Brian: I certainly can't answer your question, not having that experience "at altitude". But as I said, we( before the prop thing), had a weak cylinder, #4 which was pumping some oil, so we probably were developing 65 or so Hp at Max curve. I weigh 180, my partner around 200, and we,out of tall grass, and dense air did well. Certainly, we could have used more hp, with a top ROC of 400'/Min., but it was acceptable. These conditions may compare to yours (performance wise), but I'm sure more knowledgeable coupers on this forum can answer your question more precisely. Doug
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