;VAT S-52-3:Prototype of the Hummingbird family, converted from an original
Sikorsky S-52-3. ;Hummingbird 260L :Version powered by a six cylinder, air-cooled,
four-stroke,
dual-ignition Lycoming IVO-435 engine ;Hummingbird 300LS :Version powered by an eight cylinder, liquid-cooled, four-stroke, single-ignition
General Motors LS7 V-8 automotive conversion engine, derated to ;Hummingbird 300L :Version powered by a six cylinder, air-cooled,
fuel injected Lycoming IO-540 derated to ==Specifications (Hummingbird 300L) ==