The tank that came with the kit is only 2 litres. I'm going to stick with 5 mins at the moment until I get a few more flights but I am looking at replacing the stock tank with a Dubro 100oz ( 3 L ) tank. I have a friend who flys a Jet Legend 1.8 Viper with a KT 100 and he carries 3.6 L and sets his timer for 8 1/2 mins. The 2 L tank is too small. I did get mine through D.A.