Wow!!!! This is good info. I have been a zombie for the past two days, after completing the Compensator. Even though I have not measured it, I can tell you that it is definitely the forty size version. In fact, the fellow that gave me the plane flew the yellow one yesterday, with an LA 46. I have a NIB 40 sf abc, and 46 sf abc, and will use one of them. So, is this plane indeed legal for SPA?