Abstract: An environmentally accommodating, reduced NOx, spark or plasma ignited, reciprocating, multi-fuel engine utilizing direct, in-cylinder water injection and an optional oxygen enriched air supply is able to operate as an ultra-lean burn, high compression ratio engine for notable power output and increased efficiency. The in-cylinder low-temperature water injection promotes numerous desirable effects. One, the in-cylinder water injection during compression stroke significantly lowers compression temperatures through the latent heat of vaporization of the liquid water to the gaseous form. The lower temperature of compression permits increased compression ratios while avoiding pre-ignition. As well, the low-temperature water injected air/fuel or enriched O.sub.2 /air/fuel mass demands less work in the compression stroke thereby increasing overall engine efficiency. The low-temperature water injection promotes increased mass flow through the engine for increased power output and efficiency.

Abstract: An environmental accommodating, reduced NOx, spark or plasma ignited, reciprocating, multi-fuel engine utilizing direct, in-cylinder water injection and an optional oxygen enriched air supply is able to operate as an ultra-lean burn, high compression ratio engine for notable power output and increased efficiency. The in-cylinder low-temperature water injection promotes numerous desirable effects. One, the in-cylinder water injection during compression stroke significantly lowers compression temperatures through the latent heat of vaporization of the liquid water to the gaseous form. The lower temperature of compression permits increased compression ratios while avoiding pre-ignition. As well, the low-temperature water injected air/fuel or enriched O.sub.2 /air/fuel mass demands less work in the compression stroke thereby increasing overall engine efficiency. The low-temperature water injection promotes increased mass flow through the engine for increased power output and efficiency.

Abstract: A separate opaque reticle display attachment for a rifle or the like equipped with a telescopic sight. The user sights through the telescopic sight with his bore axis eye while simultaneously viewing an opaque reticle display screen which is aligned with his other eye. The display includes a cross-hairs aiming reticle. Transducers gather information relative to wind velocity and direction, ambient temperature, relative humidity, target elevation, and the like, which affect the ballistic trajectory of a projectile fired from the rifle. This information along with range information is fed to a microprocessor, which adjusts the position of the cross-hairs reticle on the display for proper aiming of the rifle. The user, by simultaneously viewing through the telescopic sight with one eye and viewing the opaque reticle display with the other eye, combines or superposes the two images into a single field of vision to aim the rifle in accordance with the position of the cross-hairs reticle.