Gene: Yeah, there are differences and it seems that every time there is a sensitivity to noise, someone will show up with a large scale that makes a lot of noise.

BUT, a couple years ago, a member of long standing, showed up with a flying wing that has set several records for speed. It was a flying wing type aircraft with a small engine.. I don't know what size it was, but .40 size seems to come to mind. He has a tuned pipe on the thing and a very small prop. It was launched by a sling-shot type of device and took some time to climb to altitude.

Once up at about 100 feet, he pushed the throttle to full.. we thought it was full when he launched it.. and did a rather large turn as it sped up.

He went way to the east, slowly turned in toward the field and, at about 50 feet, went across at slightly over 200 miles per hour. We had a police RADAR so we were able to read the speed as he passed by.

The noise that thing made was piercing, and very loud. He estimated the engine RPM at somewhere around 20,000.. and I can believe that.

He made three orbits, each at somewhere around 200 miles per hour. His top speed was 203 mph. We could hear the ripping sound as it echoed back from the woods about 500 yards away. He freely admitted that it was mostly prop noise, but there was some exhaust noise.... BUT, I gotta admit, it was pretty thrilling. Very impressive, no doubt about it.

CGr.