Barry's Coilguns 

AC Linear Induction Motor

Temperature Rise in Utah ProjectileIt is estimated that the heat produced in the projectile by the highfrequency currents will be about twentyfive per cent greater than the equivalent kinetic energy of motion imparted by the thrust. The kinetic energy has been given as 41 x 10^{5} kilogram meters^{1} which is equivalent to approximately 96 x 10^{5} small calories. Adding twentyfive per cent brings the total heat energy to 12 x 10^{0} calories. Assuming that seventyfive kilograms of the projectile are available for absorbing heat, and that the average specific heat is about 0.25 calories per gram per degree Centigrade, we find the temperature rise from the following formula: where dt is the temtemperature rise in degrees Centigrade, H the heat
absorbed in calories, q the specific heat of the absorbing material,
and w the weight of the material in grams. By substitution in Equation 1, the temperature rise is found to be 640°
C. Actually, however, the interior of the projectile will be raised in temperature very little, because the storedup heat will be carried away by the sodiumpotassium alloy^{2} and by convection and radiation. ^{1} See pp. 147148 of the narrative. 



Last Update 20090226
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