This question is a bit late in my game participation and because I've just had one of those DouH moments in the MA.
The historic gunsites from each country were attempting to address the issues of convergance, bullet drop, lead distance, rate of fire, and effective range of projectile by the engineers and pilots of the time.
I used the ravi gunsite on a 190D9 last night with the cannons set to 350d. When I zoomed the site in I noticed the bottom bar stopped short of center. At 350d rasing the nose to center on the top notch of the bottom line caused my cannon rounds to be very effective. I then took another look at german sites and noticed the same theme. Is the bottom vertical line stopping short of center an accounting for the known drop of german cannon rounds at around 350d?
Can anyone give a short rationel for the other historical sites?
I notice the diameter of the german sites is a bit smaller. Ive been using the ravi on everything lately and Im hitting more often because Im making smaller deflections with the smaller circle.