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T = (K * D2) / L
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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Blu
Re: T = (K * D2) / L
Busy here, I'm out twice a day keeping trails and a long driveway clear of snow. I also plough a trail and driveway for an elderly neighbour lady who's a bit too old for moving snow around so she can take her pups out as well.
Blu
Blu
Re: T = (K * D2) / L
Greenhill?
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pe4king
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Re: T = (K * D2) / L
WHOOOOOOOOOOOSH !!
and I didn't even have to duck
and I didn't even have to duck
What is a Sapper? This versatile genius condenses the whole system of military engineering and all that is useful and practical. He is a man of all work of the Army and the public ready to do anything or go anywhere, in short, he is a Sapper.
Re: T = (K * D2) / L
Alfred George Greenhill, 1847-1927...
Calculation of optimal twist rate for a lead core bullet with a copper jacket?
T = rifling twist in inches
K = a constant = 150 Greenhill (for muzzle velocity of 457 to 853m/s), 180 - for the muzzle velocity of over 853m/s and 125 - for pistols. (Or whatever these values are for muzzle velocity converted to fps)
These constant values are valid for lead core bullets with a jacket made of copper or brass.
D = bullet diameter in inches
L = length of the bullet in inches
I'm sure ovenpaa will probably enlighten us further.
Calculation of optimal twist rate for a lead core bullet with a copper jacket?
T = rifling twist in inches
K = a constant = 150 Greenhill (for muzzle velocity of 457 to 853m/s), 180 - for the muzzle velocity of over 853m/s and 125 - for pistols. (Or whatever these values are for muzzle velocity converted to fps)
These constant values are valid for lead core bullets with a jacket made of copper or brass.
D = bullet diameter in inches
L = length of the bullet in inches
I'm sure ovenpaa will probably enlighten us further.
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billgatese30
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Re: T = (K * D2) / L
So it would seem.ovenpaa wrote:Greenhill?
Where by
T = pitch of 1 revolution
D = projectile diameter
L = projectile length
K = Greenhill Constant
Isn't Google brilliant.
D'oh, beaten to it
Chris
Re: T = (K * D2) / L
I cannot really add to what has been said other than I recognised it. I can still quote obscure mathematical formulae from nearly four decades ago, last used in exams in 1975...
I remember things only if they interest me.
I remember things only if they interest me.
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Doz
Re: T = (K * D2) / L
Couldn't have put it better myself...pe4king wrote:WHOOOOOOOOOOOSH !!
and I didn't even have to duck
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John25
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GazMorris
Re: T = (K * D2) / L
Wrong, but occasonally useful.John25 wrote:T = (K * D2) / L
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Gaz
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