Is winter different than summer? I thought there was just less air conditioning required Just finishing an UltraSport 1000 with an OS FT-160 twin four-stroke. Before you throw me out of this thread, the first UltraSport 1000 I saw was at the Huntsville BPA event about two years ago. I thought it to be a pretty plane. I decided, however, to go fixed gear vs. retracts. My RC field is grass and the stronger gear and larger(3 1/2") wheels will do better.