Good morning,
It sounds the same as a default one, but goes really fast. I'll try to make a video and post it, but I seem to have trouble uploading to youtube. Most of the time it doesn't work for me, and I have to retry several times. I'll let you know if I get one posted.
I've tweaked the trike to go about 180 mph, and can also stop very fast. I can climb straight up at 135 mph! If I come in for a landing with the parking brake on, it will stop in about 15 feet. So I can land on those little tiny islands, no problem. As long as I touch down on land. It is very fun to fly. I never thought of changing the sound files. Hmm, what sounds should I choose?