As basic as everything else seems, that yaw system with bellows driving cranks seems way more sophisticated - you'd think electric motor control at the time would have been good enough to provide a simpler yaw drive (keeping the bellows for the pitch/roll). But it's really cool to watch, has a very steampunk look to it.,(reply>), @Wolfgang Faust You beat me to it! Link is considered a legend among those of us who collect player pianos and other mechanical musical instruments. He was also responsible for a number of innovations in deep-sea diving.,(reply>)," The designer's experience was from his father working on pipe organs (about <a href=""https://www.youtube.com/watch?v=RJAYZgOZS08&amp;t=1m20s"">1:20</a> in the video).  His skill set was mechanical so that's how he built it.  If the design works don't change it - particularly as those capable of improving it were needed for other military developments.",(reply>), Since Link was experienced with pipe organs and pneumatics, this may just be a case of "do what you know will work"---that mechanism looks very similar to the sort of pneumatic motor a player piano uses to advance and rewind the roll.