Miscellaneous Papers
Elastic instability model of rapid beak closure in hummingbirds
Smith ML, Yanega GM, Ruina A.
J Theor Biol. 2011 May 18. [pdf]
The "Push-Me Pull-You" Boat is Better Still
(PDF)
Ruina, A., 1978 (in revision for American Journal of Physics).
My first paper, on sailing upwind and sailing downwind faster than the
wind, is in its nth year of revision (subtract 1978 from current date
to calculate n).
For related you-tube videos, search for DDWFTTW, DWFTTW, Direct down
wind faster than the wind, or down wind faster than the wind.
Unpublished semi-ideas from my friend Jim Papadopoulos and myself.
Email
Jim,
Andy
Euler's Disk,
Jellett's egg,
and Moffatt's Nature,
Comments about things that go in circles on the ground.
A partial list of gripes.
Talk on brief introduction to mechanics (PDF)
Rant about "internal" and "external" work in biomechanics (PDF)
Review of Mark Levi's book, Why Cat's Land on Their Feet
and And 76 Other Physical Paradoxes and Puzzles for the American Journal
of Physics, August
2012 (PDF).
Krugman's who's-zooming-who traffic paradox, July 2013 (PDF).
Bump-Stock Gun Dynamics, Febuary 2018 (PDF).
An essay about how to write a report.
