Rotary flyers:

 

I did a couple of searches in the archives but couldn't really find the answer I was looking for so will post it here (sorry if this has be flogged in the past).

 

I have a collector that is a 2 inch. OD pipe (from Burns SS I think), and it is fed by two 2 inch pipes coming from my exhaust manifold.  My question is what are you guys (who have been flying for a while) finding works well as I proceed downstream?  Should I keep it at 2 inches as I run it to a muffler, or should it be increased it size in an attempt to slow it down, decreased in size, etc.  prior to hitting the muffler.  I have yet to decide on a muffler so also am wondering if this is something I will have to attempt to build myself; or have some you had good luck by now with a certain brand? 

 

I think I read a while back that some of "decreased" the pipe size slightly as it comes out of the muffler (to the tip) and that reduced noise a bit and didn't really effect performance...is that true?  

 

Thanks for any inputs!

 

Doug Lomheim

13B / RV-9A

 

P.S.  Had good turn out at our EAA sponsored Burger Burn and beautiful weather...but only one guy actually flew in...maybe Dennis / Mark / Bobby / Bill E. will be able to come up for visit next year!  :)