compressor stall is absolutely right. Sunfish:
500 foot stipulation gives me TIME to get things done
I took a Cessna 150 out yesterday - takes over a minute to get to 500 ft on a warm day - plenty of time to read the POH to see what I need to do after take-off. Last time I launched off in a Pitts S-1-11B it took about ten seconds to get to 500 ft and I was ready to rock and roll. I'm not James Bond, just doing a steady climb at speed for best rate of climb.