It is not really a laughing matter, I have worked on motor cycles , snow mobils and model engines most of my life and have some hearing loss and problems caused by sound wave to othe parts of my ! Well . A head set or ear plugs untill you have tuned and have the plane on the run way helps. And if you don't care AAAAAAAAAA What DID YOU say. Sorry I did not hear you start you engine, was that you I bumped into. Only about 40 stitches!!!!!!!! Did I do that.