Hmm the OS .55 ax is about $160 new... I'm tracking down a friend that may sell me a Super Tigre .51 for a lot less while I wait for parts to arrive... [&:]

I tried the sim with the 2-bladed prop option. The stock motor then gives a pretty good pull. I'll venture a guess that to get unlimited vertical you need thrust > weight of plane which is about 7.5 pounds.... hmm...