Top Alcohol refers to two different classes in professional drag racing: Top Alcohol Dragster and the Top Alcohol Funny Car. Commonly known as "alky" cars, both are akin in design to the premier Top Fuel classes, but less powerful. In both classes, the cars are either supercharged ("blown") engines, burning alcohol (methanol) or can burn nitromethane and be normally aspirated, fuel injected engines. Top Alcohol Dragsters and Funny Cars resemble their nitromethane (Fuel) counterparts, with about half the power of their respective classes. Each car uses a three-speed transmission.