Why do the Wydra tires work as a propeller?

I tried to figure out why Wydra wheels can make the car float forward, but while I was changing the values of jbeam, I broke the game Do you guys know what exactly are the values contributing to this?

 

it's the skinDragCoef value of the tire, combined with buoyancy stuff in the chassis to make it float

 

it turns out that if you put a SkinDragCoef on any tire, it will also be able to move the car through the water? the funny thing is that the game broke down exactly when I thought of removing this parameter from the code

 

you probably introduced a syntax error, no reason it wouldn't work, and yes any car could move along the water with enough skindragcoef BUT it needs to float first, and that's not the wheel's job, the chassis of the wydra itself is buoyant