Ghengis, I am surprised at you. Have you been near a modern glider, on the ground I mean. "A small air generator" would probably produce more drag than the rest of the aircraft. I believe that a modern strobe could be driven by a battery for the eight hours required but an article about mid-airs in S&G a while back reckoned that they were not actually very effective.
Don`t forget to use your map. It will tell you where there are areas of intense Gliding activity and which sites launch gliders. If you avoid Gliding fields by a couple of miles, you will avoid MOST of the gliders.
Regards
Mike W