Sarks757, The Robart 615 is designed for a plane that doesn't weigh more than 10 pounds. Most of the Hellcats come out heavier than that with a 120 up front. I had a set of these and found that the parts inside the retracts bend very easy. They are made of very thin sheet metal. Personally I think that it would be fine in a 40 size plane or a light 60 size plane. Maybe others have had better luck but I did not. As far as I know the only good retracts easily had are Sierra Precision or Century Jet. I having had both like the Sierra's no question. The struts that come with the Sierra's are a work of art and very scale looking. You can also purchase door mounts from him and he will have them installed for you so that you can attach the doors very easy. The Hellcat was designed for mechanical retracts so there are going to have to be mods done anyway. The Century Jet retacts have the least mods in fact hardly anything but a little dremel work. Read through this Forum from the beginning before you do anything and you will find that most of questions will be answered and most likely get some new ideas.

Randy