ORIGINAL: p-80
thats unfortunate maby they could modefy them in the future not being able to use the 4 strokes is a huge bummer im willing to bet that 40,s would be ideal but underpowerd in my opinion
Here is a video of the Twin Otter with two .36 Evolutions. Seems to do real well with this setup.
http://vimeo.com/10170101