GURPS ULTRATECH ballistics?

hal · 04-03-2017, 09:43 AM

This isn't a dig against your work Hans. The formula I used pretty much maches the samples from GURPS ADVENTURE GUNS, which seemed pretty convincing the formula works. Were I to compare old GURPS stats against the new, I'd expect there would be those that didn't match as the formulas seem to be different.

So - the reversed formula gets the job done for black powder weapons, but not for the H&K G11. I did allow for the possibiliy that it might be off and you'd be aware of why. You've just confirmed it now. ;)

The fine tuning aspect, implies things to me that either more goes into the damage formula than Doug's Formula provides, or that David's Formula isn't exact enough that it requires Tweaking. Since the formula isn't readily a available, all we can do is compare results between the one formula's results against the published material and try to figure out why.

I doubt that every gun that ever existed will be statted out by SJGames. If some wants to stat out a gun for their campaign using real world stats - this would be one way to go about it. Doug's formula combined with published data on ammunition stats, gives a baseline only. When the published material specifies a given mass for the bullet, what gun was used to fire that bullet? What was the barrel length? What other factors can come into play? But, until the design formulas for guns are published akin to what was in GURPS VEHICLES, we can only speculate

04-03-2017, 09:43 AM	#16
hal Join Date: Aug 2004 Location: Buffalo, New York	Re: GURPS ULTRATECH ballistics? This isn't a dig against your work Hans. The formula I used pretty much maches the samples from GURPS ADVENTURE GUNS, which seemed pretty convincing the formula works. Were I to compare old GURPS stats against the new, I'd expect there would be those that didn't match as the formulas seem to be different. So - the reversed formula gets the job done for black powder weapons, but not for the H&K G11. I did allow for the possibiliy that it might be off and you'd be aware of why. You've just confirmed it now. ;) The fine tuning aspect, implies things to me that either more goes into the damage formula than Doug's Formula provides, or that David's Formula isn't exact enough that it requires Tweaking. Since the formula isn't readily a available, all we can do is compare results between the one formula's results against the published material and try to figure out why. I doubt that every gun that ever existed will be statted out by SJGames. If some wants to stat out a gun for their campaign using real world stats - this would be one way to go about it. Doug's formula combined with published data on ammunition stats, gives a baseline only. When the published material specifies a given mass for the bullet, what gun was used to fire that bullet? What was the barrel length? What other factors can come into play? But, until the design formulas for guns are published akin to what was in GURPS VEHICLES, we can only speculate