Hi, I am fitting the Eagle Tree Guardian 2d / 3d to my clipped wing cub, just read the manual on there web site, £56 from fast lad, after all the money and time building i want to give her and me the joy of staying in one lump, not in the black bag, and our field has a lot of cross wind, if it is as good as it clams, i will fit one to all the big wing models that i am looking to build, and when asked at sum of the shows , the big boys tell me they have them fitted for bad weather landings,but don't shout it out, best regards. brianlouis haddock.