Zoid ... and the computer on board only had the computing power of one of those give away calculators.... In it's time that was one powerful computer....... and most of the computing was done in a human head then feed into the puter...... ok I am a NASA Geek .... I have the copies of the Boeing blue prints of the Saturn V and The Soviet N1-l3 lunar launch vehicle.... It was so much more seat of the pants flying back then