the little belt drive on my cheap rockwell table saw has held up for years and
years under my abuse!
i don't have one on my trailer jack
m
Sorry, I am not buying it. B Why, you may ask? Well, he provides
absolutley no data, no methodology to test B or anything other than trust
me. Just because he says B it is so. B Well, he has to show me the math
and physics involved. B He talks of no torsional inputs from the prop,
but looking at his cowling arrangement shows me that's baloney. Every
time a blade half goes from the horizintal and passing below the
radiator it has a torsioan; input that is different that the rest of the
propeller arc. B And teh belt is way more than just a coupling stiffness
mechanism. How's that? well the teeth on the belt are teh shock
absorbers which give to reduce the harmonics. B It is kind of like a
rubber torsional coupling for a boat or anything that needs drive shaft
shock absorbing, just on a smaller basis but more of them. B In teh case
of a ICE th eidea is to reduce crank harmonics and preven them from
getting into the cam causing valve train B errors. Not to mention spark
timing issues. So I am still on board with cam drive belt systems. Just
wish I could afford one, lol...
But I like his motor! That is the one on my Turbo Sprint! A screaming
993 cc of turbo terror......maybe......
mayf
Kirkwood wrote:
>Mayf's timely question has raised another issue. If one was to believe
>advertising you would think that a belt drive was a magic excelsior to
>dampen all the bad harmonics coupled to the cam. Not being an engineer it
>sounded like a plausible solution. However, as a technocrat suspicious of
>unsubstantiated advertising, I am always looking for good data proving the
>supposition. I am still neutral about belt drive claims. Testing and
>engineering analysis to prove belt-drive claims is non-trivial and
>expensive. In Experimental Aviation a belt-drive-prop-reduction-unit has
>always claimed, among other things, to be beneficial due to its dampening
>characteristics. B So, in absence of good data, it is refreshing to see an
>interesting article that appears to debunk the status quo.
>
>http://www.eaa.org/experimenter/articles/2009-10_beltdrive.asp
>
>
>
>Knowledge is horsepower. Too much is a good thing :-)
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