From easy calculations based on Paschen's law (i.e. WIKI) 5.7mm is the optimal effective distance of our spark-plug electrodes to obtain best results having available just max 800V potential. This graph is for parallel electrodes separated by 2.5cm. Find on figure for air 1 torr=133.3Pa) expected lowest pressure during flight will be ~ 0.1 Torr so well in our range. Max (ground) pressure ~700 Torr so we can effectively operate from on almost whole range with optimal 5.7mm distanceand from ~10km up higher even with 2.5cm distant electrodes.
More interesting, dependences on temperature and humidity as well> http://home.earthlink.net/~jimlux/hv/paschen.htm
Vbreakdown = 24.22 * x + 6.08 * SQRT(x)
x = 293 * p * d / (760 * T)
p = pressure in Torr (mm Hg), d = distance in cm, T = Temperature in Kelvins, Vbreakdown in kV
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