Yes it is the ARF. I think you will like the GS 40. I bought one, but returned it, I was going to put it in a FuntanaS. But I opted for an OS 61, then picked up the Avistar for a skills refresher, so then I exchanged the 61 for the 46 AX. The LA I dont like because its not rebuildable. But next the next engine I buy is going to be a Mecoah. I have an old KB 40 out in my building that had one tank of gas ran through 15 years ago. I might tear it down and see if its junk first, if it is, I'll just do the trade in. Good luck with your flight tomorrow. Hopefully about 2 more weeks and I'll have mine out and in the air.