I am preety sure that most of them run a dual prop set-up that poisition the props side-by side. Thats why the red boat that loses a prop goes right and keeps accelerating; its only spin one prop. The first video shows a picture perfect run of a boat thats set up well. The way that boat takes a set and keeps pulling is really nice. The problem with these boats is that a lot can go wrong very quickly (so quickly the driver cannot react) and the results can be catastrophic. Years ago they didn't run saftey capsuals and the mortality rate was the highest in motrsports. Now, they are much safer and much quicker than back then.