The Aeromarine K-6 is an aircraft engine built by the Aeromarine Plane and Motor Company in 1915.

It is an Aeromarine 90hp with a .571 reduction gear.

The addition of the reduction gear allowed the engine to produce more power by operating at a higher RPM.

This engine made its peak power of 100 hp at 2000 rpm[1][2][3] Data from Airplane Engine Encyclopedia[2]