Hi,As I mentioned in another post, sometimes it's the small things that makes all the difference in terms of enjoyment.Bill and Lynn have done it again! The City Challenger Two Ultralight is great to look at and a joy to fly. I have only just begun to explore the delights they have, once more, carefully prepared for all of us :).One little thing I noted straight off, however, is a brief click (not really a click, just a gap in sound) audible at regular intervals as you run the Rotax engine full pelt. This appears to be caused by a small pause at the end of the 'ro4a.wav' wavefile (found in the QCC_Classic and QCC_Float sound folders), so each time it recycles you hear this click/gap.The solution is simple: First make a copy of the aforementioned file, then...Open said file in a sound file editor like Creative Lab's Creative WaveStudio and cut out the gap at the end of the file before saving the modified file over the original.Then go fly.For me it makes all the difference and I'm not ashamed to say so....is that truly sad or not? ;) Mike

yep, I noticed exactly the same thing and solved it in exactly the same way. :) The Challenger is such a great little bird with such an immersive VC that it just seems like a crime for such a tiny issue to detract from the experience... :)