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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Intake velocity stack lengths
Date: Tue, 14 Jul 2009 22:57:17 -0400
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Hi Ben,

One thing I have learned it that you can not treat your engine as a
component of subsystems and expect to get the most out of it.  Be prepared
to do a lot of research and study if you really want to understand how all
the parts make the power production you want.

In other words, your power producing system will be no better than its
poorest performing part.  So if you really want to travel down this road,
you will find (in my opinion) quite fascinating - sometimes parts are a bit
hard to comprehend (at least for me), but in the end you will have a much
better understanding of how each part of the system must perform for the
entire system to perform well.  Focusing on just one aspect will result in
disappointment (in my opinion).

To start you on that journey I suggest you brows these websites which are
just a few of the hundreds you can probably find on the internet.

http://www.grapeaperacing.com/tech/inductionsystems.pdf

http://home.earthlink.net/~redcat/pulse_ram/theory.html

http://www.spiralmax.com/userscorner/aftvt.pdf

http://www.eng.fsu.edu/~shih/eml4421/student%20presentation%20EML%204421/man
ifold%20tuning.pdf

http://vmaxoutlaw.com/tech/exhaust.htm

Since there is only a limited amount we can do to the engine (and keep it
reliable for aircraft use), most of the gain will come in what we do with
the induction and exhaust systems (again in my opinion).

Good luck.

Ed


Ed

Ed Anderson

Rv-6A N494BW Rotary Powered

Matthews, NC

eanderson@carolina.rr.com

http://www.andersonee.com

http://www.dmack.net/mazda/index.html

http://www.flyrotary.com/

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.rotaryaviation.com/Rotorhead%20Truth.htm


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ben Schneider
Sent: Tuesday, July 14, 2009 9:33 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Intake velocity stack lengths


Fellows,

  I have been thinking up this crazy idea of trying to make intake runner
tubes out of carbon fiber. My question is regarding length of the velocity
stack. Does the length make a difference? Could a velocity stack be more or
less the entire length of the tube? Meaning, if I have a 12" intake tube,
could the entire length of the tube be a gradual taper to the diameter of
the block opening? Would that mess with the speed the air is traveling in
the tube? Aerodynamics is not something I have a very good handle on, and am
hoping someone out there in Fly Rotary land can shed some light.

Toughts???

BTW,  Any reasons why carbon fiber should not be used for intake tubes? May
make the velocity tubes a mute point.

Thanks for any thoughts.

Ben Schneider

P.S. Any Fly Rotary fellows going to OSH??? Perhaps a lunch one day or
something.


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