The Following is a translated description of the HKM Nimbus 4 by Prof. Dr. Stephan Lämmlein, a very highly regarded German model sailplane pilot and model airplane magazine columnist
Nimbus 4, The best of the best world class sailplane.
The goal of the legendary sailplane manufacturer, Shempp-Hirth was simple, to develop the best series built sailplane in the world. The result, Nimbus 4. A 26.4 meter dream with a L/D of well over 60. Many sailplane pilots are successfully achieving world class status with their Nimbus 4.
Now the demanding scale sailplane modeler can make this dream a reality. HKM Modellbau has reproduced the Nimbus 4 in Quarter scale and spared no expense. Not only is the model barely differentiated from the original, but the flight performance is unparalleled and can only be described as phenomenal!
The HKM Nimbus 4 is a true giant scale sailplane. It features a 6.6 meter wingspan with very high quality workmanship, so far unseen in the model market. How HKM achieved a total ready to fly weight under 10 kg borders on a miracle. The wing loading is lower than most 4 meter ships. The low sink rate of the model is even better than the original. There is no question regarding the thermalling ability of the Nimbus, simply unbeatable. Once specked out, set the six control surface wing into reflex, and watch as the Nimbus picks up speed and shines through with it's wind penetration ability and energy retention. Dynamic flight in new dimensions.
Like it's four piece wing bigger brother, the wing divides into pieces, none including the fuselage is longer than 2 meters. This way the sailplane lets itself store and transport easily and the practical side of modeling was thought of as well. Workmanship and attention to detail have to be seen to believe. HKM nimbus 4, a world class sailplane in perfection and performance.