Schweizer Aircraft developed the Model 330 and 333 prior to the company's acquisition by Sikorsky in 2004. The 330 was developed from the company's piston-powered Model 300. The 330 and the improved ...
The civil version of Sikorsky’s S-434, an upgraded version of the Schweizer 333 with the four-bladed main rotor from the Fire Scout UAV, is in flight test having made its maiden hop on Dec. 18, 2008.
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