1 for the back fire and 2 for wing guns .Story:I saw a lot of futuristic planes on web ,such as schwalbe ll so i decided to make a plane like one of those future planes.1.started drawing a simple design which was aerodynimic 2 made the same design on the game 3 after 30min of work finally it matched the design i made4 added wings which took me 23mi n to get in the perfect place ......part // NOW the problem after putting engines ,instead of flying it would flip loop without stopping.2 try to figure out the problemfor 4 hours!! afterwards i thought to change my design. I wasted three pages of my sketch book after wards when i was I came up with the second photo design which you sould check out.this design were just lines. for trying to make a better model .these lines after earesing the i came with this design not exactly same but idid try.when i made it ,it did look goofd .so her it ids.