C5-5 worked well in a baseball field with surrounding mature trees. Blue Origin didn't get too high or drift away -- three successful launches/recoveries. Not so for the Mars Destination, which went much higher, and we lost it to the trees after launch three -- it went A LOT higher than the Blue Origin, even though this was the recommended low-end engine. The kids had a blast but were very bummed out to lose one of their favorites (another one has been ordered). Next time, we will use B6-4 engines in the Mars Destination to keep the drift to a minimum.