Spitfire power

[Kiwi_Bro]

Gday
Just got up to where you fly the spitfire in the campaign and for some reason I cant get much power out of it. When the AI flies it , the Spit hums along but when I take over the power reduces and pressing W for emergency power doesn't work nor does adjusting the throttle on my joy.

Is there a separate throttle for it ?? (by the way I fly it on easy mode ).

Thanks in advance.