My latest AADD side trip

Well, my work bench is still covered in stuff that I’m unpacking from the move, so I haven't done any building on the Challenger.  But I did take a couple of hours to do the bladder conversion on a Medallion .09 that I’ve been wanting to do for a couple of years.  Only took a couple of hours, but I haven’t had a project that needed it to spur me on.  It’s basically the exact same thing I did for my Medallion .049 conversion using 5/32” brass tubing and a fine needle valve assembly from a Cox postage stamp engine.  But I wasn’t motivated enough to pull out my good digital micrometer to measure the tubing, so I just held the tubing up to the NVA I pulled out from the Medallion and cut the tube to match the standard NVA length.  Then I took a file and opened up the channel in the middle to match the standard NVA.  I soldered the fine NVA into the tubing and filed the assembly smooth with my jeweler’s files.  I eyeballed it as I carefully filed the assembly, and when I was satisfied I took some coarse sand paper and sanded the assembly lengthwise to keep it from rotating in the venturi body, and then pressed it into the body.  The fit is very tight so I’m not worried about any air leaks.  










I took it to the field today to test run it, but all I had to video it was my crappy phone camera.  It’s a short clip because, well, it’s just an engine running.  Sorry it’s in that stupid YouTube shorts format.  But it was too short for me to bother firing up the video editing program.





The Innovator Mark