Did a search and the search feature doesn't seem to like short terms like OS or .10. But the few comments I have seen seem to indicate that the LA .10 is not a high revver but does turn a 8-3 with enough velocity to have more power than the Norvel .07 with its smaller props. But as I said "seem to indicate". I have an old old timer Model Craft Hornet free flight that I would like to convert to R/C. I have a Fox .15 but it is on another plane and may not be available. But I am thinking it is too big for this plane. It has a 48" wing span and most seem to power them with glow engines from .09 to .12 size. Don't know when I will get around to building it though.