Chris Engler
Active Member
I'm in the process of adapting a Whirlwind 15 inch spinner to a Sensenich ground adjustable composite prop and would like to check spinner runout (I'm using the Showplanes cowl that requires a 15 inch spinner). Are there any issues with spinning the engine (Superior XP 400) using the starter without the prop blades attached? If this is feasible, should I remove one set of plugs from each cylinder to reduce compression and allow the engine to spin faster?