Last week, Leigh helped me run some tests on the spark plugs that we got from NGK. The spark plugs that we tested are: R0045J-9, B7S, BM6F and BPR6EGP. It turns out that the B7S and BM6F work best. The next step would be to see how well they light up kerosene and liquid oxygen.
I recently finished drawing the augmented spark chamber with SolidWorks, and I hope to get it machined soon.