Aviation fuel

Aviation fuel is a specialized type of petroleum-based fuel used to power aircraft. It is generally of a higher quality than fuels used in less critical applications, such as heating or road transport, and often contains additives to reduce the risk of icing or explosion due to high temperature, among other properties.

Most aviation fuels available for aircraft are kinds of petroleum spirit used in engines with spark plugs (i.e. piston and Wankel rotary engines), or fuel for jet turbine engines, which is also used in diesel aircraft engines.

ASTMLS

Fuels have to conform to a specification in order to be approved for use in type certificated aircraft. The American Society for Testing and Materials (ASTM) developed specifications for automobile gasoline as well as aviation gasoline. These specifications are ASTM D910 and ASTM D6227 for aviation gasoline and ASTM D439 or ASTM D4814 (latest revision) for automobile gasoline.

Production of aviation fuel

The production of aviation fuel falls into two categories: fuel suitable for turbine engines and fuel suitable for internal combustion engines. There are international specifications for each.

Single (football)

In Canadian football, a single (single point, or rouge), scoring one point, is awarded when the ball is kicked into the end zone by any legal means, other than a successful field goal, and the receiving team does not return, or kick, the ball out of its end zone. It is also a single if the kick travels through the end zone or goes out of bounds in the end zone without being touched, except on a kickoff. After conceding a single, the receiving team is awarded possession of the ball at the 35-yard line of its own end of the field.

Singles are not awarded in the following situations:

In all these cases the defending team is awarded possession of the ball at the 25-yard line.

In the United States, singles are not usually recognized in most leagues and are awarded only in matches played under the auspices of the National Indoor Football League (formerly United Indoor Football) and the now-defunct American Indoor Football Association. It is applied only on kickoffs in both leagues, and is scored if the receiving team fails to advance the ball out of the end zone when kicked. The NIFL also allowed a single to be scored by kicking a kickoff through the uprights (as in a field goal); this type of single is nicknamed (and has since been codified in the NIFL rules as) an uno, from the Spanish word for the number one. At one point, the Philadelphia Public League (the public high school football sanctioning body in Philadelphia, Pennsylvania) awarded three points for kicking a kickoff through the uprights.