Akschu,
I was asking because I have a ringed Super Tigre .61 and I would be flying for 10 minutes and then she would go dead stick and I would bring her in. I always thought I was out of fuel. Well here I come to find out I still had half a tank of fuel.

She was on the rich side so it wasn't going lean. It sems that the engine was just getting too hot and shutting down. I have since changed fuel and have not had the problem since. I can get close to 20-25 minutes and when she comes in dead stick now it is because she is empty.