FYFT S-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 S1 series blimp is 11 meter long, then it is named S1-1100, because 11 meter is equal to 1100 centimeters. S-series UAV is intended for aerial survey / photography / cinematography, with S stands for Survey.
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S1-series unmanned blimps
S1-series unmanned blimps are FYFT-developed blimps with a single gasoline-powered tractor engine propelled by a two-blade propeller.
S2-series unmanned blimps
S2-series unmanned blimps are FYFT-developed blimps with a single gasoline-powered pusher engine propelled by a two blade propeller.
S3-series unmanned blimps
S3-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines, one in the front, and one aft.
S4-series unmanned blimps
S4-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines propelled by a two ducted fans.
S5-series unmanned blimps
S5-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines propelled by a two adjustable ducted fans.
S6-series unmanned blimps
S6-series unmanned blimps are FYFT-developed blimps with twin gasoline-powered engines propelled by a two adjustable ducted fans, and it is a larger cousin of earlier S5-series UAV from which it is developed from.
S7-series unmanned blimps
S7-series unmanned blimps are FYFT-developed blimps with a single gasoline-powered engines propelled by a single adjustable ducted fan.