I checked yesterday for the gear (when I replied) and they were in stock. Just search on the part number and it will pull right up.

The o.s. 50 has similar power as my ys 63. Use a 12x8 prop for pattern stuff and a 13x4w or 13x6 for 3D. It should handle it.

I would not worry about 30% nitro just yet. Try the different props out first.