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< But before that happens, is there any sideways force on it, or on the 
paint-tin? Symmetry says no. Does anyone disagree so far?>

Go find a Mixmaster. Not a hand mixer, but a mixer that is on a stand and 
comes with a bowl. Now fill the bowl with batter, turn on the mixer. As the 
shafts rotate...funny thing, the bowl begins to rotate as well. And always in 
the same ddirection.

Yes, there is "prop walk" even in that situation. In that case the batter 
'expelled' between the whisks is analagous to the flow off the sides/ends of 
a single screw.

This conversation is akin to speculating on why an apple falls from a tree. 
Gravity--and prop walk--have both been extensively documented. Sorry, all, 
but speculating that they do not exist is an exercise in the absurd.

All you will prove is that none of us have the engineering background to 
explain what is already documented.

I submit that boats do not float because they are bouyant, they only float 
when Poseidon grants them favor. Prove me wrong.

   

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