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Thornily Rating Calculator and what 600 fps can do.

A place to ask general spud cannon related questions.
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Thornily Rating Calculator and what 600 fps can do.

Unread postAuthor: boyntonstu » Sat Aug 08, 2009 9:30 am

Thornily Rating Calculator and what 600 fps can do.

http://www.beartoothbullets.com/rescour ... =.5&v2=600


Relative Stopping Power Scale of 71 with a 400 grain bullet, a velocity of 600 fps., and diameter of .5

Compare to the below chart to find out how adequate your firearm is for what your hunting. (Suggestions below are relative stopping power points necessary to cleanly harvest the listed species under any condition.)

45 Antelope
50 Deer
100 Black Bear (To account for 350- 500 lbs. bear.)
120 Elk, Moose, Kudu, Zebra, Large African Safari Plains Game
150 Lion, Leopard, Grizzly Bear, Brown Bear
250 Hippopotamus , Rhinoceros, Cape Buffalo, Elephant

You can see how much relative damage you can do with your cannon by using the Thornily rating.

I posted this information to show the power of various projectiles vs speed ec. and it is NOT intended to encourage shooting at anything that is alive.

A BTB marble shooter at 600 fps (2x slingshot speed) would cause a LOT of destruction.

BoyntonStu
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Last edited by boyntonstu on Sat Aug 08, 2009 9:53 am, edited 1 time in total.
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Unread postAuthor: jeepkahn » Sat Aug 08, 2009 9:50 am

Decimater is good for 460 on the thornily scale with a 1" ballbearing... http://www.beartoothbullets.com/rescour ... .0&v2=1000


dd1 is good for 308, http://www.beartoothbullets.com/rescour ... .7&v2=1000
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 08, 2009 10:01 am

jeepkahn wrote:Decimater is good for 460 on the thornily scale with a 1" ballbearing...


Impressive, no doubt a function of the massive diameter which would create a devastating wound channel. That's over half what you'd get from the 700 nitro express, pachyderms shouldn't be a problem :D
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Unread postAuthor: boyntonstu » Sat Aug 08, 2009 10:03 am

jeepkahn wrote:Decimater is good for 460 on the thornily scale with a 1" ballbearing... http://www.beartoothbullets.com/rescour ... .0&v2=1000


dd1 is good for 308, http://www.beartoothbullets.com/rescour ... .7&v2=1000


Congratulations!

Your Decimater cannon exceeds the power of most guns; handle with care.

I believe that a 600 fps slingshot is also a very capable tool.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 08, 2009 10:11 am

boyntonstu wrote:I believe that a 600 fps slingshot is also a very capable tool.


... if the projectile is heavy and big enough.

In terms of bringing down live targets (hypothetically of course, as this discussion doesn't really belong on this forum) you need a big projectile that will leave a large diameter wound channel, if you double the diameter then the area of tissue destroyed through which the quarry will lose fluids increases fourfold.

Mass is also important as it prevents the projectile from slowing down quickly, enabling it to penetrate further and reach and destroy any vital organs in its path.
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Unread postAuthor: inonickname » Sat Aug 08, 2009 10:12 am

I wonder what I could get with a q-tip. I'd be willing to bet more than the average UK legal springer, seen as average muzzle energy would be around 13-14 ft/lbs of energy..

Nvm, with some optimization, NOT including compression heating I get 19 fpe..

It doesn't seem to think much of 2mm diameter projectiles... I think I'll go cry. It doesn't care if they're going 1700 FPS or not..
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Unread postAuthor: mobile chernobyl » Sat Aug 08, 2009 10:13 am

10 gallon shooting it's venerable 20oz soda... filled with concrete (appx 18 ounces weight when full or appx 7875 grains) at a modest 400fps, and 3" bore.

3,847 units.

BOSS gun at 300 psi shooting marble (3.84 grams =appx 60 grain) at around 1100fps with a .62" bore.

22 units...

I know which one I'm bringing squirrel hunting next time ;) make that elephant hunting.

According to their scale I'll have killed an elephant over 15 times with one shot from 10 gallon lol.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 08, 2009 10:17 am

inonickname wrote:It doesn't seem to think much of 2mm diameter projectiles... I think I'll go cry. It doesn't care if they're going 1700 FPS or not..


Hardly surprising, for the reasons which I outlined out above. Such a tiny puncture wound is not going to destroy much tissue or cause massive bleeding, even if it goes straight through the quarry.

This calculator does however ignore a tumbling or fragmenting projectile that would carve out a different sort or pattern of increased potential lethality.

edit: I punched in the numbers for the APCR round from the late war 88mm anti-tank gun, and got a factor of 602,961 :D

Or for those of you who fancy taking Dora hunting, the factor is 3,160,121,064 for a 7 ton shell :D :D :D
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Unread postAuthor: jeepkahn » Sat Aug 08, 2009 11:16 am

Anybody punched in Lardas Hygac... or pipedream :twisted:
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 08, 2009 11:21 am

jeepkahn wrote:Anybody punched in Lardas Hygac... or pipedream :twisted:


I doubt they could top the best the US Navy can offer, at 295,814,815 ;)
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Unread postAuthor: D_Hall » Sat Aug 08, 2009 12:41 pm

Vera (if she holds to design specs)...

Relative Stopping Power Scale of 5,003,704 with a 700000 grain bullet, a velocity of 1000 fps., and diameter of 19.000".
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 08, 2009 12:46 pm

To be expected given the massive diameter :) but is it right to name such an awesome beast after what is essentially a glorified Saiga 12 bore?
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Unread postAuthor: Ragnarok » Sat Aug 08, 2009 1:23 pm

I think this may be getting on the side of dodgy rules wise, because it's talking about stopping power in living targets.
However, until a mod takes offence, I'll leave it.

~~~~~

For reference, (so you know what numbers are doing what) the Thornily equation is:
FPS * Weight in Pounds * SQRT(Projectile Diameter in inches) * 2.866

Don't ask why it's got a 2.866 factor on it. Given it's a relative measure, were I doing it, I would have just left it out to make it easier to remember.

Also, in metric, with the easier to remember factor:
13 * MPS * kg * SQRT (Diameter in cm)

~~~~~

I'd also like to ask what the point is in punching in random artillery pieces? Given the fact that artillery weapons don't work by direct target impact, I might as well shout random numbers with no relevance to what we're talking about.
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Unread postAuthor: D_Hall » Sat Aug 08, 2009 1:23 pm

jackssmirkingrevenge wrote:To be expected given the massive diameter :) but is it right to name such an awesome beast after what is essentially a glorified Saiga 12 bore?


Absolutely... In the words of Jayne Cobb, "It is my very favorite gun."

(I'm talking about Vera, not Vera) ;)
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 08, 2009 1:33 pm

Ragnarok wrote:I'd also like to ask what the point is in punching in random artillery pieces? Given the fact that artillery weapons don't work by direct target impact, I might as well shout random numbers with no relevance to what we're talking about.


We might yet be attacked by Godzilla, it would be good to know we have the stopping power to take it down :D

One last one please and I'll stop, a V2 at impact would be 12,537,777,778 ;)
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