Try the Eflite Power 25 and 40 Amp ESC that is used in the T-34. I have the same setup in the Twin Otter, and they work pretty well, though they do drain the 3300 mah 3S packs fairly quickly. Recommended prop is a 12x6, so if that prop is too large for the Wunder, step it down to a Power 25 that is used in the Apprentice.