 An addition to the effects department was Mike Trim , who served as Meddings ' assistant in designing vehicles and buildings . Meddings and Trim jointly pioneered an " organic " design technique in which the exteriors of models and sets were customised with parts from model kits and children 's toys . Models and sets were also " dirtied down " with powder paint or pencil lead to create a used look . Toy cars and vans were used in long shot , while scale vehicles were equipped with basic steering and suspension for added realism . Miniature fans and Jetex pellets , which are capable of issuing air jets or chemical exhaust , were attached to the undersides to simulate dust trails . Another of Meddings ' inventions was a closed , cyclical effects stage nicknamed the " rolling road " : consisting of two or more loops of canvas running at different speeds , this device allowed shots of moving vehicles to be filmed on a static set to make more efficient use of the limited studio space . Airborne aircraft sequences were mounted against a " rolling sky " , with smoke fanned across to simulate passing clouds . 
 An addition to the effects department was Mike Trim , <a href='null_relcl' title='1'><mark>who</mark></a>served as Meddings <a href='null_genetive' title='2'><mark>'</mark></a>assistant in designing vehicles and buildings . Meddings and Trim jointly pioneered an " organic " design technique in which the exteriors of models and sets <a href='uninflect' title='3'><mark>were</mark></a> customised with parts from model kits and children <a href='null_genetive' title='4'><mark>'s</mark></a>toys . Models and sets <a href='uninflect' title='5'><mark>were</mark></a> also " dirtied down " with powder paint or pencil lead to create a used look . Toy cars and vans <a href='uninflect' title='6'><mark>were</mark></a> used in long shot , while scale vehicles <a href='uninflect' title='7'><mark>were</mark></a> equipped with basic steering and suspension for added realism . Miniature fans and Jetex pellets , which <a href='drop_aux' title='8'><mark>are</mark></a>capable of issuing air jets or chemical exhaust , <a href='uninflect' title='9'><mark>were</mark></a> attached to the undersides to simulate dust trails . Another of Meddings <a href='null_genetive' title='10'><mark>'</mark></a>inventions was a closed , cyclical effects stage nicknamed the " rolling road " : consisting of two or more loops of canvas running at different speeds , this device allowed shots of moving vehicles to be filmed on a static set to make more efficient use of the limited studio space . Airborne aircraft sequences <a href='uninflect' title='11'><mark>were</mark></a> mounted against a " rolling sky " , with smoke fanned across to simulate passing clouds . 
An addition to da effects department was Mike Trim , served as Meddings  assistant in designing vehicles and buildings . Meddings and Trim jointly pioneered an " organic " design technique in which the exteriors of models and sets was customised with parts from model kits and children  toys . Models and sets was also " dirtied down " with powder paint or pencil lead to create a used look . Toy cars and vans was used in long shot , while scale vehicles was equipped with basic steering and suspension for added realism . Miniature fans and Jetex pellets , which capable of issuing air jets or chemical exhaust , was attached to the undersides to simulate dust trails . Another of Meddings  inventions was a closed , cyclical effects stage nicknamed the " rollin road " : consisting of two or more loops of canvas runnin at different speeds , dis device allowed shots of movin vehicles to b filmed on a static set to make more efficient use of the limited studio space . Airborne aircraft sequences was mounted against a " rolling sky " , witt smoke fanned across to simulate passin clouds .