Hi all
Jean -Bernard, sorry for joining late but better to turn up last than not turn up at all, what can I add to the comments written so far, probably nothing apart from to agree with all the praise that your work has already received.
In a vain attempt to sound clever and more as an effort to add some thing at this late stage I have some information that might be of help, particularly as it involves a form of this "French" gun and its use by the French during WWI in Aircraft, I joke not.
Hotchkiss Canon de 37mm modele 1885, weight 325 Ib, muzzle Velocity 2,850fs, recoil 1.5 tons, lenght of recoil 24in, shell weight 1.5 Lb
A picture of such a weapon (long barrel) mounted into a Voisin Ca4 "Le Rapace" of a French naval squadron at Dunkerque in 1916 can be seen on page 210 of "Early Aircraft Armament" by Harry Woodman, the same model weapon can also been seen mounted into a Voisin Ca5 on page 211.
Hotchkiss Canon de 37mm, modele 1902, Weight 103Lb, Muzzle velocity 1,200 fs, recoil 1.5 tons, lenght of recoil 5 in, shell weight 1lb.
The same book shows a short barreled version of the 1902 gun mounted in the nose of a Breguet 5.
At one point there were 59 37mm & 47mm armed aircraft on front line service, mostly ground attack.
These guns do however have recoil systems mounted over the top of the barrel.
Just to prove that if you give a pilot a big gun he will fly almost anything the French mounted a Hotchkiss 47mm in a flying boat that was powered by a 200Hp engine, too much Pernod (LOL)
If you think the pictures would be of help just drop me a line Jean-Bernard
PeteV