not only that but it helps offset the lateral balance of the motor as long as there is a half tank or so. A 10 min flight is about all I can get out of my irvine 53 with an 8 oz tank, but I have a higher preformance muffler and fly it pretty aggressively. By the way I finally got the saito 72 tuned properly and with a graupner 12.5 x 5 it finally feels like a powerful motor. revving it up to about 10,500. sounds just like a ys 63.