The ornamental design for a radiocontrolledairplane, as shown and described.
FIG. 1 is a bottom plan view of a radio controlled airplane, showing my design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a bottom-right-front perspective view thereof;
FIG. 6 is a top-right-rear perspective view thereof;
FIG. 7 is an enlarged partial view of the nose portion of FIG. 1; and,
FIG. 8 is an enlarged partial view of the nose portion of FIG. 2.
The structural features depicted by broken lines have been shown for the purpose of illustrating portions of the radio controlled airplane that form no part of the claimed design.