what type of fuel goes in a zippo
lighter fluid butane
title: Zip fuel text: general terms, boron-enhanced fuels offer up to 140% the energy density of plain JP-4 in terms of both weight and volume. In the US a whole family of fuels were investigated, and generally referred to by the names they were assigned during the Air Force's Project HEF: HEF-1 (ethyldiborane), HEF-2 (propylpentaborane), HEF-3 (ethyldecaborane), HEF-4 (methyldecaborane), and HEF-5 (ethylacetylenedecaborane). All zip fuels have a number of disadvantages. For one, the fuel is toxic, as is its exhaust. This was of little concern in flight, but a major concern for ground crews servicing the aircraft. The fuels burn to create solids that title: Zip fuel text: low-mass elements, boron has the combination of high energy, low weight and wide availability that makes it interesting as a potential fuel. Boranes have a high specific energy, about 70,000 kJ/kg (30,000 BTU/lb). This compares favorably to a typical kerosene-based fuel, such as JP-4 or RP-1, which provides about 42,000 kJ/kg (18,000 BTU/lb). They are not suitable for burning as a fuel on their own, however, as they are often prone to self-ignition in contact with air, making them dangerous to handle. When mixed with conventional jet fuels, they add to the energy content while becoming somewhat more stable. In title: Zip fuel text: canceled in 1959. It was later claimed that the Blackstar spaceplane uses zip fuel, but Blackstar is almost certainly mythical. The highest energy density fuel seen in common propellant combinations is hydrogen. However, gaseous hydrogen has very low density; liquified hydrogen has higher density but is complex and expensive to store. When combined with other elements, like carbon, the hydrogen can be rendered into the easily burnable hydrocarbon fuels. Other elements, like aluminum and beryllium have even higher energy content than carbon, but do not mix well to form a stable fuel that can be easily burned. Of all the title: Zip fuel text: was possible to burn it with relative ease in an afterburner, but this would only be effective on aircraft that used an afterburner for extended periods of time. Combined with the high cost of producing the fuel and the toxicity issues, the value of zip fuel was seriously eroded. In 1959 the Air Force cancelled the program, although some small-scale work as a rocket fuel continued. This too proved to be a dead-end, as the solid boron oxides in the combustion products interfered with the expected thermodynamics, and the thrust advantages could not be realized. Several studies were made into title: Zip fuel text: boronated fuels over the years, starting with the U.S. Army's rocket-related Project HERMES in the late 1940s, the U.S. Navy Bureau of Aeronautics's Project ZIP in 1952, and the U.S. Air Force's Project HEF (High Energy Fuels) in 1955. For much of the 1950s, zip fuels were considered to be the "next big thing" and considerable funds were expended on these projects in an effort to bring them into service. The Navy's name stuck, and all of the boronated fuels became known as "zip fuels", although the Air Force's naming for the fuels themselves became common. The main thrust of