. There are cutouts at the grill and beneath the cars belly to minimize drag. A plane like rear rudder/fin makes up the tail. Completely hollow at the interior with no indications that there were ever any parts or components there prior. No markings at all. The tires are rubber mounted on a rim which attaches to the axle using threaded connections, which I thought was interesting. Based on the wire set up and the drag cutouts I believe the car was designed to move using wind or some other unconventional method. ANY HELP in identification would be greatly appreciated.