Charlie P and Grey Beard, and others, have it right. 150' length should be fine. The Stik should take 40-50' to take off in zero wind, depending on engine and prop. My Ultra Stik has a 70 4-stroke, and gets off in 30-40 feet. 2" grass will slow it quick on landing. Only a few grasses will tolerate 1", that's putting-green stuff.