To date, aircraft APU's (auxiliary power units) have been the almost exclusive luxury of the "heavy iron" commercial jets, and medium / large business jets. Imagine if, for the first time, the tremendous benefits of safety and utility of these larger APU's could be provided for the majority of all private and military airplanes and helicopters, ranging in size from piston singles and utility turboprops all the way up to midsize business jets -- in an lightweight and compact, ultra-quiet, reliable, simple-to-operate, "green" (low emissions), and affordable package. Consider the potential of next-generation APU capabilities:      •  Runs from onboard aircraft fuel -- no external electrical connections       •  Compatible with all aviation fuel types      •  Ground power for dependable engine starts      •  In-flight backup power supply (incl FAR 135 for single turboprops)      •  Cabin pre-cool or pre-heat before boarding      •  Confident operation out of airports lacking GPU's (ground power units)      •  By far the quietest APU ever designed (barely audible)      •  Rapid piston engine pre-heat in winter      •  Full electric power to 20,000' (with startup to higher altitudes)      •  Rapid APU cold startup down to -58°C (-72°F) OAT      •  Sealed, oil-free systems with no maintenance to 3500 hr TBO      •  Additional safety factor for modern glass panels avionics      •  May even be run in enclosed hangar area for limited time      •  Net empty weight SAVINGS when compared with backup battery Welcome to Mallen Research Corporation.