Editing Aircraft engine (section)

==Fuel==
Refineries blend Avgas with [[tetraethyllead]] (TEL) to achieve these high octane ratings, a practice that governments no longer permit for gasoline intended for road vehicles. The shrinking supply of TEL and the possibility of environmental legislation banning its use have made a search for replacement fuels for [[general aviation]] aircraft a priority for pilots’ organizations.<ref>{{cite press release|url=http://www.eaa.org/communications/eaanews/pr/011207_lawrence.html |title=EAA'S Earl Lawrence Elected Secretary of International Aviation Fuel Committee |url-status=dead |archive-url=https://web.archive.org/web/20130303034122/http://www.eaa.org/communications/eaanews/pr/011207_lawrence.html |archive-date=March 3, 2013 }}</ref>

[[Model aircraft]] typically use [[nitro engine]]s (also known as "glow engines" due to the use of a [[Glow plug (model engine)|glow plug]]) powered by [[glow fuel]], a mixture of [[methanol]], [[nitromethane]], and lubricant. Electrically powered model airplanes<ref>{{cite web|url=http://www.nitroplanes.com/rtf.html|title=Electric Airplanes - RTF|website=www.nitroplanes.com}}</ref> and helicopters are also commercially available. Small [[multicopter]] [[UAV]]s are almost always powered by electricity,<ref>{{cite web|url=https://www.amazon.com/Photography-Drones-Store-Buying-Guide/b?ie=UTF8&node=13407343011|title=Amazon.com: Photography Drones Store: Buying Guide: Electronics|website=Amazon}}</ref><ref>{{cite web|url=http://www.nitroplanes.com/quadcopters.html|title=RC Quadcopters|website=www.nitroplanes.com}}</ref> but larger gasoline-powered designs are under development.<ref>{{cite web|url=http://www.gizmag.com/yeair-hybrid-two-stroke-combustion-quadcopter-drone/37713/|title=Yeair! hybrid gasoline/electric quadcopter boasts impressive numbers|website=www.gizmag.com|date=27 May 2015 }}</ref><ref>{{cite web|url=https://hackaday.io/project/1230-goliath-a-gas-powered-quadcopter|title=Goliath – A Gas Powered Quadcopter|website=hackaday.io}}</ref>
<ref>{{cite web|url=http://www.industrytap.com/heavy-lifting-quadcopter-lifts-50-pound-loads-its-a-gas-powered-hulk-hlq/2182|title=Heavy Lifting Quadcopter Lifts 50 Pound Loads. It's a Gas Powered HULK (HLQ)|website=Industry Tap|date=2013-03-11}}</ref>