Aerotech Consumer Aerospace
(rocket motors)

BME Engines
(giant scale motors)

Brison Aircraft Giant Scale Motors
(giant scale motors)

Byron Fuels

Cactus Aviation
(distributor of 3W motors and giant scale kits)

FHS Supply
(Red Max fuels and oils)

FOX Manufacturing Company
(FOX engine series)

Golden West Models, LLC
(manufacturer of the JetCat self-starting turbine for R/C model aircraft - no compressed air or fan required, with integrated ECU)

Horizon Hobby Distributors
(MDS, Saito, Webra, Zenoah engine series)

K&B Manufacturing
(engines)

Morgan Fuels
(manufacturer of "Cool Power" fuels)

MVVS Engines

Norvel
(small RC engines - also a great page with sounds of engines illustrating how to adjust needle valve settings)

O.S. Engines

Paragon Aeronautics
(precision assembly presses, Ryobi weedwacker engine conversion kits)

Performance Specialties
(Nelson engines, chrome piston/liner replacements, mufflers and other high performance stuff)

Planes Plus
(distributor - turbine aircraft kits, various motors and turbine engines, jet cockpits)

Powermaster Fuels

Quadra Aerrow
(Quadra giant scale aircraft engines)

RCV Engines
(manufacturer of the unique "rotating cylinder valve" engine series)

Reid's Quality Model Products
(Cheetah giant scale engines)

Saito
(giant scale engines - distributed by Horizon)

SimJet Turbine Denmark

SWB Turbines

Tower Hobbies
(distributor)

Trim Aircraft
(distributor - several ducted fan and turbine jet kits, and resellers of the AMT and RAM turbines)

Webra
(distributed by Horizon)

Wildcat Fuels

Zenoah
(giant scale motors - distributed by Horizon)