Abstract: A holding device for a tablet computer has a lower part spanning a setting-up surface for setting it up on a tabletop and an upper part which can be rotated with respect to the lower part about a rotation axis extending substantially perpendicularly to the setting-up surface, which upper part has a first and a second bearing surface for the tablet computer, wherein each of the bearing surfaces defines a position of the tablet computer in which it is inclined at an acute angle to the setting-up surface, and wherein the tablet computer in the position defined by the first bearing surface is inclined at a greater angle to the setting-up surface than in the position defined by the second bearing surface.

Abstract: A holding device for a tablet computer has a lower part spanning a setting-up surface for setting it up on a tabletop and an upper part which can be rotated with respect to the lower part about a rotation axis extending substantially perpendicularly to the setting-up surface, which upper part has a first and a second bearing surface for the tablet computer, wherein each of the bearing surfaces defines a position of the tablet computer in which it is inclined at an acute angle to the setting-up surface, and wherein the tablet computer in the position defined by the first bearing surface is inclined at a greater angle to the setting-up surface than in the position defined by the second bearing surface.

Abstract: A control device for use in unmanned model aircraft for a constant speed propeller is disclosed. The device comprises a propulsion engine coupled to the propeller. The rotational speed of the propulsion engine is regulated through an automatic change of the angle of attack of the propeller and a manual or automatic adjustment of the throttle. It also comprises an electric servomotor device, a power transmission and a controller. The servomotor device is positively coupled to the propeller via the power transmission. The controller controls the servomotor device. The variable angle of attack of the propeller is adjusted by the power transmission from the servomotor device and the propulsion engine, manually by an operator or automatically by the controller.