Instructables
Picture of LEGO helicopter main & tail rotor blades
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 If you love LEGOs as much as I do, then you will like these gear-activated main/tail rotor blades to put on a LEGO helicopter. To turn the blades you have to turn the red handle. I call it ''FFFFFFFFUUUUUUUNNNNNNN''!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!