Thanks to all that answered. I forgot that I could rig the the whole airplane for some speed at some power setting, Joe helped put some actual numbers on it. I am used to cranking the trim handle on my Stinson to set for a specific speed and adjusting that smooth Franklin power for climb, cruise or descent. The other way of course is to set the throttle to a specific power output percentage via the tach and then trim for cruise, and this condition is where I figured trim would come in handy. Now I see it's in the rigging. thanks, dale