Bob,
Is there a chance that the remaining portion of your fiberglass tunnel is available for purchase or scrounging? Like you, I cut my tunnel longer and would like to make an extension. Using your leftovers will be easier than molding my own. That is if you can entertain my request. Thanks.
David
David, you would be welcome to it, but there isn't much left because I had to use the center and aft bits for the forward part under the landing gear. I goofed when making the first one because I didn't take into account the LG bolts and ended up hacking up the section and simply re-cut with another piece because I had plenty. If I have to do it again, I will figure out a way to do it with 1/16" balsa sheet.
In any event, if you use the stock tunnel with the ES pipe, the pipe is going to stick way out on the bottom of the plane. It is a bit of a challenge to reshape the formers and make the tunnel (channel, actually) wider and deeper and line it with 1/16" balsa sheet, but well worth the effort. The blue Ultracote color for covering the is mentioned somewhere in the thread.