Here. Hold my beer.

Great idea, Roddie! Not between the cases, but between the Goldberg mount and the rear case. That should work. Let me think on it for a while. Maybe a thin sheet of cork or rubber to rub against the cylinder. I should have some cork sheet stashed away somewhere for either clarinet repair, or Mosin bedding.

The Craftsman Mark

Continued:

With the back case in place I screwed in the needle valve to see where the fuel nipple is.  I then marked the position and drilled a hole in the bottom of the rear case.  





Then I put the two cases back together.  







For reference, I measured the weight of this engine against an 8cc tanked Bee.  This engine is only 0.45 ounces more than the tanked engine.  2.35 ounces vs. 1.9 ounces for the Bee (68 vs. 54 grams).  







For the faux plug I dug around the old engines box looking for a bad glow head and found an engine with a glow head missing the filament.




Everyone wanted to know how I was using the cylinder to needle the engine.  The obvious method I was going to use was with a piece of fuel tubing to rotate the needle valve.  I didn’t want to ruin the existing needle on the reed valve assembly. So I dug around and found a spare fine needle.  I cut the top off of this and then slipped a short length of small fuel tubing over the stub.  As I said, I didn’t like my first idea.  So I just did a quicky change to try out my new idea.  All I did was cut a shim from a cookie tin for the fuel tubing to go through.  The fuel tubing sticks out of the top and when I put the faux plug on, it compresses the fuel tubing and traps it.  Thus, when I rotate the cylinder, it rotates the shim and the small fuel tubing attached to the needle.  I started off by opening the needle valve three turns, then installed the cylinder in the case backed out ¾ turn from all the way in.  Then I tightened the faux head down.  Unfortunately, I had a little too much fuel tubing sticking above the shim, so the head didn’t tighten down as I’d hoped on the test I did the other day.




Now that I know the idea works, I pulled the tin shim and made a new insert from brass shim stock.  I took a glow head gasket and put a tape backing on it.  I trimmed the tape around the outside of the gasket and taped it to the shim.  Next I used a Sharpie to mark the outline.  After that I drilled out the center for the fuel tubing and then trimmed the insert to the same size as a glow head gasket.  I put the insert in place and pulled the tubing through the hole.  Installing the faux head seemed to do much better with this brass shim and it tightened down much better than the tin shim did.







Lastly, I went ahead and dug out a cylinder heat shield and installed it between the rear case and the Goldberg mount.  I have to admit that Roddie’s idea to use the heat shield to provide friction resistance to the cylinder was be…  ***ahem***  Was bet…  ***cough***  Was bett…  ****wheeze***  Was bette… ***hack, cough***  Was equally as good as my idea, and I went with his instead.




The Congested Mark

Way to improvise Mark and another Good helping idea from roddie !! Have you ran it since the upgrade ? The weight came in good .

Okay.  I finally got around to building a plane for this.  No name for the plane yet.  But I also wanted to try making a flapped sheet wing plane, so this is two first flights in one.  The balloon tank is a 9” party balloon.  It’s filled up about half full.  That got a 9 minute and 45 second run.  On the way home I stopped at WalMart and got a bag of 7” balloons, and that’s only because they didn’t have 5” party balloons…  Ah, well.  They’re only 99 cents for the bag of 30 balloons.  I can always use the 9” balloons for the Medallion .15 on my SIG Acromaster.







The Double Mint Mark