Editing Hybrid-propellant rocket (section)

===High power rocketry===
There are a number of hybrid rocket motor systems available for amateur/hobbyist use in high-powered model rocketry. These include the popular HyperTek systems<ref>{{cite web |title=HyperTEK – The easiest access of them all |website=hypertekhybrids.com |url=http://www.hypertekhybrids.com}}</ref> and a number of 'Urbanski-Colburn Valved' (U/C) systems such as RATTWorks,<ref>{{cite web |title=RATTworks: Precision hybrid & tribrid rocket motors |website=rattworks.net |url=http://www.rattworks.net}}</ref> Contrail Rockets,<ref>{{cite web |title=Contrail Rockets Hybrid Rocket Motors |website=contrailrockets.com |url=http://www.contrailrockets.com/}}</ref> and Propulsion Polymers.<ref>{{cite web |title=初売りで流行のアイテムを入手しよう｜人気のおしゃれグッズ |website=propulsionpolymers.com |url=http://www.propulsionpolymers.com}}</ref>
All of these systems use [[nitrous oxide]] as the oxidizer and a plastic fuel (such as [[Polyvinyl chloride]] (PVC), [[Polypropylene]]), or a polymer-based fuel such as [[HTPB]]. This reduces the cost per flight compared to solid rocket motors, although there is generally more ground support equipment required with hybrids.