Re: Why use Watts on Ergs???

paul_v_smith@xxxxxxxxxxx wrote:
On Oct 8, 9:54 am, kc <kc_n...@xxxxxxxxx> wrote:
Curious - how do you measure the grouping? I have no idea, but I would
guess you'd report the maximum distance between any two target holes.
Isn't 0.176" less than the caliber of the bullet? If so, how do you
measure that distance? Or were you shooting BBs? :^)

-KC

It's called a CTC (Center to Center) measurement, calculated by
measuring the extreme boundary edges of the impacts and subtracting
the caliber. i.e. A single hole would be a 0.000" group (well not
really a group, as it was only one shot, but surely you get the
idea.).

I guess we can't all be Robin Hood. :^)
(2 shots one hole).

Good to see that you know your BB's, almost. (0.177" BTW)

Lucky guess. I was just trying to think of the smallest caliber "bullet" I could think of. Is there something smaller than a BB that some guns fire/shoot? "Pellets" are the same caliber as BBs right?

If you are asking about the "Power" unit, under the Spike Data in the
Text Log view, it's the Watts being absorbed by the flywheel at that
given moment.

No it isn't. Watts = force on the handle * velocity of the handle, at any given instant. Take the handle velocity at the same moment, and the handle force at that moment, and you get the Watts absorbed by the flywheel at that moment. This is not the number EM reports. Check it yourself, it's easy enough since EM also reports instantaneous handle velocity and handle force.

(Of course it says that when the unit is selected,
can't you read?)

Yes, which is why I brought this up. Your software says one thing, but when I do some simple math to check, it doesn't match. So maybe you need to just change the description of those numbers, as unless I'm mistaken somewhere, they are not Watts absorbed by the flywheel at that moment. Maybe have EM say something like "We have no idea what these numbers are, but maybe you the user might find them interesting." Saying that they are instantaneous Watts is AFAICT, wrong and misleading.

Alternatively, if you want to make EM report the correct values that you're trying to report, all you have to do is remove (don't report in the spike data) the current erroneous "Power" numbers, and just insert a few lines of code that multiplies handle force * handle velocity at a given instant in time, and you're golden. I did the same thing in my own (MATLAB) code when I was using EM's spike data output.

This BTW, is what's called a user bug report. You're the only software vendor/manufacturer I've EVER come across who's been so opposed to & closed minded about such a thing. You have, AFAICT, a mistake in your product, the fix is easy, and yet you have thus far refused to acknowledge it or even explain it.

As for the rest, just more of the same idiocy I see from you when you
get bent. Bub-bye now....

Not 'bent' at all. Perfectly cool, calm, collected, and content.

-KC
.

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