Re: Message to Bertie.

bertietaylor <bertietaylor@myyahoo.com> wrote:

On Sat, 9 Nov 2024 0:41:01 +0000, bertietaylor wrote:
 

On Fri, 8 Nov 2024 21:29:06 +0000, Jim Pennino wrote:
>

bertietaylor <bertietaylor@myyahoo.com> wrote:

On Fri, 8 Nov 2024 16:02:42 +0000, Jim Pennino wrote:
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bertietaylor <bertietaylor@myyahoo.com> wrote:

>
<snip old crap>
>

Fool, with the low voltage given and its huge mass the momentum of the
armature beats that of most high power rifle bullets.

>
Utter nonsense, crackpot.
>
Railguns don't have an armature, they fire projectiles through the air,
crackpot.

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The projectile is the armature, of the linear motor that in this case is
the railgun, Penisnino, most extraordinary ignoramus.

>
The muzzle energy of the very common 7.62x51mm NATO cartridge is
typically around 3,346 J.

>
Weight of bullet is say 7g
Muzzle velocity is 300m/s
So ke is 0.5mv^2=0.5*.007*300^2=.0035*90000=3150J so okay

>
The muzzle energy of the very common 5.56x45mm NATO cartridge is
typically around 1756 J.
>
What is the muzzle energy of your low speed linear motor, crackpot?5

0.5*4000*1.5^2= 2000*2.25=4500J, Penisnino

 
Sorry we made a mistake above, it should be
0.5 * 4 * 1.5^2 = 4.5 J and not 4500J.
 

which is greater than 3346J or 3150J or 1756J.

 
We were wrong, but in Arindam's railgun design we do not talk of energy
except for efficiency we talk momentum.

Railguns, actually ALL guns, are ALWAYS specified in energy as that is
the important parameter and no one cares about momentum, crackpot.

<snip remaining babble unread>