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 51 
 on: Today at 01:16:05 PM 
Started by Robert Storick - Last post by Brett Buck
I agree with Mr Ryan. It would have to be the original formula.

 Careful what you wish for. I think that most of us were familiar and grew up with the acrylic lacquer version of Aerogloss. However, there was a previous type marketed under the Aerogloss name that was a traditional butyrate dope - which we currently have in multiple choices.

    Brett

 52 
 on: Today at 01:01:13 PM 
Started by Bill Burton - Last post by Jason Greer
Pat King also has a laser cut kit of the Yak 9. 
http://stunthanger.com/smf/index.php?topic=33476.0

 53 
 on: Today at 12:52:43 PM 
Started by Bill Burton - Last post by Robert Storick
Mike Griffen did that but  I believe you will have to access SSW to contact him. No can do on here.

Which would be a RSM kit

 54 
 on: Today at 12:44:36 PM 
Started by Chancey Chorney - Last post by Mark Mc
SNOOPY'S DOG HOUSE BY R.L. CRUSAN, is available from the AMA plans service for $13. Bob specialized in unusual designs, all of which flew amazing well. I think I will build one for the final Brodak Flyin, Bob would have liked that.



John, could you please give me the month/year and the plans number?  As usual, the Model Aviation website won't let me in to see the archives, and the plans page is garbage for trying to search for a plan.

Mark

 55 
 on: Today at 12:18:57 PM 
Started by Motorman - Last post by Motorman
Oh I see, you're talking about the small front valve case. Mine are the heavier front case with the collet drive. I'll be ok while crashing.

Did another search and apparently a Stan Powell would do some kind of mod to the transfer ports but couldn't find the numbers. What's a good blow down timing for stunt, should I copy the 4050 timing?

MM

 56 
 on: Today at 10:58:15 AM 
Started by frank mccune - Last post by Brett Buck
I'm not an engine guy, but here are a couple thoughts to mull over. It's possible that you may want turbulent flow to mix the charge better as it enters the case and then ports. In 100cc kart engines, we found that polished transfer roofs worked noticably less well than rough ones in getting the charge into the combustion chamber (maybe it just allowed it to burn better or cut exhaust losses). Also, turbulators on wings allow flow to conform better, really changing HLG flight characteristics. So, might it be possible that the sharp transitions mix the charge better? 'just wondering...

  For stunt, it's actually critically important, far more important than the volumetric efficiency or flow per unit draw. Not changing flow characteristics with changes to the load or the input air direction/velocity. This is what leads to the unexpected phase changes/apparent mixture changes. Since you don't really care how efficient it is and you can get arbitrary amounts of power almost no matter what you do to the venturi, my opinion and experience has been that almost anything you can do to improve mixing or make it insensitive to maneuvering, the better. That's why you want diffusers on the input, and, if there was a way to do it, you might want a large plenum as an airbox. 

   One of the reasons the ST46 runs so smoothly is that the internal shape of the venturi is *not* smooth, making the otherwise very undesirable "flush fuel inlet" work OK. In the stock venturi, the fuel comes in through 6 holes that reside in the lee of a sharp edge, where the flow is almost certainly very turbulent and relatively low velocity.

   Note that the fuel suction is only one side of the equation - it also matters how hard it is to suck the fuel through the plumbing. Completely conventional plumbing has to flow at most about 1.5 ounce/minute on average (8 ounces for a pattern), that doesn't mean it flows freely enough to keep it from unexpectedly going lean, because the required peak flow is much higher than the average. This is the problem with 4-strokes running conventional tanks and thick fuel, but it also happens on the larger 2-strokes.

   There, that ought to get the spirited discussion started again.


   Brett



 57 
 on: Today at 10:57:32 AM 
Started by badbill - Last post by badbill
Just scored a couple of beautiful G21's and would like some delrin venturis, large and small orfice. Have you got any?

 58 
 on: Today at 10:38:02 AM 
Started by robert harness - Last post by proparc
Looks like I am about to attend my first Team Trials, (as a spectator). Hopefully, I can borrow a longer lens from Tom for the event. Will also try to do some video.

 59 
 on: Today at 10:19:49 AM 
Started by badbill - Last post by John Craig
http://stunthanger.com/smf/index.php?board=32.0

Call Jim Lee

 60 
 on: Today at 10:09:07 AM 
Started by Bob Reeves - Last post by Jim Kraft
Standing here with a moment of silence with my hat on my heart. But, it is easy to see what happened Joe. The plane rejected being flown by electric. It just spewed that prop and spinner right off in disgust. Sorry Joe, just had to do it.  Devil

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