Hello. Have you ever seen this company?
http://www.wankelsupertec.de/en_index.html

They make some light weight engines. Maybe the 2 rotor 350 engine is
a good choice  for aircraft application.

Regards Kenneth Martinsen

Yes I spoke with  them at Aero. However I have never seen one run.

Paul Lamar


Those are some very good looking engines!

Dan Gorsline

IMHO There is a major flaw. The rotor bearing needs to be much wider
for this reason. See the attached JPG. This was discovered over a 100
years ago. It amazes me engine designer still make this mistake.

This limits the RPM and manifold pressure both of which create HP.

It is from Taylors books on engine design. This is the bible of
engine design and every engine designer should read it.

http://www.rotaryeng.net/books10.html

The Internal Combustion Engine in Theory and Practice.

Volume 1: Thermodynamics, Fluid Flow, Performance. Second Edition
Revised.

Volume 2: Combustion, Fuels, Materials, Design. Revised. Charles
Fayette Taylor. The MIT Press Cambridge Massachusetts, and London
England.

BTW Dan, please add your last name to your messages.  Out of the 900
people on here we have many Dan's.

Paul Lamar



Hi Paul, Yes, those plain bearings certainly appear to be too narrow.
Higher oil pressure may overcome lack of load bearing capacity
somewhat (possibly). I did not notice any O rings, are they in the
side plates ? does this engine rotate in the opposite direction ?
Chris Hoskins.

Most of that is just mock ups. It has been around for at least five
years and I have never heard of one running.

Paul Lamar




Hello

I worked for three years at WST as product manager, the engines runs
really! But it is hard to buy one, they love their work to much ;-)
Most of the handmade samples are dumped by
"secret-skunk-works-customers"....

One test-series is now out for trials as APU-preheater-generaterset
for diesel-railway-engines.
http://www.lr-online.de/storage/scl/xmliosimport/wir/3380184_m1t1w500q75v47964_201504281435-GHA5GIK42.1-ORG.jpg?version=1430961254



http://www.lr-online.de/nachrichten/wirtschaft/Cottbuser-Wankel-auf-Dieselloks;art1067,5016240



It is the small block-wankel, turbo carged and as diesel.
Hopefully this lil-jewel breaks out the lab and will be manufactured
in big numbers. Would be the long eagerly awaited kerosene two
rotor-LSA engine.

Claude  Jaegg


Unless some one with no axe to grind can buy one and test it the
claims will remain just claims.

I have my doubts.

Also I am not waiting for a carcinogenic diesel engine to fly behind
:-)

Paul Lamar


Paul, as you know some super-secret-customer invest only in diesel,
all their other stuff runs with.

the WST works very well on a wide choice of fuel, liquid and gaseous.
it is also possible to hot-switch on a running engine from diesel to
gasoline and then on LPG, H2 or alcohol. burns also good vodka!

The smell behind your plane depend on your wallet ;-)

Claude Jaegg

Diesel exhaust scrubbers cost $15,000 in the states unless your VW
and then you lie about it :-).

If that is the case it is not running as a true Diesel. Gasoline
won't work with a 20:1 diesel compression ratio. Wankel AG and
Mistral built some engines with diesel fuel injection. The
compression ratio was less that 10:1

The fuel burn was no better than on gasoline.

Paul Lamar

Diesel is heavier as gasoline, but the kg-fuel burn rate depend only on specific energy in fuel. The WST-wankel are designed for high turbo blast. They run at aircraft-power settings with stratified charge and homogeneous ignition without sparks, beating all other designs.

On paper the electric assisted turbocharger is the best option, for an A/C customer I realised a 80kW-compound with 25kg mass.
It would be no problem to do 160kW with 40kg.

To feed this turbo a four rotor is mandatory, will weight around 100kg [220 pounds].

Not bad for an 500kW [670 HP] plant with BFSC under 200gr/kWh with diesel or LPG ;-)

Claude Jaegg

We will see when an independent organizations tests it and publishes the results.

Paul Lamar

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