 During the designing and filming process , Meddings ' first priorities were realism and credibility . With the exception of Thunderbird 5 , each vehicle was built in three or four scales . Meddings ' swing @-@ wing concept for Thunderbird 1 was inspired by his wish to create something " more dynamic " than a fixed @-@ wing aircraft . He remained unsatisfied with the prototype of Thunderbird 2 until he inverted the wings , later commenting , " ... at the time , all aircraft had swept @-@ back wings . I only did it to be different . " This decision was made out of personal preference and was not informed by any expert knowledge on Meddings ' part . He described the Thunderbird 2 launch as " probably the most memorable " sequence that his team devised for an APF production . 
 During the designing and filming process , Meddings <a href='null_genetive' title='1'><mark>'</mark></a>first priorities <a href='uninflect' title='2'><mark>were</mark></a> realism and credibility . With the exception of Thunderbird 5 , each vehicle was built in three or four scales . Meddings <a href='null_genetive' title='3'><mark>'</mark></a>swing @-@ wing concept for Thunderbird 1 was inspired by his wish to create something " more dynamic " than a fixed @-@ wing aircraft . He remained unsatisfied with the prototype of Thunderbird 2 until he inverted the wings , later commenting , " ... at the time , all aircraft <a href='been_done' title='4'><mark>had</mark></a> swept @-@ back wings . I only did it to be different . " This decision was made out of personal preference and was not informed by any expert knowledge on Meddings <a href='null_genetive' title='5'><mark>'</mark></a>part . He described the Thunderbird 2 launch as " probably the most memorable " sequence <a href='null_relcl' title='6'><mark>that</mark></a>his team devised for an APF production . 
During da designing and filming process , Meddings  first priorities was realism and credibility . w the exception of Thunderbird 5 , each vehicle was built in three or four scales . Meddings  swing @-@ wing concept for Thunderbird 1 was inspired by his wish to create something " more dynamic " than a fixed @-@ wing aircraft . He remained unsatisfied with tdaprototype of Thunderbird 2 until he inverted thdaings , later commenting , " ... at the time , all aircraft done swept @-@ back wings . I only did it to b different . " This decision was made outt of personal preference and was not informed by any expert knowledge on Meddings  part . He described thedaunderbird 2 launch as " deff the most memorable " sequence his team devised fa an APF production .