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Old 12-03-2011, 02:51 PM   #1
Merc_Drew
 
Join Date: Dec 2011
Default A-10 attack aircraft stats

What book would that be in? If it is not in a book, can some people help me design it?

There are already stats for bombs and missiles , what I'm looking mainly for is HP armor and the Gatling gun stats (7 barrel 30mm)
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Old 12-03-2011, 04:37 PM   #2
Juca
 
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Default Re: A-10 attack aircraft stats

For the GAU-8A Avenger, its muzzle velocity is about the same as the M242 bushmaster from high-tech, so I think that we can eye-ball it from there. As it also shoots depleted uranium rounds like the M242, I'm suggesting something like:
GAU-8 DMG 6dx10(2) pi inc Range 4500/20000 acc 6+(whatever aiming system it does have, I have no idea), EWt. 620(only the weapon, but the full system is about 4000 pounds), RoF is 70, shots is 1150 (typical load), ST is higher than 30M, maybe up to 35M, Bulk is VERY high (the entire plane is built around it, I think that it is between -16 and -18), Rcl is 2, I don't know the costs of the thing.

I'm in a hurry, so later I will revise and post more.
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Old 12-03-2011, 04:41 PM   #3
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Default Re: A-10 attack aircraft stats

Quote:
Originally Posted by Juca View Post
For the GAU-8A Avenger, its muzzle velocity is about the same as the M242 bushmaster from high-tech, so I think that we can eye-ball it from there. As it also shoots depleted uranium rounds like the M242, I'm suggesting something like:
GAU-8 DMG 6dx10(2) pi inc Range 4500/20000 acc 6+(whatever aiming system it does have, I have no idea), EWt. 620(only the weapon, but the full system is about 4000 pounds), RoF is 70, shots is 1150 (typical load), ST is higher than 30M, maybe up to 35M, Bulk is VERY high (the entire plane is built around it, I think that it is between -16 and -18), Rcl is 2, I don't know the costs of the thing.

I'm in a hurry, so later I will revise and post more.
Bulk maxes out at -10; don't set it any higher than that.

EDIT: Without looking at similar weapons, I'd also eyeball the damage around 6dx5(2) pi++ inc. Armor penetration for a GAU-8A is apparently about 70mm (assume it's RHA), which is about 6dx10 damage - but then you divide the damage by 2, since it's got that (2) armor divisor.

Last edited by Langy; 12-03-2011 at 04:45 PM.
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Old 12-03-2011, 09:54 PM   #4
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Default Re: A-10 attack aircraft stats

Quote:
Originally Posted by Juca View Post
...acc 6+(whatever aiming system it does have, I have no idea), EWt. 620(only the weapon, but the full system is about 4000 pounds)...
From the DCS A-10C Flight Manual: The GAU-8/A is actually part of the larger A/A 49E-6 gun system that also includes the ammunition drum. The system weighs 4,200 lbs.
Not sure if that includes the ammo or just the empty drum, but I can tell you that 1150rds of Combat mix is approx 830kg by itself.

As for the acc/targeting system, I wouldn't hazard a guess in GURPS terms, but I can describe it. The pilot sees a pipper on the HUD that shows, with a high degree of accuracy, where a round fired right now would land. When the first stage of the trigger is squeezed, the Precision Attitude Control system kicks in. The PAC sends control inputs to the elevators and rudder to keep the nose of the A-10 oriented such that the point of impact stays stationary relative to the ground, correcting for wind and reducing range etc.

