I usually do my due diligence and search first and there are a lot of hints that I found
BUT I would still like to ask a question or two
To date I have just lived with recommended factory mufflers, never bought any lite tube types
Recently I did get some engines with Tongue mufflers.
Most are NOT tapped and fitted for pressure fitting..
Each has pre drilled exhaust holes.... but the number and size--- is not to me--- consistent within a engine size, some have 5 or 6 bigger holes others 10~14 smaller holes
I am very lucky ---OR you guys have so much good free advice that each plane, prop, engine, tank, venturi, NVA mix that I have set up---each has worked just about perfect for me first time out... very minor fiddling with line length, prop and fuel mix
Of course I am a pure hack, and probably would not recognize a good stunt run if it bit my butt but so far...all my engines start, are set to a recommended RPM, launched, and fly out the tank with NO drama, burps, run away ....I used to fly combat so really can recognize a very lean 12 minute engine cooking run...in fact put a few in the dirt to save the engine
The Fox 35 (no burp plug) is my only one with a pronounced 4-2-4 that is pretty cool to experience... the BBTU OS, .20~.25 to LA/FP 40s and 46s just churn along going pretty good up hill and settling back stable down hill and level
I have one or more ARFs and other bigger planes planned that I might need to consider the Tongue mufflers just for weight and balance reasons
MY searching suggest where the pressure nipple is located--- is just a matter of anywhere that makes sense for the line routing....
True?
Or is there some optimal location?
What I am really uncertain of, is how to evaluate a particular engine to determine if IT needs more or larger holes, or some closed in
Current never used Tongue / chip mufflers
Evo .36
Lew Woolard Fox .35 and Fox .40
Stock LA .40 .46
RS B&B LA .46
Tom D modified OS FP 40
The Magnum .52 I got from Randy for a ARF SV 11 came with the porky factory Muff and I know he has lighter tube or tongues for it
Thoughts
Opinions
advice sought
Sport flyer hack with NO desire nor ability for overhead 8 and/or 15 G sharp square corners