Cyclone Power Technologies, Inc. (fka CYPW)

[Tom Swift]

I'm sure none of these are exactly the same engine, for one thing they are all steam (just to keep it relevant to Cyclone, sorta). But these are just a tiny selection of wobbler engines that basically embody many of the traits of the Duke engine. Similar gasoline "barrel engine" designs had a period of vogue in the 20's and 30's with an effort to reduce frontal resistance. That none of these was successful in the market might make one wonder.

1847 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US5185.pdf

1881 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US243112.pdf

1903 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US747926.pdf

1907 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US853095.pdf

1911 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US995384.pdf

1973 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US3771419.pdf

1974 http://www.popsci.com/archive-viewer?id=N93SwXbzXC4C&pg=63

1981 https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US4262579.pdf