Hi John, I have 3 lt capacity between three tanks but plan on now using one of these for smoke as the SS will fly for about 8 1/2-9 min on 2 lt... Iam flying at very near full throttle for most of the flight with airspeed approx 120 mph and looking very scale, vertical is pretty good also and loop from level flight easily... I will have to get some flight video of it soon as it really amazes most when they here its flying on the little Wren