I finally got a chance to measure the CG location of my ESM p47. The engine is a Zenoah G38. Flies very powerfully. I didn't trust anything written on the box, or in the plans. So I recreated the wing planform in a CAD system based on actual measured points on the wing. I then figured out the 25% chord location for each station, representing the center of lift. I added them all up, and divided by the number of stations, giving me a MAC (mean aerodynamic chord) of 4.2" (106.68mm) as measured at the fuselage side. Here is the CAD file:
