Re: Video WasRe: [DMCForum] Stuck in the doldrums....

["Andrei Cular" <acular@xxxxxxxxxxxxxxx>]

I would not even think about trying to build my own turbines....  I have
friends that work in that industry they happen to work at 3 of the top
companies  GE, Pratt, and Siemens/westing house.  I have seen the work
that
has to go into the parts, one guy spent 2 years working on a vain for the
second turbine after the combustor.  Now this is at a company who has
experts doing the design and big $$$$ to make many prototypes.

A turbine powered vehicle is just something my cousin and I have been
wanting to try for a long time.  It started with looking at building one
from an old turbo and trying to mount it to a motorcycle frame.

Your Freon system sounds really interesting.  Have you done any formula
calculations or started a design?  I would really like to see some if you
have.


Andrei




----- Original Message -----
From: "Stragand, Dave" <dave.stragand@xxxxxxxxxxx>
To: <DMCForum@xxxxxxxxxxxxxxx>
Sent: Thursday, August 15, 2002 4:30 PM
Subject: RE: Video WasRe: [DMCForum] Stuck in the doldrums....


> Chrysler had several turbine projects dating back all the way to 1954.
The biggest problem was exhaust heat.  They 1200+ degree temps had a
tendency to actually set asphalt on fire (although regenrators helped cut
the heat down to half that, paper near the exhaust -would- burst into
flame).  You have to run combustion turbines at high speeds (2,000 -
25,000+
RPM compared to lower-speed steam/air turbines) to get any kind of torque
or
effeiciency from them, and at such speeds vibrations are a real problem.
(http://www.turbinecar.com/turbine.htm ,
http://www.allpar.com/mopar/turbine.html)
>
> Andrei -- as an FYI -- it will be damn near impossible for you to
fabricate the components you'll need for the turbine that can handle the
stress and the speeds, as well as maintaining precision weighting of each
individual blade to avoid vibration that will blow it apart.  Bear in mind
also that you'll have to plan for centripital lengthening and deformation
of
the blades at those speeds, as well as with the heat and combustion
pressures.  You're also going to need to work with expensive, exotic
alloys
to have success at these speeds.  If anything, you're probably going to
have
to find a way to adapter impeller blades from a very small jet, which are
expensive, hard to find, and also only about 1/8 of the length you'd need
for a combustion turbine.  There's a reason you don't see combustion
turbines used very often.  I don't know of a single consumer or industrial
use for these engines.  Nonetheless, if you do end up giving it a shot,
I'd
love to hear more about what worked!
>  and didn't work for ya'!
>
> A better, more workable solution was developed by a man named Lear, of
Lear Jet fame.  His Lear Vapordyne was a steam turbine using captive Freon
for steam.  He entered the Vapordyne in the Indy 500 in 1969, but was
banned
because they could never figure out how to classify his "displacement".
The
real reason was, he could finish the entire race on one tank of fuel --
and
that fuel could be anything from vegetable oil to diesel to alcohol.
(http://lear-archives.com/learmotors.htm ,
http://www.exford.co.uk/Steam/Latest.htm)



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