physicsstuff
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You can find spark distances P E-55 61st edition of Handbook of Physics & Chemistry. Partial list below: PKv needle points(in) 5cm spheres 5 0.42 .15 10 0.85 .29 20 1.75 .60 40 3.81 1.30 80 11.1 3.26 100 15.5 4.77 200 35.7 300 54.7 Maybe find data in Radio Amateurs Handbook (any old addition) Have fun... physicsstuff