Figure 61: Gun Funnel mode
In Gun Funnel mode, a graphic funnel is displayed on the HUD to indicate the calculated flight path
of cannon rounds. The distance between the sides of the funnel is based on the Target Size setting.
Target Size is an approximated value of the target’s wingspan. The Target Size value can be adjusted
using the [RAlt--], [RAlt-+] keys. The default Target Size value is 20 meters.
For effective fire using the funnel, maneuver the aircraft to place the funnel over the target so that
the target’s wingtips contact the sides of the funnel. If the Target Size is set accurately to correspond
to the target’s wingspan, you will have a good firing solution. Fire accuracy is greatest if the target’s
plain of motion is matched, e.g. if the target is turning with 30-degrees of bank, you should match
the turn with equal bank from behind the target. The gun funnel can only be employed from the rear
hemisphere.
Air-to-Ground Mode
The Su-27 can carry a limited variety of air-to-ground weapons. This includes unguided "iron" bombs
and rockets (RKT).
The GROUND mode [7] is used with these weapons. Air-to-ground aiming symbols are displayed in
the HUD. The mode name ОПТ ЗЕМЛЯ (VISUAL GROUND) appears in the lower left corner of the
HUD, and below it, the chosen weapon. The aiming principles are generally similar for all weapons –
it’s necessary to superpose the aiming pipper over the target, and drop or launch weapons when the
LA symbol indicates that the firing criteria have been met.
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