Hi, sorry to dissapoint you but I only flew my Sportster twin one time. I found it to be a very heavy for it's size basically a lead sled that was not fun to try and fly! It was hard to get enough speed to get it off the ground. Once it was flying, the high wing loading was evident. It was fast but hard to control. I was using 2 Fx32 motors. I pulled them when I got home to put into other projects. Imho, the wing is simply too small to carry the extra load of a second engine, narcelle, fuel tank and extra servo. I did make another twin from plans using 2 FX46 engines. The build took a long time to put together. It is also heavy but has a huge wing and control serfaces to handle the extra weight of two engines. It is amazing to fly! 😁 Hope this helps. Cheers!!