A shaft coupling with: (a) a drive shaft, (b) an output shaft and (c) a connecting device that connects the drive shaft to that output shaft such that it is torque-proof and comprises at least one transmission element that is made of a composite material, in particular a fibre composite, or metal, (d) the transmission element comprising (i) at least two tongues that are arranged at a tangent to the circle of rotation and (ii) each tongue being firmly attached to a bar at a tongue end; (iii) each tongue being periodically bent and twisted upon rotation of the drive shaft and the output shaft and upon the simultaneous occurrence of an axial and/or angular offset; (iv) and the bars being arranged such that they do not impede the deformation of the tongues, characterised by the fact that (e) each tongue comprises (i) a first connection point that is arranged at a distal end of the tongue, and (ii) a second connection point that is arranged at a transfer point between a tongue and bar, (iii) the first connection point and the second connection point being situated the same distance (d 26, d 28) from a rotational axis of the transmission element; (f) the bars are positioned radially outwards from a central area, (g) the bars having the same cross-section and a bar width and bar length, wherein the bar length is at least double the value of the bar width. (a) a drive shaft, (b) an output shaft and (c) a connecting device that connects the drive shaft to that output shaft such that it is torque-proof and comprises at least one transmission element that is made of a composite material, in particular a fibre composite, or metal, connects the drive shaft to that output shaft such that it is torque-proof and comprises at least one transmission element that is made of a composite material, in particular a fibre composite, or metal, that is made of a composite material, in particular a fibre composite, or metal, (d) the transmission element comprising (i) at least two tongues that are arranged at a tangent to the circle of rotation and (ii) each tongue being firmly attached to a bar at a tongue end; (iii) each tongue being periodically bent and twisted upon rotation of the drive shaft and the output shaft and upon the simultaneous occurrence of an axial and/or angular offset; (iv) and the bars being arranged such that they do not impede the deformation of the tongues, characterised by the fact that (i) at least two tongues that are arranged at a tangent to the circle of rotation and (ii) each tongue being firmly attached to a bar at a tongue end; (iii) each tongue being periodically bent and twisted upon rotation of the drive shaft and the output shaft and upon the simultaneous occurrence of an axial and/or angular offset; (iv) and the bars being arranged such that they do not impede the deformation of the tongues, (e) each tongue comprises (i) a first connection point that is arranged at a distal end of the tongue, and (ii) a second connection point that is arranged at a transfer point between a tongue and bar, (iii) the first connection point and the second connection point being situated the same distance (d 26, d 28) from a rotational axis of the transmission element; (i) a first connection point that is arranged at a distal end of the tongue, and (ii) a second connection point that is arranged at a transfer point between a tongue and bar, (iii) the first connection point and the second connection point being situated the same distance (d 26, d 28) from a rotational axis of the transmission element; (f) the bars are positioned radially outwards from a central area, (g) the bars having the same cross-section and a bar width and bar length, wherein the bar length is at least double the value of the bar width.