Considering that helicopters are entirely dependent on a spinning rotor to remain in the air, an MH-60S Seahawk doesn't exactly seem the most likely candidate for experimental fuel. That didn't seem to stop the US Navy, however, which successfully completed a test flight with a 50 / 50 blend of algae-based biofuel and Jet A (traditionally the flavor of choice for turbine-based aircraft). The mixture used is known as Solajet HRJ-5 Jet fuel, which doesn't quite have the same ring to it as good ole Jet A -- but it does happen to be based on a renewable resource and managed to keep the rotor spinning. There's no word on how much the new fuel costs to produce or whe