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I don't know, Bob. I was prepared to believe you
using the reliable Hoover turbocharger vacuum system - but, now that you tell me
it was a Kirby, well...... {:>)
IF only increasing the air flow volume or velocity would
push significantly more air into the same displacement area all of these claims
would be more believable. But, the only way I am aware to mechanically
increase the amount of air in the same volume is to increase its density (which
results in higher pressure of course) by in effect compressing it. When
you have a pump doing this it has to be fast and has to be able to resist the
back flow from the higher pressure area. Positive displacement pumps such
as the roots roller or the screw types can do this at slower speeds but
generally with less efficiency and require a bit more power. The
centrifugal pump generally has to spin faster and requires precision impeller
blades and diffusers.
You can make more power chemically as George suggested
using Nitrous Oxide and perhaps other drag racer type fuels containing oxiders,
but just sending a stream of higher velocity air into the intake at the rates
mentioned simply won't do it.
You might gain a small amount due to the kinetic
energy (Dynamic pressure) of the fast flowing air converting to a static
pressure increase, but not anything approach several inches. If all the
kinetic energy of a 350 mph wind stream were converted to static pressure you
would get around 2 psi of pressure increase. It would, of course, have to
also have to be of sufficient airflow volume (CFM) to stuff a manifold worth of
air to a 2 psi increase - all the time the engine is sucking down the pressure
in the manifold.
I won't say it can not be done, but I don't see
how
Ed
----- Original Message -----
Sent: Friday, December 21, 2007 10:30
AM
Subject: [FlyRotary] Re: superchargers
electric
OOPs...it was a Kirby vacuum
cleaner.
bm
-----Original Message-----
From: bmears9413@aol.com
To: Rotary motors
in aircraft <flyrotary@lancaironline.net>
Sent:
Fri, 21 Dec 2007 8:29 am
Subject: [FlyRotary] Re: superchargers
electric
ED,
I built and electric supercharger back in 1980 that would produce about 3
lbs. of boost. It was built from a Hoover vacuum cleaner. Even then the high
output motor was over a hundred bucks. I wired it direct to the alternator
(back the they were external volt regs) and ran it off 110 volts. Still have
it. Would make a significant difference in the performance of a GLC!
Well, I have already confessed my skepticism - however,
its really hard to say. One thing in their favor, they appear to be
using a centrifugal pump with a scroll diffuser very similar to that on a
turbo charger. Meaning that if indeed they can spin it fast enough it
should work. Now one of the individuals on their forum indicated
they measured its spin at 25000 rpm. That's a bit slow for a
turbocharger but, it may indeed be enough to produce some boost.
We all know that motors and electric devices have made
some major improvements in the last decade or so, but still a 1 1/2 HP
electric motor just seems a bit on the large size physically and what really
bothers me is no specifications on their web site. Hard to assess and/or
refute data you don't have {:>).
But, what really bothers me is I just don't see how you
could even manufacture the scroll housing and compressor blades much less a 1
- 1 1/2HP electric motor and sell it for $99.00 - even if made in China.
I really want to believe - but, its sure is hard to find any data to help that
belief along {:>).
I guess IF I really thought it was credible, I would
have my $99.00 check in the mail and I don't.
Ed
----- Original Message -----
Sent: Thursday, December 20, 2007 1:22
PM
Subject: [FlyRotary] superchargers
electric
Ed, this thread is starting to look like the
electric water pump thread that can't work. I just have a feeling that
your inquisitive mind is going to go somewhere with this one.
JohnD
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