OK.
I ran this test:
All Aircraft:
Set convergence to 275 for all guns.
Drive cross country and position as level as possible facing north by using a hill. Note, the tail wheel must not cross the ridge or the aircraft will simply roll down the other side. This prevented me from getting the aircraft to be completely level.
Set the target to 100 yards.
1a) Fire the cannon.
1b) Fire the machine guns, if any.
Set the target to 275 yards.
2a) Fire the cannon.
2b) Fire the machine guns, if any.
RESULTS:
Fw190D-9:
1a) Cannon rounds impact below the gunsight center, in two clusters level with eachother corrasponding to the cannons.
1b) Machine gun rounds impact on the crosshairs in one tight cluster.
2a) Cannon rounds impact on the crosshairs in a cluster that makes each cannon indistinquishable.
2b) Machinegun rounds impact on the crosshairs in a cluster.
N1K2-J:
1a) Cannon rounds impact below the gunsight center, in two clusters level with eachother corrasponding to the cannons.
1b) NA
2a) Cannon rounds impact on the crosshairs in a cluster that makes each cannon indistinquishable.
2b) NA
Mosquito Mk VI:
1a) Cannons impact below the pip in a tight cluster.
1b) Machine guns impact on the pip in a tight cluster.
2a) Cannons impact on the pip in a cluster.
2b) Machine guns impact on the pip in a cluster.
Spitfire Mk Vb:
UNABLE TO RUN TEST.
CONCLUSION:
At 100 yards the target is detecting the elevation of the gunsight from the cannons themselves. It is not detecting a drop in the rounds fired. The cannons are not spraying randomly, nor are there any appriciable differences between the MG151/20, Type 99 Model II or Hispano Mk II at 100 or 275 yards.
NOTE: I use historical gunsights.
Secondary findings:
The N1K2-J's landing gear are very weak and buckle easily.
The Mosquito Mk VI does not turn to the right using the rudder at low speed while on the ground.
The Spitfire Mk Vb is unstable for ground handling. The Spitfire Mk Vb's nose obstructs the forward view excessively making fine positioning difficult.
