The JetPack includes a four-cylinder V-engine "V4" that uses the 2-stroke cycle and it has 2 liters of displacement to deliver 200 HP at 6,000 rpm. See Martin Aircraft.

“Martin JetPack's V4 engine”

-Clearly we see the double ignition by the two spark plugs in each cylinder head and the turbocharger in the center of the cylinder V.

-This engine is intended for a unique vehicle, a kind of personal lift-up with two small ducted fans as we see below.

“Two views of the Martin JetPack”

“JetPack personal lift system” (PiP=ps)

From Appendix 11: The JetPack has been designed by Glenn Neal Martin of New Zealand. Not to be confused with Glenn L. Martin of the USA.