The Hirth F-33 is a single cylinder, two stroke, carburetted aircraft engine designed for use on ultralight aircraft, including powered paragliders and ultralight trikes. It is noted for its extremely light base weight of 35 lb (16 kg).
The Hirth F-23 is a twin cylinder, horizontally-opposed, two stroke, carburetted or optionally fuel injected aircraft engine designed for use on ultralight aircraft.
The Hirth 2702 and 2703 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines designed for use on ultralight aircraft and especially two seat ultralight trainers, single seat gyrocopters, and small homebuilts.
The Hirth 2704 and 2706 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines, with optional fuel injection, designed for use on ultralight aircraft and especially two seat ultralight trainers, single seat gyrocopters and small homebuilts.
The Hirth F-30 is a horizontally opposed four-cylinder, two-stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft and homebuilts.
The Hirth 3701 is an in-line three-cylinder, two-stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft and small homebuilts.
The Hirth 3202 and 3203 are a family of in-line twin cylinder, two stroke, carburetted aircraft engines, with optional fuel injection, designed for use on ultralight aircraft, especially two seat ultralight trainers, gyrocopters and small homebuilts.
The Zenoah G-25 is a single cylinder, two stroke, carburetted aircraft engine, with optional fuel injection, designed for use on ultralight aircraft
The Zanzottera MZ 301 is a three-cylinder, in-line two-stroke, dual ignition aircraft engine designed for ultralight aircraft.
The König SC 430 is a three-cylinder, two-stroke, single ignition radial aircraft engine designed for powered paragliders and single place ultralight trikes.
The König SD 570 is a four-cylinder, two-stroke, single ignition radial aircraft engine designed for powered paragliders, powered parachutes and single place ultralight trikes.
The JPX D-320 and D330 are a family of French twin-cylinder, horizontally opposed, two-stroke aircraft engines.
The KFM 112M is a four-cylinder, four-stroke, dual ignition, horizontally opposed aircraft engine designed for ultralight aircraft and motor gliders.
The 2si 230 is a family of single-cylinder, two-stroke, single ignition, aircraft engines that were designed for ultralight aircraft.
The 2si 460 is a family of in-line twin-cylinder, two-stroke, single ignition, aircraft engines that were designed for ultralight aircraft.
The 2si 540 and 2si 500 are a family of in-line twin-cylinder, liquid-cooled, two-stroke, dual ignition, aircraft engines that were designed for ultralight aircraft.
The 2si 215 is a family of single-cylinder, fan-cooled, two-stroke, single ignition, aircraft engines that were designed for ultralight aircraft.
The 2si 690 is a family of in-line three cylinder, liquid-cooled, two-stroke, dual ignition, aircraft engines that were designed for ultralight aircraft.
The Nelson H-44 is an American single ignition, four-cylinder, horizontally opposed, direct drive, two-stroke aircraft engine that was developed by the Nelson Engine Company for use in motorgliders.
The Nelson H-63, known in the US military designation system as the YO-65, is an American dual ignition, four-cylinder, horizontally opposed, two-stroke aircraft engine that was developed by the Nelson Engine Company for use in helicopters and light aircraft. The engine designation means horizontally opposed 63 cubic inch displacement.
