Ice on the airway
We left the KBMG airport around 3:30 headed for home, KJGG. During our Lancair test drive an hour earlier we saw that the clouds were from about 8,000' to 10,000'. Our trip back was planned for 9,000 but we requested 11,000 right away, since we wanted to get "on top". We took off and pointed ourselves eastward, on the direct course we had been cleared for. Climbing out we felt a few bumps as we entered one or two clouds, but it was looking good that 11,000 would get us on top. It took a while to get cleared to that level, since we had to be handed off to Indy Center at 10,000'. By the time we were cleared to that height, we were entering some building clouds – their tops were starting to get into the 12,000' or higher range. We asked for 12,000' and were cleared for that, but soon we were entering a cloud with major updrafts in it. The ride was bumpy and maintaining altitude became a bit of a chore. Since the pilot needs to be using oxygen at 12,50