The AN-4S is an modificated Antononov 2, (please check out the regular AN-2 on my accout), which is used as an waterplane, but it can also start and land on land. Some of the features are the prop which is affected by the manuel propeller pitch controll, that means that the plane is possible to move bakewards, so make sure that you're able to control the prop pitch, if the prop is rotating to fast the whole plane will explode.. :D Also another feature which is not origanal, is the water break system to avoid a front flip while landing on the water, it can be used by activating stage 1 and pulling the pitch back. The best way to land is to use the negative prop pitch to slow down, than using the water/air breaks (see last sentence :D) and pull the plane up. // I hope I did not bored you to much, so have fun! Like usually made with love, feel free to improve though.