The LT 40 comes in ARF and kits form I have built two of the ARF's in the last month one for myself and one for my uncle they are easy to build and fly great, their alittle larger than most 40 sized trainers which makes them easy to see. You can use any 40 sized engine, the two I spoke of have Saito-56's in them. You can't go wrong with an LT 40.