I had a chance to tach the Cox .15. I knew beforehand that Medallions have no where near the power of a TD or Conquest. Still, it's a good running little engine and would definitely fly a 2lb plane. I got close to 12,500 with an APC 8x4 on 10% fuel and just over 15,000 with an APC 7x4 and 25% fuel. The throttle actually works well. It's more of a wide open/idle type control without much midrange, but it doesn't stutter or hesitate. I don't remember what my FP .15 does, but I'm sure the FP is stronger, and a lot more quiet. The Medallion is very loud.