FYFT SR-series unmanned blimps are Chinese UAVs developed by Qingdao Co., Ltd. Fei-Yu (meaning Flying Universe) Aviation Science and Technology Co., Ltd. (FYFT, 青岛飞宇有限公司), and these unmanned blimps are named after their respective length. For example: if an SR4 series blimp is 11 meter long, then it is named SR4-1100, because 11 meter is equal to 1100 milimeter. SR-series UAV are intended to be research platforms, with SR standing for "Scientific Research".
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SR1-series unmanned blimps
SR1-series unmanned series blimps are FYFT-developed blimps with a single gasoline-powered tractor engine propelled by a two-blade propeller.
SR2-series unmanned blimps
SR2-series unmanned series blimps are FYFT-developed blimps with a single gasoline-powered pusher engine propelled by a two-blade propeller.
SR3-series unmanned blimps
SR3-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines, one in the front, and one aft.
SR4-series unmanned blimps
SR4-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines propelled by a two ducted fans.
SR5-series unmanned blimps
SR5-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines propelled by a two adjustable ducted fans.
SR6-series unmanned blimps
SR6-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines propelled by a two adjustable ducted fans, and it is a development of earlier SR5-series UAV.