RE: PROFI RAMBLER .049
MJD, do not forget that you could also visit the MACA forum to find plans for a up to date 1/2A combat plane design. On 42 foot lines these planes are within anyone's abilities to fly. With a low pitch prop...most definitely.
I built a C/L combat plane for the Fora .049 [95% the power of a Cyclon] and was mildly disappointed with it on 42 foot lines. It performed OK and had plenty of pull, but it was like flying a sport .40 on 60 foot lines.
"Old rules" 1/2A combat was on 35 foot lines.... a much smaller hemisphere. A Cyclon or Profi on 35 footers is totally bananas. It was what made me "retire" from 1/2A C/L...it was just stupid and it took years to get the rules changed.