junior, I am sure that you are overestimating the speed on the LT40! That large flat bottom wing produces a lot of drag which keeps the speed down. The LT0 is more of a 40 mph type plane which is one of the reasons that it makes such a great trainer. The Tiger2 has a symetrical wing and the fuselage is a more aerodynamic design. Its more of a 60 mph plane with a bushing engine and around 80 mph with a good engine such as an OS 46 AX. It will turn over a 11-6 prop at around 14.2 k!