Original poster: Thomas <tom-at-pwrcom-dot-com.au> > Original poster: "Luke" <Bluu-at-cox-dot-net> > Why is the rule of thumb them 1.6 > times c res for a static gap? > Luke Galyan > Bluu-at-cox-dot-net Here's how I justified my optimum capacitor size: http://www.users.bigpond-dot-net.au/broken.trout/Rotary_eqns.pdf Tom L.