Exactly what does 4.3 t.p.s.i. translate into in psi? Does the 4.3 t.p.s.i translate to long ton= 2240 or the short ton 2000.

2240 X 4.3 = 9632 psi?

2000 X 4,3 = 8600 psi?

els,

In the late 1800's the British measured rifle service pressure by compressing a copper cylinder axially and measured the degree of compression in tons per square inch. This method was called the Base Copper Crusher method. You may be able to search this for more detail.

I don't believe you can directly convert this method to pounds per square inch by a multiplier.

els, Long tonnes.

Keith

els:

In what context did you see the reference to "4.3 tpsi"? At this pressure level, this is either LUP (lead crusher) or PSI (transducer), which are not readily convertible. Yes, it's long tons.

BaseCUP has nothing to do with it.
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"Serious rifles have two barrels, everything else just burns gunpowder."

Greame's book Shooting The English Double Rifle. In the paradox section.Wouldn't it be wonderful to have a pressure set up to measure base pressure the way it was originally done. I'll bet that with a Oeler (spelling) piezo pressure testing system some of the machinist types could figure a way to do it.

els,

It makes no difference what context you saw the reference. It is a unit of measurement. It is originally measured in copper cylinder compression. Neither LUP nor PSI has anything to do with it.

Oh! And what about CUP?
Peter.

Peter,

What is CUP and how do you relate CUP to TPSI?

quote:

Originally posted by els:
Greame's book Shooting The English Double Rifle. In the paradox section.

Thanks, I thought so. This is lead crusher. Like everyone else, the British standardized on lead units of pressure for shotgun applications (which includes paradoxes) because lead crushers provided a more accurate measurement at the low pressures involved. Also like everyone else, because lead crusher measurements weren't reliable at higher pressures, the British standardized on copper crushers to measure the pressures of rifle cartridges. The British differed here in that they used copper crushers to measure bolt thrust (BaseCUP), instead of chamber pressure (CUP) like everyone else did.

To answer your question, as well as Peter's, LUP and CUP are different yardsticks used to measure the same thing, depending on pressure level, as PSI, but they're crusher methods as opposed to a piezo electric transducer. As such, neither are readily convertable to PSI, because their relationships to PSI are not constant across all pressure ranges. BaseCUP (the long time standard for British rifle cartridges) isn't related to LUP, CUP or PSI, as it measures something different entirely.
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"Serious rifles have two barrels, everything else just burns gunpowder."

quote:

Originally posted by Buliwyf:
els,

It makes no difference what context you saw the reference. It is a unit of measurement. It is originally measured in copper cylinder compression. Neither LUP nor PSI has anything to do with it.

Careful, 400, Bullwinkle is armed with a book and perceptions:

quote:

Posted 10 Feb, 4:23 PM
Also, I have read Graeme Wright's work Shooting the British Double Rifle and here again my perception was adjusting barrel loads for accuracy.

And he is an authority on double rifles even though Bullwinkle says

quote:

Posted 12 Feb, 11:30 AM
Bill,

I don't have a double rifle.

Just be glad that Bullwinkle does not jest, and is not one to argue

quote:

Posted 20 Apr, 11:22 PM
Bulldog563 and others,

No. I'm not kidding with you....

No. I'm not argumentative.

Bullwinkle is SERIOUS! He owns a BOOK! He has PERCEPTIONS! And, Bullwinkle don't PLAY!

If you are not careful, he will get down with his bad self and call you a CRONY! HAH!

quote:

Originally posted by Jim Manion:
If you are not careful, he will get down with his bad self and call you a CRONY! HAH!

YIKES! You don't think that he would (gulp) accuse me of being "pompous, arrogant, and condescending" do you? Ah don't think Ah could bear it.
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"Serious rifles have two barrels, everything else just burns gunpowder."

Careful now. Bullwinkle does not kid.

He lists his location as:
Location: Where the pine trees touch the sky

He could be lurking near you in a pine grove.

lup - lead unit of pressure - shotgun use
CUP - copper unit of pressure - rifles
PSI - absolute measurement of pressure
Strain gauge - inferred measurement of pressure

there is no "fixed" way of converting CUP to PSI, though they are more or less the same at 28K, and about 6500 Different at 55kcup =about 62,500 PSI, and 44Kcup is about 50kpsi.

there is a CATCH though, on shotguns, as for a time those were not measured in the chamber, rather some distance ahead, according to Ellis Brown.

4.3tonnes (note: NOT ton) is slightly less than 9.6K psi

jeffe