As the other have said this is a problem common to Cubs caused by lifting off too early ..You need to let it build up more speed and let it lift itself off . Its not a bad idea to let somebody who is familiar with Cubs take it up for you the first time and get it trimmed out because they can be a real handful until you get used to them . They Are not a trainer although they will teach you a lot about flying . When taking off remember to use your rudder .