Graupner DS 3781 - Digital High Speed Servo

Specifications

Source: Most data comes from the manufacturer but some data is sourced from our loyal community.

Last Updated:	2025-08-07
Modulation:	Digital
Torque:	4.8V: 26.00 oz-in (1.87 kg-cm)
Speed:	4.8V: 0.06 sec/60°
Weight:	0.99 oz (28.1 g)
Dimensions:	Length:0.91 in (23.1 mm) Width:0.59 in (15.0 mm) Height:1.06 in (26.9 mm)
Motor Type:	(add)
Gear Type:	Metal
Rotation/Support:	Dual Bearings
Rotational Range:	(add)
Pulse Cycle:	(add)
Pulse Width:	(add)
Connector Type:	(add)

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The discontinued Graupner DS 3781 is a specialized, ultra-thin digital "wing servo" from the high-performance DS line. It is meticulously designed for competition sailplanes and jets where aerodynamic efficiency is critical. Its key feature is its incredibly slim profile, which allows it to be installed completely within the structure of a thin, high-performance wing, creating zero parasitic drag. The DS 3781 combines this slim form factor with the precision, speed, and holding power of a digital controller, making it a top-tier choice for the ailerons and flaps of these demanding aircraft.
The identity of the DS 3781 is its perfect fusion of digital performance and aerodynamic elegance. For a top-level glider pilot, a clean airfoil is the key to victory. This servo provides the strong, precise, and reliable control needed for high-speed flight and precise camber adjustments, all while remaining completely hidden within the wing. It is a true instrument of the competitive soaring art.
For roboticists and custom designers, the Graupner DS 3781's slim profile and digital precision make it a unique and powerful tool. It is the perfect solution for any project that requires a precise actuator to be placed in a very narrow space. It could be used to create the articulated fingers of a high-fidelity robotic hand or for an actuation system within a streamlined, high-speed vehicle where both precision and a low profile are required.