To sum all that up, the A-10 is significantly more accurate with cannon fire than other CAS aircraft, due to the accuracy of the cannon itself, plus the targeting system.
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Old 12-03-2011, 10:44 PM   #5
Juca
 
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Default Re: A-10 attack aircraft stats

Langy, bulk is higher than -10 for a lot of weapons in GURPS High-Tech... it maxes out at -10 only in Ultra-Tech.
About the damage, the M242, a 25mm cannon, does 6dx8(2) pi+ with APDSUPUD-T, it is only natural that the larger GAU-8 does more, but maybe the ammo isn't the same...
Now, for the aiming system, it sounds like that electronic aiming system described on High-Tech, that increases acc by +3, and maybe an Artillery Software, for an additional +1 or +2.
The weight includes the ammo too.
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Old 12-04-2011, 12:46 AM   #6
Langy
 
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Default Re: A-10 attack aircraft stats

Quote:
Originally Posted by Juca View Post
Langy, bulk is higher than -10 for a lot of weapons in GURPS High-Tech... it maxes out at -10 only in Ultra-Tech.
About the damage, the M242, a 25mm cannon, does 6dx8(2) pi+ with APDSUPUD-T, it is only natural that the larger GAU-8 does more, but maybe the ammo isn't the same...
Now, for the aiming system, it sounds like that electronic aiming system described on High-Tech, that increases acc by +3, and maybe an Artillery Software, for an additional +1 or +2.
The weight includes the ammo too.
Huh - you're right. Strange - a recent publication (one of the newer Pyramids) said that Bulk maxed out at -10, though that was for ultra-tech energy weapon design. Still, I see no reason why energy weapon bulk would max out at -10, but projectile weapon bulk wouldn't.
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Old 12-04-2011, 01:28 AM   #7
lexington
 
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Default Re: A-10 attack aircraft stats

Gathering some info from the net

The solid shot is .94 lb and goes 3225 fps and is 30mm wide.

That's 55.5 dice of damage or 6dx9 pi++

Converted to its infamous APDU round (not a saboted round, I checked) we get 6dx11(2) pi++. Penetrates 462 DR on average. That's more than six and a half inches of RHA equivalent.


And I just went looking through Ultra-Tech, assuming it would be easy to find something with more than Bulk -10. That's an incredibly strange rule. It's apparently even used for projectile weapons in UT even the 2000 pound cannon is -10.

Last edited by lexington; 12-04-2011 at 01:31 AM.
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Old 12-04-2011, 05:53 AM   #8
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Default Re: A-10 attack aircraft stats

For what it's worth here is a side-by-side comparison of modern light canon rounds. The 25x137mm (two examples, one green-cased and the other gray cased with a white tip) is fired from the M242 and the 30x173mm (orange tip) is fired from the navalized version of the GAU-8 used in the Goalkeeper CIWS.

The point is the GAU-8 round was compared to a glass 16oz Coke bottle and was and largely still is one of the largest 30mm rounds made. Comparing it to the 25mm round for the M242 Bushmaster is like comparing apples and oranges.
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Old 12-04-2011, 04:21 PM   #9
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Default Re: A-10 attack aircraft stats

Some comparisons for folks between the three main aircraft weapons that the US has used since the beginning of WWII:

The 0.50" bullet is about 13.6cm long. The projectile, about 12.7mm in diameter, is about 3.9cm long. The base, about 2cm in diameter, takes up the rest of the overall length.

The 20mm cannon shell is about 16.8cm long. The 20mm diameter projectile is about 6cm long. The base is about 2.8cm in diameter.

The 30mm GAU-8 round is about 28.5cm long. The 30mm projectile is about 11cm long. The base is about 4.2cm in diameter.

I'm using "about" because I basing the measurements on the rounds I have here, which I use as part of my duties at the Aerospace Museum of California. We have a Gulf War veteran A-10 there, btb.
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Old 12-05-2011, 08:22 AM   #10
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Default Re: A-10 attack aircraft stats

Quote:
Originally Posted by Merc_Drew View Post
Gatling gun stats (7 barrel 30mm)
The GAU-8/A has these stats:

GE GAU-8/A, 30173mm 6d6(2) pi++ inc 6 3,000/10,000 618/1,784 65 1,174 35M -12 2

Dmg is for the PGU-14/B APDU cartridge; the PGU-13/B SAPHE has Dmg 6d5 pi++ with 3d+1[1d+2] cr ex. Note that RoF is fixed at 65. The original gun installation had RoF 35/70, but this was changed in the 1980s.

Cheers

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