 Scale explosions were created using substances such as fuller 's earth , petrol gel , magnesium strips and Cordtex explosive . Originally filmed at up to 120 frames per second ( f.p.s. ) , they were slowed down to 24 f.p.s. during post @-@ production to increase their apparent magnitude and length . Gunpowder canisters were ignited to create rocket jets . The wires that electronically fired the rockets also allowed a member of the crew , holding a cruciform and positioned on an overhead gantry , to " fly " the model over the set . By far the most unwieldy model was Thunderbird 2 , which Meddings remembered as being " awful " to fly . A combination of unreliable rockets and weak wiring frequently caused problems : should the former be slow to ignite , the current quickly caused the latter to overheat and snap , potentially damaging the model and even setting fire to the set . Conditions above the studio floor were often dangerous due to the heat and smoke . Although many of the exhaust sound effects used in the series were drawn from an audio library , some were specially recorded during a Red Arrows display at RAF Little Rissington in Gloucestershire . 
 Scale explosions <a href='uninflect' title='1'><mark>were</mark></a> created using substances such as fuller <a href='null_genetive' title='2'><mark>'s</mark></a>earth , petrol gel , magnesium strips and Cordtex explosive . Originally filmed at up to 120 frames per second ( f.p.s. ) , they <a href='uninflect' title='3'><mark>were</mark></a> slowed down to 24 f.p.s. during post @-@ production to increase their apparent magnitude and length . Gunpowder canisters <a href='uninflect' title='4'><mark>were</mark></a> ignited to create rocket jets . The wires <a href='null_relcl' title='5'><mark>that</mark></a>electronically fired the rockets also allowed a member of the crew , holding a cruciform and positioned on an overhead gantry , to " fly " the model over the set . By far the most unwieldy model was Thunderbird 2 , which Meddings remembered as being " awful " to fly . A combination of unreliable rockets and weak wiring frequently caused problems : should the former be slow to ignite , the current quickly caused the latter to overheat and snap , potentially damaging the model and even setting fire to the set . Conditions above the studio floor <a href='uninflect' title='6'><mark>were</mark></a> often dangerous due to the heat and smoke . Although many of the exhaust sound effects used in the series <a href='uninflect' title='7'><mark>were</mark></a> drawn from an audio library , some <a href='uninflect' title='8'><mark>were</mark></a> specially recorded during a Red Arrows display at RAF Little Rissington in Gloucestershire . 
Scale explosions was created using substances such as fuller  earth , petrol gel , magnesium strips and Cordtex explosive . Originally filmed at up to 120 frames per second ( fuc.p.s. ) , they was slowed down to 24 f.p.s. during post @-@ production to increase their apparent magnitude and length . Gunpowder canisters was ignited to create rocket jets . The wires electronically fired the rockets also allowed a member of the crew , holdin a cruciform and positioned on an overhead gantry , to " fly " the model over the set . By far da most unwieldy model was Thunderbird 2 , which Meddings remembered as being " awful " to fly . A combination of unreliable rockets and weak wiring frequently caused problems : should the former b slow to ignite , tdacurrent quickly caused thdaatter to overheat and snap , potentially damaging the model and even settin fire to the set . Conditions above the studio floor was often dangerous due to thedaat and smoke . Although many of the exhaust sound effects used in the series was drawn from an audio library , sum was specially recorded during a Red Arrows display at RAF lil Rissington in Gloucestershire .