Broomstickpilot they are photocopies of the original Blackburn manual but I am relying on a memory that has been prven wrong before! Using the same memory, isn't the Cirrus I rated at 90 hp and the II / IIA at 100hp? My Minor II still pulls the required 2,050 rpm for the run up and comes pretty close to the book climb / cruise figures so it should be producing fairly close to it's rated horsepower.