I just got my 1/7 scale Spitfire from World today. This plane looks excellent, and was packaged with great care. I just can't say enough about it. Now I'm deliberating what engine to put in it. I read a review on this plane a while back in Model Airplane News, I believe it was. A 70 4c is recommended for it, and they used an OS 70 in the article, but had to add 6 oz of weight to the nose. So I say why not make use of that extra weight and go bigger. I've been considering an OS 91, anybody have any thoughts or suggestions?