Tier 1 Testing Certifiable Electric Propulsion Conversion For R44

Bird 2 is Tier 1’s prototype for the eR44 certified electric propulsion conversion.
Credit: Tier 1 Engineering
Having flown a Robinson R44 light helicopter modified to electric propulsion in 2016 as a proof of concept, Tier 1 Engineering is beginning ground tests of its certifiable power train conversion. The original conversion was focused on replacing the R44’s Lycoming IO-540 piston engine with dual...

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