Model Land yacht sail car diy from kit

Tiny land yacht using parts from an old solar car. I first tried at home with a handheld fan and it quite worked. I was getting frustrated but before throwing it all away, I decided to try outside. Great idea you see. This thing flies!! Not windy at all, just breezy. Have a look at the water coming towards the camera... Sail is made from a very thin fridge bag. You can glue it. I instead used a thermal sealing device to make a tube to insert the bbq skewer. The wheels are cheap plastic and very slippery, so I put some thin rubber bands. I bet the neck of a party balloon will work even better. A cork with an indentation is all it takes to clamp the sewing string and set the angle of the boom.