A couple of articles on my website which might be of interest. The first concerns the attempt during WW2 to improve the penetration of the Hurricane IID's 40mm Vickers Class S gun by fitting it with a Littlejohn squeezebore adaptor: http://www.quarry.nildram.co.uk/sgun.htm
The second is about the follow-up project with the 47mm Vickers Class P gun, which was test-flown by a Tempest fighter just after the war: http://www.quarry.nildram.co.uk/Pgun.htm
P.S. I should add that for further info on service WW2 airborne anti-tank guns, there's also this: http://www.quarry.nildram.co.uk/tankbusters.htm
The second is about the follow-up project with the 47mm Vickers Class P gun, which was test-flown by a Tempest fighter just after the war: http://www.quarry.nildram.co.uk/Pgun.htm
P.S. I should add that for further info on service WW2 airborne anti-tank guns, there's also this: http://www.quarry.nildram.co.uk/tankbusters.htm
