The new Lilienthal 31 is a joint development in conjunction with the DMFV (German Model Flyers Association) for youth work in model clubs and schools. The Lilienthal 30, which was produced by aero-naut, has now been revised with the aim of making it even quicker to build. The model no longer features a dethermaliser (DT) and auto-rudder, to ensure that construction is simple and rapid, but the instructions include information on upgrading the model with an auto-rudder.

The Lilienthal is of all-wood construction, and is covered in Japanese tissue. The wing features a flat-bottomed airfoil to eliminate any problems in construction. All the balsa, obechi and plywood parts are accurately laser-cut. The leading and trailing edges are machined to section and slotted to accept and support the ribs at the correct positions.

The kit is supplied with comprehensive building instructions including a stage drawing and plan.