Paul,
I was reading on the EPS Graflight 8 engine and noted the CGI
(Compacted
Graphite Iron) process to produce their weight reduction for the
Aviation
350+ HP Diesel Engine they are developing.
Upon reading some articles listed below, it appears that Wankel
Engine
Rotors and Housings could be made with this material, for improved
Heat
control and Weight reduction in the Wankel 3 or 4 Rotor Engines. As
I read
it the machining of parts in addition to design deliver weight
reduction to
the engine.
The heat aspect of using CGI factors in using iron vs aluminum,
going back
and engineering the components of the Wankel with CGI material may
deliver
the solution to heat and weight to both the Rotor's and Housings. In
the
news letter I read that rotor weight reduction opens greater
horsepower
production opportunities.
CGI A New Material for Highly Stressed Cylinder Blocks and Cylinder
Heads
<http://www.sintercast.com/file/documents/pdf/library-2/technical-publicatio
ns-1/cgi-a-new-material-for-highly-stressed-cylinder-blocks-and-cylinder-hea
ds-1.pdf>
Why Compacted Graphite Iron - Cutting Developments Make Application
Now
Practical
<https://www.competitiveproduction.com/articles/why-compacted-graphite-iron/
>
CGI breakthrough - An advanced third-generation compact graphite
iron
process, called Graphyte Flow, is transforming engine production
<http://www.enginetechnologyinternational.com/cgi_breakthrough.php>
Guesser-Compacted Graphite Iron for Diesel Engine
<http://www.tupy.com.br/downloads/guesser/compacted_graphite_iron_for_diesel
.pdf>
Thanks,
George F. Curtis Jr.
The problem is single stage PSRU planets appear to be limited to
3:1. So we
are at the practical limit of RPM.
Paul Lamar
Paul,
There are other materials, ADI (Austempered Ductile Iron) for one.
80% the
weight of steel, much cheaper, etc.
Maybe worth a look?
http://www.appliedprocess.com/adi
http://www.afsinc.org/files/10-129.pdf
<http://www.afsinc.org/files/10-129.pdf>
We are looking at it to produce crankshafts and rods for a small
radial
Russ Ward
My R&D plate is broken :-)
I'll stick with what is known to work. Stock Mazda rotor.
Paul Lamar
Truly useful technology.
Imagine the man hours and cost to get to the point that the rotary
engine
has been at for some time.
It is not at all surprising that the rotary engine has not received
the
attention it deserves.
Can you see the manufactures of the piston engine wanting the wide
spread
use of an engine that is almost indestructible with low
manufacturing costs
and few spares required.
Have a read through of all of the web sites posted about CGI and you
will
realise the amount of money spent on sustaining technology that is
60 years
out of date.
Turbo compound is not new, however it has been ignored for many
years. Even
if turbo compound was adopted for all internal combustion engines,
we would
still be a long way short of the electric motor.
At present I am having to run with the Rotary engine, given the
choice I
would use electric but at this stage battery storage needs a 4fold
leap in
storage density. This won't happen while the research dollars are
spent by
the automotive industry trying to preserve their Dinosaur.
Over 35 years ago I was using Ni Cad cells in CD ignition units with
a
recharge time of 15mins. The advancement in battery technology or
should I
say non advancement is staggering.
I have never been an enthusiast of the internal combustion engine
but at
this stage it is the best we have for aircraft.
Andrew Campbell.
Batteries are limited by the periodic table. If one knows what that
is one
can see why the possibilities are severely limited.
The aluminum end housings are working fine so I will stick with
that. At only 6000 or 7000 RPM the current rotors are working
fine. No need for new tech there. Now their may be a slight
improvement in BSFC making rotors out of a material that has
a lower coefficient of heat transfer.
Here is a little trick. If you have a belt sander and a hand held
low cost
infra red thermometer.
Wear a pair of welding gloves and hold a 4 inch long strip of
aluminum
on the belt and record the temperature on the other end.
Do that with compacted iron, steel and SS as well with the same size
and tell me what you find out.
Paul Lamar.
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