For a science project, I am in an event where I am supposed to make a plane with a wing span of 50cm, maximum wing chord of 7cm, maximum stabilizer span of 30cm, and maximum stabilizer chord of 4.5cm. It will be powered by a single propeller which is turned by a rubber band (which is winded before flight). The objective is to have it fly for the longest possible time (before any part of the plane touches the ground). Now, does anyone have any design recommendations?
So far, I was thinking of 787 style wings with raked wingtips, but I don't know if that will be so good for a plane going this slow.
Thanks in advance for the help.