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Bayern-Chemie GmbH and Protac S.A. Developer and manufacturer of rocket and airbreathing propulsion systems, including hypervelocity and special use engines. Site also provides company history and profile, news, review of technologies, and related links. http://www.bayernchemie-protac.com/
Compact Radial Engines Manufactures and distributes radial, boxer and inline aircraft engines for experimental, PPG and ultralight aircraft. http://www.compactradialengines.com/
Crossflow Aero Corporation Converting Subaru automotive engines for experimental aircraft. [requires Flash] http://www.crossflow.com/
DeltaHawk, Inc. Designing a new two-stroke diesel engine aimed at the general aviation market. http://www.deltahawkengines.com/
Eggenfellner Aircraft LLC. Producing firewall forward engine packages based on a Subaru automotive engine conversion. http://www.eggenfellneraircraft.com/
EPI, Inc. Design and development of piston engine technology and systems, specializing in aircraft V8 engines and propeller reduction gearboxes. http://www.epi-eng.com
Firewall Forward Manufacturer of Honda Civic based aircraft engines as well as propellor speed reduction units and ignition systems. http://www.firewall.ca/
Kreisler Manufacturing Corporation Manufactures precision metal components and assemblies for use in military and commercial aircraft engines. (Nasdaq: KRSL). http://www.kreisler-ind.com/
Limbach Flugmotoren German manufacturer of the Limbach aircraft engine. [Flash required] http://www.limflug.de/
Mallen Research Corporation ultra-efficient aeroengines for unmanned aerial vehicles and other performance-critical sectors. http://www.mallenresearch.com/
MTU Aero Engines Manufacturer providing development, production and maintenance services for civil and military aero engines and industrial gas turbines. http://www.mtu.de/
Pratt and Whitney Leader in the design, manufacture, and support of turbine engines. http://www.pratt-whitney.com/
Simonini Flying Two stroke engines for paramtors. http://www.simonini-flying.com/
Textron Lycoming Major manufacturer of general aviation piston engines. http://www.lycoming.textron.com/
Universal Turbine Parts Pratt and Whitney Canada approved supplier of PT6, JT15D, and PW100 engines and components. http://www.utpparts.com
VW Engines Producing the RG2000 aircraft engine along with associated accessories. http://www.vw-engines.com/
Willis Lease Finance Corporation Acquires and provides commercial aircraft spare engines in the aftermarket and purchases and resells used and refurbished commercial aircraft engines and airframe and engine components. (Nasdaq: WLFC). http://www.willislease.com/
Zanzottera Engines Manufacturer of engines designed for ultralight and unmanned aircraft. http://www.zanzotteraengines.com/
Zoche Aero-Diesels Developing type certificated, direct drive, air cooled, radial, two-stroke Diesel engine. http://www.zoche.de/