REFLECTOR: Exhaust systems

[Dale W. Thomas]

It seems it could probably be done.  Just design, build and install an
exhaust consisting of three parts.  Each will serve two cylinders and exit
the cowling at different places that will allow the exhaust to pulse
between the blades.  Seems to work on paper, but like many other things,
it may be a daunting task to make it work in real life.  But, then again,
most new things are like that.  It comes down to how bad you want it and
is it really worth the effort.

Dale



> So, can the three bladed prop be mounted on an IO-540 to avoid burning?
> (Sorry if I seem dense)  If so, how?
>
>
>
> -----Original Message-----
> From: Simon Aegerter [mailto:simon@aegerter.net]
> Sent: Friday, July 11, 2003 8:17 AM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR: Exhaust systems
>
>>After all, 3 does divide evenly into 6.
>
> You are absolutely right, Dale.
>
> A 6-cylinder engine fires 6 times during 2 full turns, that is 720
> degrees. 720/6 = 120. That means, the blasts are seperated by 120  deg.
> That happens to be the spacing of the blades of a 3-blade prop.  So.
> with a 6 cyl. engine and a three bladed prop you can have the  blast in
> one of two places: onto the blades or between them,
> depending on how you mount the prop. Presto!
>
> I have not flown a whole lot of hours since I turned my exhausts
> (3-in-1) backwards but I see no charring, just some soot.
>
> Somebody asked about a 4-bladed prop. Same argument, different
> result: a 4-cyl fires 4 times in two turns - so 180 deg apart. unless
> you have 8 ways to mount your prop, you are making sure that at least
> two blades are hit every two turns.
>
> Best
> Simon
> --
> Simon Aegerter, Wollerau, Switzerland
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