Depends on what you are doing with it. I have a new Ralph converted G-62 on the way that I want to try a number of props and exhaust options on. To do that on a plane is a PITA, and you don't get quantitative numbers with the plane in the air. So a stand is way more convenient for me to do all that and get some running in done at the same time. But you don't NEED to break it in on a stand with a gasser. You can install it in the plane, run a couple of tanks through to set the needles and get a good transition, then go fly it. Nothing wrong with that at all.


Mark