With a 120 sized engine you can get 8+ mins flights just like Tony says. Now if you leave it hammered the full flight you might be pushing your luck, but the KingCat is basicly a flying fuel tank. I have had just the two main tanks in all of mine ( I use the center section for a smoke tank) and set my timer at 8 min and usually land with about an inch in both tanks. That is with a Titan SE, but I rarely use full throttle. Scotty