12 a
Hi Paul,
since I found your homepage, I've been following your mailing list. As I am a PPL
student now, I've been tinkering about the perfect GA engine in my head for some
time. I love the idea of turbo compounding the wankel for aviation use, especially
for GA I think that the world needs something more efficient than what we
currently have.
The problem about adding the turbo compound is that it requires major modifications
to the engine plus a huge gearbox to get the turbo shaft speed down engine shaft
speed. Not easy to build a proof of concept demonstrator that way ...
So how about this:
Imagine a 2-rotor wankel, like e.g. the RX 8 engine but with peripheral port (ref
book "Rotary Engines" by Kenichi Yamamoto). Add a BIG turbo charger. Now the turbo
compounding could be done by using only one rotor as a fuel burning ICE. The second
rotor on the other hand acts as our compound turbine. We simply feed the hot exhaust
gasses directly back into the 2nd rotor's intake port to recover the exhaust gas
energy.
After the 2nd exhaust comes the turbo, and catalytic converter and a silencer.
Depending on EGT, it would also be possible to first route the hot exhaust through
the catalytic and the turbo to get some of the energy out first before running it
back into the 2nd rotor.
The big advantage of this setup: it can be done with more or less stock parts and
some bent pipes, no custom molding & casting required to do a first proof of
concept.
What do you think? Doable? Because the only alternative is going full electric but
that's still taking some time until battery tech is getting good enough for decent
range. And that's from me being an electrical engineer, who is heavily biased
towards
all-electric propulsion ...
Best regards from Germany
Valentin Felsne
In my opinion global warming is a hoax and a religion. Emission from propeller
driven
aircraft will
never have a measurable effect on the atmosphere. It all sounds like a waste of time
and money.
The benefits of turbo compound are a better power to weight ratio and an
increase range
and payload. Also shorter take offs due to a much better power to weight ratio.
You should focus on that.
Paul Lamar
I agree global warming is political and just another means of increasing costs
and spending to create a false economy, there has always been climate changes
throughout history without human input. Also you could ground every propeller driven
aircraft and it would be impossible to see a measurable effect.
Thanks, Jacob Sturges
Quote:
In a rather testy exchange during a House hearing, Rep. Dana Rohrabacher tore
into Environmental Protection Agency Administrator Gina McCarthy for not knowing what
percentage of the atmosphere was made up of carbon dioxide.
What percentage of the atmosphere is CO2?” the California Republican asked
during a Thursday hearing.
I don’t have that calculation for you, sir,” McCarthy replied. “I don’t make
those guesses, sir.
You’re head of the EPA and you did not know,” Rohrabacher shot back in
astonishment, “and now you are basing policies that impact dramatically on the
American people and you didn’t know what the content of CO2 in the atmosphere was…
the justification for the very policies you’re talking about.
If you’re asking me how much CO2 is in the atmosphere, not a percentage but how
much, we have just reached levels of 400 parts per million, McCarthy said, looking
slightly annoyed with the lawmaker’s response.
Rohrabacher said carbon dioxide only makes up “one-half of one-tenth of one
percent of the atmosphere, adding that mankind only contributed to about 10 percent
of the total amount of CO2.
The Earth’s atmosphere is 78 percent nitrogen, 21 percent oxygen and 1 percent
other gases, including about 0.04 percent carbon dioxide. And yes, Earth’s CO2
concentration stood at 400 parts per million in May 2015.
End Quote.
They measured it in Hawaii back in May 2015 and not again since then. Not only
that there is an active
volcano in Hawaii. :-) The EPA is really stupid.
Paul Lamar
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