In article ,
says...
Dave Doe wrote:
Q2. I have a prop and I drag it through grease - as I do so it turns
to "allow" it it's passage through the grease. Now if I was to hold
the shaft so the prop does *not* rotate - surely that would be harder
to pull through the grease now. ?

Sounds like a slick idea, but I think you'd have to deep fry an awful lot
of french fries before you'd have enough to perform the experiment over a
reasonable distance. That assumes you don't die from a coronary first, what
with having to dispose of all that greasy food first....

Well Jim, when yer prepared to give me a scientific evidence based
answer....

Hey ok, I admit that, the Reynolds numbers are quite different due to
the grease vs air (grease is almost 100% friction based drag, air is
largely pressure based drag). And perhaps therein lies the answer -
however I wanna see the maths.

Reading up on 'a's' link now...
http://www.goshen.edu/physics/PropellerDrag/thesis.htm

--
Duncan