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Post  batjac Sun Nov 06, 2022 11:58 am

Ken,

I've seen that 1/2A Challenger also. It's intrigued me since it doesn't look like the plans that I have. Do the plans also list Dick Sarpolus as the designer? The plans I have look a little more like the .35 size and the .15 size planes. Just subtle differences. I was wondering if Dick redrew the 1/2A for Bill Noyes a little different to be unique to his kitting.

The Just A Touch Off Mark
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Post  Ken Cook Sun Nov 06, 2022 5:05 pm

Mark, the Garden State Circle Burners used to have their annual swap meet the week prior to Thanksgiving. It all ended a year ago. I used to see Dick on occasion. A few years back he was selling some of his larger models which sold for practically nothing. For the record, he's one of the nicest people to talk with. I could've gotten the answer directly from him. I didn't see anything on the print. I do believe your theory is probably very accurate though as this happened quite a bit.
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Post  batjac Thu Nov 17, 2022 8:16 pm

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.  


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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.





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