A lightly built Kangaroo will fly just fine off of a grass field. We proved this several years ago with Richard’s first turbine plane. We took a regular Roo kit and lowered the turbine (then a RAM 500), ala Hot Spot. I emphatically insisted that Richard build it light (he Monokoted everything instead of glassing). It worked out very well. I used to fly it off of our 400 foot medium-rough grass filed regularly. This weekend, Scott Luna asked me to maiden his brand new Roo with an MW-54 Mark III (14 lbs of thrust, I think) off of pavement. It went very well and flew great. He too lowered the engine like Richard’s. Scott’s is not the original Roo but the ARF kit. I am not certain (perhaps some of you know) but I think they may have moved the main gear forward, closer to the CG. When taxing back, at the end of a flight, the Roo would sometimes fall on it’s *****. This, of course, keeps weight off of the nose fear during takeoff (combined with the lower thrust line) to prevent Roo squirrliness and allows a quicker rotation (will assist BIG TIME in grass field ops). I have little doubt that Scott's plane would get off of a rough grass field in 200 feet. Keep it light!!!