ORIGINAL: Gungadin
I have the ES30G pipe. When I measure from the front edge of the pipe to the baffle, I get 16-1/2'' approx. OR 18''. I found that if you use a piece of 1/4'' square balsa to stick down the pipe it will go down farther and therefore the 18'' dim. I first used a 3/8'' square piece of balsa and came up with the 16-1/2 dim. So depending what dia. you stick down the pipe, willl get you an 1-1/2'' different dimension. Seems to be two baffles in the pipe. Also my Macs OS 140 header is 7-15/16'' from the flange face to the end of the header. Hope this helps Rick.
Guys,
Rick (RC11) communicated with Ed Skorepa. It turns out the 30G is different than mine in its baffle placement. Ed said to Rick that the 30G has the baffle installed 16.5" from the stem. I didn't know that since Ed stated to me that my version of the 40G pipe was being offered as the 30G. He never mentioned that he changed the location of the baffle on the 30G. The baffle in mine is located at 17" from the stem
Regardless, the measurements we have discussed, hold.
Dan, the first baffle is the right one. It's a disc actually with a large hole in the middle. The wave reflects off this disc to produce the super charging effect, on the pipe perimeter. The baffle behind this one also reflects but at lower frequency. They both establish resonance in the pipe starting at fairly low rpm and continue to resonate to high rpm. The second baffle is more complete block than the first...it has an exhaust hole off center, discharging into the aft section which really settles down the noise generated
Matt
Hey guys BTW, who was the guy who is planning an EF extra 300? Decided to buy one of these myself. I hope the weight comes in as advertised at 11.5 lbs. With a 1250 sq inch wing it should fly light. SAP up front of course
BTW, anyone interested in a NIB OS160 with a muffler?