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So since those Kinetic Energy feats weren't acceptable, it's time I move on to the other calcs I made.

AP Feats

Hookfang Destroys a Tree

(Evaluated as "fine")

In Dragons: Defenders of Berk Ep. 15, Hookfang breathes some fire at a pine tree, reducing it to ashes in seconds. I'll be using the formula for heat increase, so I'll find mass first.

A quick Google search tells me that pine trees can grow to 150ft tall, or 46m.

How-to-Train-Your-Dragon-Tree-Destruction

Height=554px=46m

Width=28px

Height Destroyed=432px

46/554=0.083m/px

28*0.083=2.3m, 1.15m radius

432*0.083=36m

π*1.15^2*36=149.57m^3, or 5,282ft^3

Average density of pine wood is 30lb/ft^3

5282*30=158460lbs, or 71,876.3kg

To find change in temperature, I started with a room temperature of 20 C. According to https://sciencing.com/hot-bonfire-8770.html, the charcoals of a bonfire exceed temperatures of 1,100 C. Seeing as there were no coals left over, I'm going to use this value for my calc.

1100-20=1080 C

Plugging my values into this calculator https://www.omnicalculator.com/physics/specific-heat (and choosing wood as my substance), I get a result of 1.32e11 Joules, City Block level. This would probably scale to a majority of dragons.

Stormfly Melts a Boulder

(Evaluated as "fine")

In Dragons: Defenders of Berk Ep. 15, Stormfly up & melts a boulder/rock formation in the ocean. I'll treat the rock as a cylinder & use the formula for increasing temperature. First, I'll find mass.

How-to-Train-Your-Dragon-Rock-Destruction

Stormfly=9.14m=320px

Rock Height=594px

Rock Diameter=258px

9.14/320=0.03m/px

594*0.03=17.82m

258*0.03=7.74m, 3.87m radius

π*3.87^2*17.82=838.45m^3

According to http://www.greenspec.co.uk/building-design/thermal-mass/, density of stone is 2,300kg/m^3.

838.45*2300=1928435kg

Also according to the link above, the specific heat capacity of stone is 1000 J/kg K.

Finally, we find change in temperature. Starting with a room temperature of 20 C, magma can reach heats up to 1600 C.

1600-20=1580 C

Plugging all this into this calculator https://www.omnicalculator.com/physics/specific-heat, I get 3.05e12 Joules, Multi-City Block level+. Deadly Nadders have notoriously hot fire (said to be as hot as the Sun even), so I doubt this'd scale to most dragons.

Striking Strength/Durability Feats

Screaming Death Smashes Rocks

(Evaluated as "fine")

In episode 4 of Defenders of Berk, the Screaming Death smashes through some rock formations. You can just barely see Toothless behind the very blurry rock.

How-to-Train-Your-Dragon-Rock-Size

Toothless=346px=8m

Rock Height=632px

Rock Diameter=315px

8/346=0.02m/px

632*0.02=12.6m

315*0.02=6.3m, 3.15m radius

π*3.15^2*12.6=392.77m^3, 392770000

I'm almost positive that this is Violent Fragmetation, so.

3.9e8*69=2.7e10 Joules, Large Building level+. This is probably a lowballed value since the whole rock wasn't on screen.

Thunderdrum Smashes Rocks

(Evaluated as "fine")

In Episode 19 of Riders of Berk, a Thunderdrum smashes some rocks. Dragon sizes can be kind of inconsistent, but Gronckle should be pretty safe. Meatlug here is slightly shorter than Fishlegs, who's about 5'9", so I think it's safe to assume she's 1.5m tall.

How-to-Train-Your-Dragon-Rock-Size-2

Meatlug=52px=1.5m

Rock Height=203px

Rock Diameter=37px

1.5/52=0.0288m/px

203*0.0288=5.8m

37*0.0288=1m, 0.5m radius

π*0.5^2*5.8=4.56m^3, 4560000 cm^3

Once again, Violent Fragmentation.

4.5e6*69=3.1e8 Joules, Small Building level. This should be good to scale most dragons to.

Skullcrusher Knocks Over a Rock

(Unevaluated)

In S1 Ep8 of Race to the Edge, Skullcrusher knocks over a big rock.

Mass

Judging by this image [1], Skullcrusher's about 3.35m tall. Pixel scaling is weird cause motion blur, but should be fine.

Skullcrusher-Rock

Skullcrusher=54px=3.35m

Rock Diameter=682px

3.35/54=0.06m/px

682*0.06=41m diameter

Skullcrusher-Rock-2

Bottom Rock Diameter=271px=41m

Bottom Rock Height=250px

41/271=0.15m/px

250*0.15=37.5m

π*20.5^2*37.5=49509.54m^3

Middle Rock Diameter=235px

Middle Rock Height=198px

235*0.15=35.25m

198*0.15=30m

π*17.6^2*30=29194.19m^3

Top Rock Diameter=269px

Top Rock Height=99px

269*0.15=40.35m

99*0.15=15m

π*20^2*15=18849.56m^3

49509.54+29194.19+18849.56=97553.29‬m^3

97553.29‬*1602=1.56e8kg, Class M

Kinetic Energy

Here, I'm gonna take the height of the rock, & use it as radius to find circumference. Then I'll use 1/4 of that circumference as distance traveled.

37.5+30+15=82.5m

π*165=518m

518*0.25=129.5m

From when Skullcrusher hit it, to the rock hitting the ground, about 2 seconds pass.

129.5/2=64.75m/s

1.56e8*0.5*64.75^2=3.2e11 Joules, City Block level+. Looks good for general dragons.

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