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HBOMBS Particles And More
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sn0wsh00 23 Aug, 2017 @ 4:34pm
HBOMBS yields
I thought it would be fun to estimate the yields of some of the HBOMBS if the HBOMBS explosions in SFM/GMOD were to scale. Here are the estimated yield I calculated based on airburst fireball radius:

Hbomb
PCF
Fireball rad. (Valve)
HBOMB rad. (m)
Yield (kT)
Castle Bravo
h-nuke4
6300
120.02
24.24
Davy Crockett
hbomb-small
1000
19.05
0.24
Fat Man
hbomb
2800
53.34
3.19
Mk33 (Grable)
h-nuke
3800
72.39
6.85
Ivy King
h-nuke5
3600
68.58
5.98
Ivy Mike
hnuke2
7500
142.88
37.48
Little Boy
h_nuke2
2800
53.34
3.19
Megaton Bomb
hnuke3
6000
114.3
21.46
Trinity
h-nuke3
4000
76.2
7.79
Tsar Bomb
hnuke1
8000
152.4
44.04

The formula to calculate yield based on airburst fireball radius is y=0.00015*r^(2.5), where y is the yield in kilotons and r is the fireball radius in meters. This formula was derived from the nuclear weapons effect calculator found on this page[www.alternatewars.com].

I didn't get the fireball radii from Valve's particle editor due to how some of the radius values seemed a little off. For example, the particle editor says that the Tsar Bomb and Little Boy both have the same radius_min and radius_max, even though the Tsar Bomb fireball is clearly much larger than the Little Boy fireball in SFM/GMOD. Instead, I created a map for Source Filmmaker that was essentially a giant ruler and measured the fireball radius inside of SFM. The map can be downloaded here:
https://sn0wsh00.deviantart.com/art/SFM-HBOMBS-airburst-comparisons-700729510





Last edited by sn0wsh00; 6 Sep, 2017 @ 3:43pm
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sn0wsh00 24 Aug, 2017 @ 3:07pm 
And here are what the fireball radii should be based on the actual yields of the weapons:
Hbomb
Real Yield (kT)
HBOMB rad. (m)
Calc. fireball rad. (m)
Scale
Castle Bravo
15,000
120.02
1,569.89
13.08
Davy Crockett
0.02
19.05
7.01
0.37
Fat Man
21
53.34
113.32
2.12
Mk33 (Grable)
15
72.39
99.05
1.37
Ivy King
500
68.58
402.74
5.87
Ivy Mike
10,400
142.88
1,355.96
9.49
Little Boy
15
53.34
99.05
1.86
Megaton Bomb
1,000
114.30
531.41
4.65
Trinity
20
76.20
111.13
1.46
Tsar Bomb
50,000
152.40
2,541.10
16.67

I was actually surprised by how close some of the HBOMBS fireball radii were compared to the real thing. In fact, the Davy Crockett airburst fireball in HBOMBS is actually larger than a fireball produced by a real Davy Crockett nuke!

A lot of these fireballs can fit inside a Source Engine map if they were scaled up to actual size. A Source Engine map has dimensions of 32,768x32,768x32,768 in Valve units, which translates to about 2048'x2048'x2048' or 624m x 624m x 624 m (16 Valve units = 1'). With these dimensions, a Source Engine map can probably fit a airburst fireball created by a 264 kT nuke.

HBOMBS' mushroom clouds, on the other hand, are stout to say the least. The (real) Trinity test, with a 20 kT yield, created a mushroom cloud 7.5 miles high. By comparison, the Tsar Bomba in HBOMBS, which creates a fireball the same as a 44 kT airburst nuke, probably rises no more than 2000', given that it fits inside the map. In other words, while the mushroom clouds in GMOD may look large, they don't even come close in size compared to their real life counterparts.
Last edited by sn0wsh00; 6 Sep, 2017 @ 3:44pm
#1
sn0wsh00 24 Aug, 2017 @ 4:32pm 
And here are how all these airbursts look like in SFM:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1119373263

The Grable shot had some material errors, hence there's only a fireball for Grable as opposed to the whole airburst. The map in this collage can be downloaded here:
https://sn0wsh00.deviantart.com/art/SFM-HBOMBS-airburst-comparisons-700729510
Last edited by sn0wsh00; 24 Aug, 2017 @ 4:41pm
#2
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