Paramotor is the generic name for the harness and propulsive portion of a powered paraglider ("PPG"). There are two basic types of paramotors: foot launch and wheel launch. Foot launch models consist of a frame with harness, fuel tank, engine, and propeller. A hoop with protective netting primarily keeps lines out of the propeller. The unit is worn like a large backpack to which a Paraglider is attached through carabiners. Wheel launch units either come as complete units with their own motor and propeller, or as an add-on to a foot-launch paramotor. They usually have 3 (trike) or 4 (quad) wheels, with seats for one or two occupants. These are distinct from powered parachutes which are generally much heavier, more powerful, and have different steering. The term was first used by Englishman Mike Byrne in 1980 and popularized in France around 1986 when La Mouette began adapting power to the then-new paraglider wings. Power plants are almost exclusively small two-stroke internal combustion engines, between 80 cc and 350 cc, that burn a mixture of gasoline and oil. These engines are favored for their high thrust-to-weight ratio of engine plus fuel; they use approximately 3.7 litres (1 US Gal.) of fuel per hour depending on paraglider efficiency, the weight of unit plus pilot, and weather conditions. At least one manufacturer produces a 4-stroke model with better fuel efficiency, which produces strong thrust at lower rotational speeds (RPM). Electrically powered units are also made, though flight duration is limited by battery weight. Csaba Lemak built the first electric PPG, flying it first on 13 June 2006. Wankel rotary engined paramotors are also available, but rare. The pilot controls thrust via a hand-held throttle and steers using the wing's brake toggles, stabilo steering, weight shifting or a combination of the three. Unlike unpowered paragliding, launching from an elevation or catching thermal columns to ascend are not required. Paramotor wings somewhat different from free flight "paraglider" wings have evolved; such wings are typically designed for a higher speed and may incorporate a "reflex" profile to aid stability in pitch, an idea taken from hang gliders of the 1980s, and developed and pioneered by British designer Mike Campbell-Jones. Paramotor wings typically use trimmers to adjust the angle of attack of the wing to decrease or increase speed. Trimmed out allows the pilot to achieve maximum speed, while trimmed in allows slower speeds, required for launching