Labels:brass | bulletin board | monitor | rock | sky | tree OCR: PREV The first problem facing helicopter inventors was creating an engine light and strong enough to fly one Then they had to worry the effect which made the fueselage or body of the helicoptor in the opposite direction 04 the blades. They also had 04 worry that the helicopter would flip over thanks 04 the unequal lift LESSONS HELP MXET about torque OOPTS
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