I agree , that world models is a nice plane and will be more realistic to warbird flight . The H9 planes are all very good flyers but they are so light they will not prepare you for a heavier warbird if that is your goal .---Not that heavier weight is ever a goal but most warbirds will be heavier then the 60 to 90 size H9 planes .

As far as magnums , they are very nice engine but I found that a drop of engine oil prior to every start really helps in the smooth operation .

Lastly , you can find some good deals on tower and E-bay on Os 4 strokes , I love the automatic priming of the os 4 strokes . Much better then the hand prlmer on the magnums .Its just another long stick sticking out the cowl [:'(]