Supercavitating Torpdeo Kinetic Energy
Recently, there have been a few comments asking about the kinetic energy of a supercavitating torpedo with the suggestion being that the kinetic energy, alone, makes the torpedo a one-hit killing weapon against any size ship – essentially vaporizing the target. Well, kinetic energy is easily estimated. Here's the calculation for the Russian Shkval supercavitating torpedo.
k.e. = 0.5 * m * v2
m = mass = 2700 kg; Russian Shkval torp
v = velocity = 100 m/s; 200 kts
so,
k.e. = 0.5 * 2700 kg * (100 m/s)*(100 m/s)
k.e. = 13,500,000 (kg*m2)/s2= 13,500,000 J
By comparison, a kg of TNT releases 4,184,000 J. Thus, the k.e. of the supercavitating torpedo is equivalent to around 3 kg of TNT. To put that into context, a U.S. Navy lightweight Mk54 torpedo has a warhead weight of 44 kg (we'll assume it's TNT even though it isn't). That means the supercavitating torp would have kinetic energy equal to 7% of the explosive energy of a Mk54 lightweight torpedo - not enough to even be noticed, by comparison and certainly not a one-shot kill/vaporize due to kinetic energy alone.
k.e. = 0.5 * m * v2
m = mass = 2700 kg; Russian Shkval torp
v = velocity = 100 m/s; 200 kts
so,
k.e. = 0.5 * 2700 kg * (100 m/s)*(100 m/s)
k.e. = 13,500,000 (kg*m2)/s2= 13,500,000 J
By comparison, a kg of TNT releases 4,184,000 J. Thus, the k.e. of the supercavitating torpedo is equivalent to around 3 kg of TNT. To put that into context, a U.S. Navy lightweight Mk54 torpedo has a warhead weight of 44 kg (we'll assume it's TNT even though it isn't). That means the supercavitating torp would have kinetic energy equal to 7% of the explosive energy of a Mk54 lightweight torpedo - not enough to even be noticed, by comparison and certainly not a one-shot kill/vaporize due to kinetic energy alone.
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