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.
Dan, if you shine a light in there, you can see the little gaps on the sides of the baffle that are part of the design. I would guess that the 18" measurement went past the baffle.
How is the hard mount coming along? Did you have an opportunity to start on the pipe tunnel? How is the overall quality and fit of your Focus? GOOD I hope!!
As I mentioned before, if it seems a bit of a struggle, keep the faith because in the end it is an excellent flyer. I have not yet flown a top-shelf pattern ship, but I have taken the sticks of some nice 35-40% aerobats (and my "dinky" 30% AW Yak) and this plane handles crosswinds and holds a line better than anything I have flown. I had heard this is true of good pattern ships, but to experience it first-hand is a real epiphany. My buddy Anthony R told me this evening at our club meeting that he thinks I am officially a pattern addict!