Bishop Steiner, on 08 July 2012 - 07:14 AM, said:
Seems I should have jumped to page two.... your points and mine being nearly identical. And hey, if ther eis one thing a Davy like you should know, it's AutoCannons!
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So to expand on that, here are some personal estimates I like to use:
AC-2:
Caliber Range: 20mm to 40mm
Muzzle Velocity Range: 800-1700 m/s
Basis:
M61 Vulcan,
GAU-8 Avenger,
RARDEN,
Rheinmetall MK 20 Rh 202,
Bofors 40 mm
AC-5:
Caliber Range: 50mm to 90mm
Muzzle Velocity Range: 550-1130 m/s
Basis:
5 cm Pak 38,
90 mm Gun M1/M2/M3,
Cannone da 90/53,
Ordnance QF 75 mm,
Bofors 57 mm Gun
AC-10:
Caliber Range: 100mm to 140mm
Muzzle Velocity Range: 590-1750 m/s
Basis:
BL 5.5 Inch Medium Gun,
13.5 cm K 09,
BL 4 Inch Naval Gun Mk VII,
D-10 Tank Gun,
Rheinmetall 120 mm Gun
AC-20:
Caliber Range: 150mm to 203mm
Muzzle Velocity Range: 300-950 m/s
Basis:
8"/55 caliber gun,
20.3 cm K (E),
15 cm K (E),
Skoda 150 mm Model 1918
Based on the above, I would suggest the following values for average muzzle velocities:
AC-2: ~1500 m/s
AC-5: ~1200 m/s
AC-10: ~900 m/s
AC-20: ~600 m/s
Canon effective ranges (based on the "long" ranges listed
here and "1 hex = 30 meters"):
AC-2: 720 meters
AC-5: 540 meters
AC-10: 450 meters
AC-20: 270 meters
This would give average travel times of:
AC-2: 0.48 seconds
AC-5: 0.45 seconds
AC-10: 0.50 seconds
AC-20: 0.45 seconds
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As seen in the various linked-to real-world weapons, having a lower muzzle velocity for larger weapons would actually be both normal and realistic.
As such, I would imagine that, in terms of ROF, the AC-2s (~20-40 mm) would behave more like very large SMGs and AC-5s (~50-90 mm) would behave more like very large ARs while AC-10s (~100-140 mm) would behave more like
tank guns and AC-20s (~150-203+ mm) would behave more like direct-fire versions of heavy artillery (
howitzers and
naval artillery).
It should be noted that the caliber ranges above are
estimates/rules-of-thumb on my part, and that ACs in BT/MW are classified by damage output rather than by caliber (that is, a 20 mm AC that fires two shells per second and a 40mm AC that fires one shell per second can both be "AC-2s" as long as each deals around two units of damage to 'Mech armor over a ~10 second period).
Your thoughts?