My UCD did rolling harriers,a little sloppy but you could recognize it as a rolling harrier. I just ordered another one,been flying my Yak & Showtime but I still miss my UCD.I know I'm going to have to fix the weak areas, but I feel its worth it. At $159 with discount, an old but still running OS 108,have spare HS635's laying around, all i'll need is a receiver&some hinges,&push rods-cant go wrong for the money. I still have not seen any other plane(any size)any pilot, do very high alpha slow KE that the UCD do.I'm going to video it this time before its history.(I've seen other planes do HA KE but not as slow or as HA like the UCD.)Love my Yak,Showtime but the love affair is not over yet with UCD.