I had the opportunity to hear a renesis motor on a Jabaru yesterday. It had
NO muffler at all and made less noise than a Lyco.  I was expecting to be
deafened but I was extremely impressed with the note.

I was standing about 12 feet to the side at one point and when the pilot
revved it up to 4000rpm I was standing at the tail holding it down and the
noise was not overly loud.  The cowls were off at the time so I imagine that
it would be even quieter with them on.

The white wrapping on the exhaust pipe is some old asbestos wrap.

Greg


That exhaust wrap is very dangerous. First; the rotary exhaust temperature
and frequency is higher so it is very hard on metal pipes. Two; it is difficult
to inspect for cracks. Not recommended. We have had a couple
of crashes for this reason.