Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Tuned Pipes

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Old 03-16-2008, 12:12 PM
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ILove2Bld
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Default Tuned Pipes

Any good documents on tuned pipes. I have a Webra Speed 60 ABC dual ball bearing schnurel ported. I have a tuned pipe and a header. This is going in an Ultra Sport 60. What I know so far is that as one adjusts the overall length RPM or torque increase but not at the same time. I would just like some more concrete information and tuning instructions about this. Any help would be greatly appreciated. Does th oil content change as I no this is going to really work the engine harder and then what about the nitro?
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Old 03-16-2008, 12:32 PM
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Default RE: Tuned Pipes

Sorry Its a 61 side exhaust and a MAC tuned pipe and header.
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Old 03-16-2008, 12:51 PM
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Default RE: Tuned Pipes

Three great sources of info:

http://www.macspro.com/tuning.asp
http://www.macspro.com/pressure.asp
http://www.jettengineering.com/ good engine break-in info. works well on Webras too.
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Old 03-16-2008, 12:56 PM
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Default RE: Tuned Pipes

Also The Bolly Book:

http://www.bolly.com.au/book/content.html


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Old 03-16-2008, 01:17 PM
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Default RE: Tuned Pipes

Cut the header to 4.25" as shown in the sketch on the Macs site, this should be good place to start for run-in. After run-in, tune the pipe with the intended flight prop, say an APC 11X7 or so. 10% nitro is the max I run here with 100* days. If it's cold and it's already run-in, you may get away with 15%. During run-in, a couple of table spoons of caster oil per 8oz. tank wont hurt either.
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Old 03-17-2008, 04:33 AM
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Default RE: Tuned Pipes

also have a look at http://www.prestwich.ndirect.co.uk/tunedpipetheory2.htm greg
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Old 03-19-2008, 06:39 PM
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Default RE: Tuned Pipes

Thanks so much guys more than I expected! I will try to check these out so when the time comes ill be ready. I cant wait for this project to begin but have 3 other models in front of it but I like to be prepared ahead of time. Finishing my Pica Touche, Super Sportster 60 and a Tracer 40.Owe and a RV-4 Park flier. All KITS!
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