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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
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