Muzzle velocity on a 9x19mm is about 400m/s.
Makes 6.4cm barrel.... about 2.5 inches at TL-10

That's shorter than a gunpowder pistol barrel and a little quicker projectile.
Doesn't seem to match real life.

On Wed, Sep 23, 2020 at 10:06 PM <xxxxxx@gmail.com> wrote:
>
> 1.Barrel Length: The length of the barrel is a function of tech level and muzzle velocity. Higher velocities require longer barrels to provide the necessary acceleration, while advances in technology allow higher acceleration in shorter distances (thus allowing shorter barrels). Barrel length is determined using the following formula:
> Lb = V+100TLm
> Lb: Length of barrel in centimeters.
> V: Muzzle velocity in meters per second. (Step 1)
> TLm: Tech level multiplier, as shown in the next column:
> TL        TLm
> 10        1.6
> 11        1.3
> 12        1.0
> 13        0.8
> 14        0.6
> 16+       0.4
>
> So, notice they say that higher velocities require longer barrels (for a given TL) and advancing TL allow higher acceleration in shorter velocities.
>
> So if I wanted to have 1600 m/s as my muzzle velocity, at TL 10. So my barrel length according to this calculation is:
>
> Lb(cm) = 1600 / (100 * 1.6) = 1600/160 = 10 cm
>
> Let's try to up the velocity to 3200 m/s.
> Lb(cm) = 20 cm
>
> So let's look at TL 12 then which should need shorter barrel lengths
>
> 1600 m/s.
> Lb(cm) = 1600 / (100 * 1.0) = 1600 / 100 = 16 cm
> 3100 m/s
> Lb(cm) = 3200 / (100 * 1.0) = 32 cm.
>
> Hmmmm.... DOES NOT LOOK RIGHT.
> No errata in as of CONSOLIDATED TNEERRATA, v0.02(09/19/09) for TNE.
>
> a) Is there a newer TNE errata?
>
> b) if not, I suggest one of two changes to the equation on page 102
> Lb(cm) = (V / 100) * TLm
> So, TL-10, 1600 m/s:
> Lb(cm) = (1600/100) * 1.6 = 16 * 1.6 = 25.6 cm  (10")
> TL-10, 3200 m/s
> Lb(cm) = (3200/100) * 1.6 = 51.2 cm (18")
> At TL-12, 1600 m/s:
> Lb(cm) = (1600/100) * 1.0 = 16 cm (6")
> At TL-12, 3200 m/s:
> Lb(cm) = (3200/100) * 1.0 = 32 cm (11")
> TL-14, 1200 m/s:
> Lb(cm) = (1600/100) * 0.6 = 9.6 cm (4") - this one is a pistol when it used to be a carbine at TL-10
> TL-14, 3200
> Lb(cm)= (3200/100 * 0.6 = 19.2 cm (8") this is a carbine when it used to be an AR.
> At TL-14, 5000 m/s:
> Lb(cm) = (5000/100) * 0.6 = 30 cm (12")
>
> Those all seem more manageable values and they get shorter with higher tech level for the same energy.
>
> Thoughts?
>
> --
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>
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