For years the answer was, "Well, brand XYZ offered one but they disappeared from the market some years ago. One such winner I flew was the 
Quicksilver is now more stable than it's been since the very beginning back in the late 1970s. That's because in the last ownership shift, Bever and family bought the whole shebang. They purchased everything except the GT500 but covering the entire product line from the MX or Sprint/Sport series to the single seat GT400. It took several semi-truck loads to bring it all from southern California to Reserve, Louisiana.
Their rescue of the Quicksilver line and preservation of the brand was warmly received by the legions of 'Quick' enthusiasts. Well beyond 15,000 Quicksilver models have been delivered, making the brand one of the most successful marques in all of aviation. To my knowledge, only Van's Aircraft has delivered more kits to pilots.
Air Tech, Inc., has a broad product and. service capability. They have all the original Quicksilver parts, many accessory items (never produced by Quicksilver, Inc.), and can aid repair on any Quicksilver model.
Air Tech, Inc., mainly sells kits but they do own the Special LSA credential for the Sport S2SE, making this popular aircraft a proper training aircraft to fly the rest of their line. A buyer of the SLSA model is permitted to offer paid flight instruction and rental of the aircraft under LSA regulations.
Aero 1000 is an adaptation of a junior-Indy car race engine. The base powerplant is manufactured by 
https://youtu.be/piMISKNVvcU
If I hear one thing over and over it is this: “I want a four-stroke engine for my Part 103 ultralight. Are any available?” For years the answer was, “Well, brand XYZ offered one but they disappeared from the market some years ago. One such winner I flew was the Bailey four-stroke out of England. However, a visit to their website recently was not very productive. Regretfully, other four-stroke powerplants are rare (although for slightly larger airplanes, Chip Erwin’s V-Twin will soon add to the choices). Are you out of luck trying to obtain a Part 103 four-stroke? NOPE! Aero 1000 Engine Fine Swiss Engineeering Air-Tech, Inc., is one of my favorite companies. While I love the people behind this Louisiana company, it isn’t their deep expertise, long experience, or even an endearing sense of humor that surrounds the Bornes — a father and son team to envy.
With more than 15,000 flying, it even outranks Van's Aircraft for kit aircraft that made it into the air — although Van's has sold more kits in total and no one disputes the Western brand's leadership position.
The earliest Quicksilvers were hang gliders (last photo). Engines came later but at first the weight-shift seat stayed (nearby image). The pilot had lateral control — still by weight shift — but via lines that moved surfaces. Pitch, however, was fully controlled by the pilot moving his or her body.
Those were fun days and provided wonderful memories (yes, I flew them as weight-shift aircraft). Yet the brand went on to vastly greater development. In this article, our focus is on the original three-axis control model, the oh-so-famous MX (multiple axis).
The MX model abandoned the weight shift idea — this was too foreign to lots of potential customers. Instead, it used stick-and-rudder two-axis controls, but with a difference. The joystick connected to the elevator and rudder while the rudder pedals were connected to spoilerons on top of the wing.
