Helicopter performance can be very deceiving. Large, fat and ungainly choppers can also be super-fast and highly maneuverable, even compared to their streamlined little cousins. The Sikorsky H-53 exemplifies this this truth with its massive six bladed rotor and large four bladed tail rotor. The video below shows the Sea Stallion going through aerobatic testing during the 1960s.
from Jalopnik http://ift.tt/1z0wZ4R
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