Message-ID: <05d701c378d7$128f7880$292dbbd0@7n7z201>
From: "William" <wschertz@ispwest.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2575899@logan.com>
Subject: Re: [FlyRotary] Re: turbo wastegate requirements
Date: Thu, 11 Sep 2003 21:39:19 -0500
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With respect to the need for intercoolers, bear in mind that it is the
adiabatic heat of compression that heats the air, so the more boost, the
more heat. whether you use the boost first,last, or in the middle doesn't
seem to matter in my mind, the heat of compression will be the same.
Bill Schertz
----- Original Message -----
From: "Jim Sower" <canarder@frontiernet.net>


> Yeah.  I've been off the list for about 9 months and missed your posts.
Before I
> left, I wasn't that interested in turbocharging.  While I was "on
sabbatical" the
> notion developed that a turbocharger is the most effective muffler
available for
> a rotary - with the collateral benefit of boost :o)  I would simplify (the
> mechanical aspects) by using independent levers for throttle and
wastegate, but
> aside from that I am right there with you.  Rusty tells us that there
is -some-
> boost is there even with the wastegate wide open but that is manageable.
The
> arrangement of using boost last - after WOT is reached - will minimize
> intercooling requirements.  I like your pop-off valve that goes at an
absolute
> MAP and not some over pressure.
> We seem to be on the same page .... Jim S.
>
>
> Marvin Kaye wrote:
>
> > Jim Sower <canarder@frontiernet.net> wrote:
> >
> > >>>I would have a manual internal waste gate.  The waste gate would
> > be normally open (dumping all exhaust past the turbo).  On
> > takeoff, I would run WOT (say 29"), no boost.  I could close the
> > waste gate a little and get 33" for example for a hot day or
> > short field.  As I climb out at WOT, I gradually close the waste
> > gate to maintain 30" MAP. ...<snip>...<<<
> >
> > I have outlined essentially this same system here several times during
the
> > last few years, as it is the simplest and probably the least complicated
way
> > (read less plumbing and parts) to get the job done.  My intention is to
setup
> > the throttle lever so 50% travel gives me WOT at the throttle body.  As
I
> > further advance the throttle lever the wastegate begins to close and
brings
> > the turbo online.  With the throttle lever wide open the wastegate will
be
> > fully closed.  The popoff on the intake manifold is referenced to MAP
and not
> > boost, and set to blow off at my intended 34" MAP redline... this way
the
> > overboost protection is unaffected by ambient pressure.  Just thought
I'd
> > share this once again as it's a hot topic revisited.
> >
> >         <marv>
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
> --
> Jim Sower
> Crossville, TN; Chapter 5
> Long-EZ N83RT, Velocity N4095T
>
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html