flyover, therewsas a lot of discussion of the wood bar dyno on the site years ago. I made one for our LEU Treehugger and there was once a set that was being loaned around for general use.
To use to get a traditional dyno graph, you have to make a series of bars to load the engine across a range. Then, run each bar at full throttle and note the rpm. Using the program you can derive the HP for that particular rpm. Then change the bar to another and repeat. You should then be able to plot the rpm/hp points on a graph and get a dyno curve. The more different sized bars, the more data points. Crude, but should give a reasonable idea of the engine capability.
We found our half VW had 29 hp at 3390 rpm (used only one size bar). We never got to 3390 rpm when using the prop, so our engine was developing less than 29 hp during TO and flying, and was only barely adequate when the wind/weather was good.