As I consider you the expert on alternative internal combustion engines,
I would like to ask your opinion about the Duke sinusoidal ICE, which like
Liquid Piston has been in development for 20+ years with no working models

http://www.dukeengines.com

I wonder how that complex counter rotating crankshaft wears

And do the rotating cylinders maintain their seals?


Barry Gloger

Some of these concepts hang around for years while going no where.
In some case they are scams looking for money in the form of donations
or worthless stock sales.

In most cases nobody gets to independently run them or records their HP, life,
weight, durability or fuel burn.

In the case of the Duke it is in the category of a barrel engine. These we
tried back in 1913 or before.


I can highly recommend a book by Herschel Smith called "A History of
Aircraft Piston Engines" published by Sunflower University Press Inc. 1531
Yuma, Manhattan, Kansas 66502-4228. ISBN 0-07-058472-9. 629.134'352 in a
good library. This is a reprint of a book originally published by McGraw
Hill in 1981. Fourth printing 1993. There are 250, 8.5 by 11 pages. It
chronicles the evolution of the aircraft engine from early days to the
present. There are many tables listing every engine ever put in an airplane
with all important specifications including weight, horsepower, RPM,
configuration and in some cases BSFC. There are many photos and drawings of
all types of aircraft engines. This is as close to a bible of aircraft
engine history that I have found so far.

Paul Lamar


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