Rotax is on track to certify and begin deliveries of its 915 iS engine in 2017, the company said.

“We’ve got pretty good experience with these engines,” said Marc Becker, head of aviation engines for Rotax, whose four-cylinder models have logged more than 50 million flight hours. “We think we know what we’re doing.”

https://www.aopa.org/news-and-media/.../july/26/rotax

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And with one, how fast will a SeaRey cruise?