I've currently got 9 planes in flying configuration. It's about all I can keep organized at one time. I never take more than 3 to the field, but which 3 depends on the weather, so I keep them all fully equipped. Besides, I refuse to add nose or tail weight to my planes if humanly possible, so I'll have batteries and receivers crammed in where the whole installation must be removed to get at them, so they stay until the plane is taken out of service. Swap meets and auctions keep the cost resonable, and I'll save up for large volume purchases of servos and such at the Toledo show. You get some better deals on Sunday...