One of the more interesting experiments undertaken to extend the range of the early jets in order to give fighter protection to the piston engined bombers, was the provision for in-flight attachment/detachment of fighter to bomber via wingtip connections. One of the several programs during these experiments was MX106 done with a B-29 mother ship and two F-84D "children", and was code named "Tip Tow" A number of flights were undertaken, with several successful cycles of attachment and detachment, using, first one, and then two F-84s. The pilots of the F-84s maintained manual control when attached, with roll axis maintained by elevator movement rather than aileron movement. Engines on the F-84s were shut down in order to save fuel during the "tow" by the mother ship, and in-flight engine restarts were successfully accomplished.