I am going to used the improved engine for this plane found here:
this submersible sprouted from my rich imagination as I was scribbling a few lines on a piece of paper in a lost moment at work
please note there are two versions on here. I dont know the dif between long and short but if you print 100% centered it cuts off the very tippy top of the two parts closest to the top. I suppose I will be using the short version