I dont recall the engine you are using. But on my funtana with a SAITO 100 which is probably about the heaviest engine that you would want to put on there it only took a half ounce of weight (two little blocks) on the right wingtip, with the engine mounted sideways. If you are using a four stroke engine and you dont want to add that little bit of weight, then you can mount it upside down, which also looks better in my opinion. It veers away from that uneven look. If you are however using a two stroke, you will probably be better off mounting it as illustrated in the manual. In my experiences, two strokes tend to load up very easily when mounted inverted. Plus most any two stroke that would be used on the plane would be short and therefore the weight of the engine or muffler wouldnt have as much leverage as one with a taller head height. good luck.