▁fus el age , ▁and ▁the ▁radi ator ▁was ▁located ▁beneath ▁the ▁fus el age . ▁The ▁X - 2 4 ▁cyl inder ▁configuration ▁of ▁the ▁V ulture ▁required ▁two ▁sets ▁of ▁e ject or ▁exhaust ▁stack s ▁on ▁each ▁side ▁of ▁the ▁cow ling , ▁and ▁that ▁the ▁engine ▁was ▁mounted ▁further ▁forward ▁than ▁the ▁Sab re ▁in ▁order ▁to ▁clear ▁the ▁front ▁wing ▁sp ar . ▁ ▁Fl ight ▁tri als ▁On ▁ 6 ▁October ▁ 1 9 3 9 , ▁the ▁first ▁prototype ▁( P 5 2 1 9 ) ▁was ▁flow n ▁by ▁P . G . ▁Lucas , ▁having ▁first ▁been ▁moved ▁from ▁King ston ▁to ▁Lang ley ▁for ▁completion . ▁Further ▁flight ▁tri als ▁revealed ▁air flow ▁problems ▁around ▁the ▁radi ator , ▁which ▁was ▁subsequently ▁re located ▁to ▁a ▁ch in ▁position . ▁Later ▁changes ▁included ▁increased ▁rud der ▁area , ▁and ▁the ▁upgrad ing ▁of ▁the ▁power plant ▁to ▁the ▁V ulture ▁Mark ▁V ▁engine . ▁Haw ker ▁production ▁lines ▁focused ▁on ▁the ▁H urr icane , ▁with ▁the ▁result ▁that ▁completion ▁of ▁the ▁second ▁prototype ▁( P 5 2 2 4 ) ▁was ▁significantly ▁delayed . ▁It ▁featured ▁the ▁ch in ▁radi ator , ▁additional ▁window ▁pan els ▁in ▁the ▁fair ing ▁behind ▁the ▁co ck pit , ▁and ▁the ▁ 1 2 ▁. 3 0 3   in ▁machine ▁guns ▁were ▁replaced ▁by ▁four ▁ 2 0   mm ▁His p ano ▁can non . ▁It ▁was ▁first ▁flow n ▁on ▁ 5