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The older YS engines can't get through a pattern with .9 pounds of fuel? I find that hard to believe. And what is harder about weighing the models for one round in the finals before they take-off then weighing them after they land? They go from the scales to the ready box. Simple. Right now there are two problems with weighing after the flight. A glow guy gets to empty his tanks. Unless someone watches them do that, what's to say they don't do something like pull other equipment out of the plane, like a regulator or a battery? With an electric model, especially in the Finals, you need to get the battery on charge ASAP. The delay in the weight check after the flight can be a real problem, especially if you only have one or two "contest" packs. I guess I just don't understand the difference.