Can someone else check this? It may be my imagination.
Fly a Tempest straight and level. Adjust elevator trim so that the aircraft remains level with no stick input. Now, fire a number of very short bursts from the cannon.
Is the aircraft still trimmed, or do you need to retrim the elevators? It doesn’t seem to be a result of the recoil reducing the aircraft speed, because it only happens sometimes.
Or maybe it only happens to me :rolleyes:
I presume the only variable in this test is the cannon firing, you dont play with the rads or anything do you? I have noticed when at high speed and trimmed for level flight, if you whack the radiators into fully open it pulls the nose down, or perhaps thats my imagination too 
I’ll have a crack at the cannon thing today and let you know.
I suspect that opening the radiator fully would result in a forward movement of the centre of pressure. Interesting if that were actually modelled. I’ve heard (but never seen it confirmed) that it was ‘used’ as an air-brake but I’m not sure I really believe this
It would certainly need to be used with care - the usual requirement for an air brake is in a dive. A dive brake that pushes the nose down could be awkward.