The aircraft has removable wings, with single locking pins and quick-disconnect controls which can be easily hooked up and inspected from inside the cockpit. The wings have conventional Frise ailerons and slotted flaps. The elevator and rudder are also conventional. Ailerons and elevator are controlled by dual centre-mounted sticks through push-pull tubes, while the rudder is controlled by cables. The rudder cables attach to the rudder by wrapping around the wide bottom diameter of the rudder itself. The pitot tube is mounted on the left-hand strut. The flaps are operated by a ceiling-mounted flap handle with detents for 0, 15 and 30 degrees of deflection. The flaps are controlled directly with the handle attached to a flap centre-section behind the fuselage and the wing flaps plug into the flap centre-section. Flaps are normally set to 15 degrees for takeoff and 30 degrees for landing. The plane comes in one colour – white, but owners can add their own vinyl decals to finish the plane as desired. Fuel capacity The fuel tank is located behind the right-hand seat. The quantity can be read directly through a sight gauge behind the seat. The standard tank is 70 litres (18 US gallons) with 87 litres (23 US gallons) optional. Behind the left-hand seat is a small baggage compartment, with additional baggage space above and behind both seats. Powerplant The 3X55 powerplant options are the Rotax 912UL, the 912ULS or the Jabiru 2200. The standard fuel is premium auto fuel, but it can run on 100LL as well. The 3X55 can be equipped with either a three-bladed, fixed pitch Czech-made Woodcomp wood/fibreglass SR 200 propeller or an electrically adjustable Woodcomp SR 2000 propeller, with an optional constant speed unit. Landing gear The main landing gear consists of sprung fibreglass gear legs with 5X5.00 tires as standard on graphite wheel rims. Larger 6X6.00 tires are optional. The nose gear is a single-fork design also made from fibreglass. Nose gear suspension is a compressed rubber donut system. Competition history Krzysztof Wieczorek won the 16th FAI World Precision Flying Championship in 2004 and took the 3rd place in the 14th FAI World Rally Flying Championship in 2004 flying 3Xtrim aircraft. In the 17th FAI World Precision Flying Championship in 2006, 3Xtrim took the 1st (Krzysztof Wieczorek) and 3rd (Krzysztof Skrętowicz) places. Specifications (550 Trener) See also Notes References Hunt, Adam: Flying the 3Xtrim 3X55, COPA Flight, October