Minimum convergence?

[TomcatViP]

Storm, I think you are mixing convergence indication on the gunsight and guns convergence.

There is no way you can set your guns to converge as so short distance as 50 m. Try to remind that flying a fighter plane during BoB was not a sport that you will practice in a selfish manner. You had orders, directives and technical operatives procedures that order could be achieved following the directives (otherwise there is no planned tactics hence no strategies).

By the way, those indication are in the maintenance manuals, not in the pilot manual. I think I alrdy saw one passing by on this forum

You also made an error IMHO:
Distance of convergence = L*cosinus
Distance of gun from main axis = L*sinus

tan= sin/cos and Tan^-1=angle of EACH GUN

Offset of gun at the gun's breech : d_gun*sinus (d is the length of the buried part of the gun)
In the case of 50m conv for 2m it give us 8cm offset (1m long gun - machine-gun).

For a plane with four gun in each wing, it means that you'll have to keep 32cm of available free space without taking into account any structural spacer.

Also : Size of prop = 3.6 for 109 if I do remind well
etc...