I flew an Eaglet for over 6 years and taught many youngsters how to fly (stick to the low wing, he he) on it. I wore out four sets of elevator and wing servos. A failed elevator servo eventually led to the demise of my beloved Eaglet 50. I used several engines on the bird and found that the OS 32 could be squeezed into the nose, tight but do-able. I got the best performance on the Eaglet with the 32 using a gray 9x6 prop. It landed like a feather, was slow and docile like a trainer, but was highly aerobatic with the extra power. Many years ago Model Airplane News ran an article on converting the eaglet 50 to a Screaming Eagle. If I recall it consisted mostly of changing the airfoil by slightly flattening the wing ribs. Good luck with your Eaglet 50! Take your time and it will last you many years