I would try the 436 on 3S and run a minute and check the heat. Last night, i checked the Shark and Exceed models and the picture had 650 and in same caption, the size of 650 was 23" and thought what the H*** is going on as most models say 650 = 26" not 23".. BTW thanks for the private message. Thought you should know as were friends in private. Try the 436 on 3S and let me know, ok.