Got an email from Poul Woelfle on their new ultra lite
 rotary engine. PL


 "We have in the meantime finished our single-rotor aircraft engine, and
we
 are just speaking to the first customers. Since Rotax has apparently
 stopped
 production of the 447, it seems that its a good time to enter the
aviation
 market. Attached you find a data sheet of the engine.

 The main objective for now was to make it run well, and it does that. It
 starts with a 3Ah battery and has clean idle (slight torsional vibration
 with a propeller due to the belt drive). The throttle responsiveness is
 also
 good since we replaced the vacuum actuator for the direct intake (P-port)
 with a mechanical device that only opens on the last � of carburettor
 opening. Also (as suggested by a Paramotor customer in France) we made
the
 V-belt pulley auto-ventilated, and this has eliminated any heat issues we
 have had with some belt types. A customer in England has flown the engine
 in
 this final design and is really excited about it.

 Also fuel consumption is not the best
 in the world, but compared to 2-stroke data I could find, we seem to be
 doing quite well. I can also send you a CAD file of the engine if you
want
 to see the outside dimensions.

 We would be curious to hear your opinion and of course any criticism or
 suggestions for improvement.

 Best Regards  also from my father,

 Poul

 Poul Henrik Woelfle

 Woelfle Engineering GmbH

 Randstra�e 109

 D - 47804 Krefeld
 Tel. +49 2151 151020
 Fax +49 2151 151019
 www.woelfle-engineering.com
 HRB 7369, Amtsgericht Krefeld
 Gesch�ftsf�hrer: Paul A. Woelfle


 Thanks Poul,

 Sounds great and please send the CAD dwg.
 The fuel consumption is not an issue for ultralights
 in this country and Canada as they are only used maybe once a
 month for a couple of hours of low and slow recreational flying.
 It is about 20% lower than a 2 cycle however.

 All rotaries have a certain amount of torsional vibration.
 Your upcoming two rotor will be even smoother.

 I suggest you use the ceramic bearings and up the  take off
 RPM and HP for five minutes. Typical of all aircraft engines. I think
 customers will be more impressed with higher HP and you will sell
 more engines.

 When I get this multi-strike CD ignition system finished I'll ship
 you one and you can test it on the dyno to see if it improves
 the BSFC.

 Paul Lamar



Paul,

Thank you for your efforts to keep this email group on the cutting edge.

Exciting stuff to read about this XF40. AVL is also working on a range
extender utilizing this core unless I am mistaken. I have seen pictures
that
may hint to Direct Injection (whether it is a mock up or actual production
intent I can't say.) version on the range extender. The point being should
a
project like that come to fruition, quantities of scale can't hurt the
potential of the project making it long term (other than karting) and the
potential of DI even making on "the wing". Never mind solar panels,  a
Co-Gen
unit of the XF40 (or 2 rotor) such at this running of natural gas using
the
engine heat as a pre-heater or total heater for your Hot H2O is probably
more due-able than Van Jones and the Emerald City Project and pie in the
sky
photo voltaics that still haven't had the magical breakthrough  in the 170
yrs they have been around (unless I am mistaken). The electricity from the
Co-gen for household use and or to a Heat Pump could take care of a
majority
of your HVAC needs depending upon the climate. Interesting stuff indeed...

My best,
Anthony

Do you have any AVL tech papers published on range extender project?

One thing to always keep in mind about modern cars.
The high excess HP is there when needed to accelerate during high cruise
speeds and to climb hills. Electric cars with range extenders
do not provide that need. There is barely enough excess power to
sustain cruise speeds once the batteries need recharging.
Therefore electric cars  will never sell unless
they are forced on the population at the point of a gun like
the Traubant was.

Green has become an euphemism for a dictatorial government.
That should raise a red flag (pardon the pun) every time
one hears that kind of BS :)

Paul Lamar

Paul,

Found a couple of PDF's they may not be technical papers you are looking for
however.

http://www.autoinfo.gov.cn/fdj1zw/fdj/2009/Hubert_cqyz12.pdf

http://www.rolandberger.at/media/pdf/Roland_Berger_SumSy09_List_20090622.pdf

Yes I never understood the extra power requirement while climbing hills and
or accelerating for EV's. Until I spoke with one of my auto gnomes on a
"high profile" project that will rename nameless :-). It came to light when
I asked why the engine was not running constant for the lowest BSFC and why
they were not using the battery as the main power source and they answer I
got was somewhat along your lines. They couldn't make the battery big enough
and from my research we don't have an ultra-capacitor or other device to
fill in for those worse case senarios. On the Greenies they are watermelons,
Green on the outside and red on the inside....

Anthony

I like the water melon analogy :)
It is all based on a phony requirement to reduce man made CO2.
The jury is still out on the optimum level of CO2 as higher
CO2 levels makes plants grow faster. Levels are far from toxic
to humans and linear extrapolations are invalid due to negative
feedback. Ancient history has shown CO2 going up and down over
the long term with no dire consequence. Unless of course somebody
comes up with a theory on CO2 causing the demise of the poor
dinosaurs :)

Paul Lamar