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A chain‐drive transmission is made in two separate portions mounted one on each of two separable components, such as a detachable or folding wing structure, or a removable engine installation, and so arranged that the drive is automatically broken when the components are separated and re‐engaged when they are re‐assembled. As shown applied to a detachable wing 10 which is secured to the body 11 of the machine by the engagement of pins 14, 15 in hooks 12, 13, the aileron and flap controls consist of chain‐and‐sprocket circuits 16, 17 and 18, 19 on the wing and body respectively, normally slack portions 23 of the chains 20 of circuits 18, 19 being engaged by sprockets 27, integral with the sprockets 25 of circuits 16, 17, when the wing is attached to the body. If desired a change of gear ratio may be introduced by making the sprockets 25, 27 of different sizes.