Message-ID: <20030716162752.97123.qmail@web41109.mail.yahoo.com>
Date: Wed, 16 Jul 2003 09:27:52 -0700 (PDT)
From: Caleb Ramsby <ramsbergenheighmer@yahoo.com>
Subject: Re: [FlyRotary] Re: Engine Failure Report from Chuck Dunlap
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-2476267@logan.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

--- Ed Anderson <eanderson@carolina.rr.com> wrote:
> 
> 
> 
> >
> > So if one were using a supercharger instead of a
> > turbocharger that it would still be putting out
> the
> > same amount of an intake charge.
> >
> > I wonder how much would go through the unoperated
> > rotor and how much would go through the running
> rotor.
> > There could be a chance of a drastic overboost
> with a
> > rotor going on a supercharged engine.
> >
> > What do you guys think?
> >
> > Caleb Ramsby
> >
> 
> Interesting consideration, Caleb.
> 
>     Certainly, the lower exhaust mass flow would
> have no effect on a
> supercharger, however, as we know a supercharger
> draws all its energy
> requirement from the engine useful HP.  Therefore,
> the question as I see it
> is would the supercharger provide sufficiently more
> power with the remaining
> one rotor to 1.  Cover the supercharger HP needs and
> 2. Provide adequate
> boost to get more HP out of the one rotor.  Don't
> know, good question.
> 
> Ed Anderson

Ed,

Lets see what can be figured out.

Since the superchargers power needs are directly
dependant on it's volume of air moved and resistance
to said air moving(back pressure from rotors).

1. The superchargers output in volume is fixed with
it's speed of operation and too a lesser extent it's
back pressure.

2. The supercharger spins at a rate that is directly
proportional with the engines speed since it is
directly driven. Thus there is a fixed power
requirement needed to run the engine at a given rpm. 

3. With only one rotor running the supercharger would
still be moving about the same volume of air for a
given rpm.

4. Would the unoperable rotor create a lessened
backpressure at it's inlet port or would it be an
increase.

5. If it were a decrease then the air coming from the
supercharger would tend to want to go to the
unoperable rotor and decrease the air being forced
into the running rotor thus decreasing the power
availiable to turn the prop.

6. If it were an increase then there would be more of
a charge going to the operable rotor and thus more
power made from that rotor. However, this increase in
power could result in another rotor that does not run
and then you are flying dead stick!

What do you guys think?

Caleb Ramsby

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