OK, so I'll go along with 16cc Echo. My brother (former lawn mower shop guy) gave it to me. I called him today, and he thought it may have been 20cc. He hasn't seen it in a LONG time. What prop & RPM are you guys using/getting? Anyone have one flying? Somewhere around here I have a 1/4 scale Pietenpol Sky Scout (S Squared kit). It is not finished (not me...), it was supposed to run a .40 and a pound or so of weight added to the nose. This little gem might prompt me to finish it (or at least start to work on it again).
Buck, I love the tractor! How did you drive the wheels? Must be a bunch of gear reduction in there somewhere. Very cool.
Thanks for the ID, MIKE