Aileron-Rudder-Interconnect

[Avio]

I understand the rudders move when moving the ailerons due to the ARI feature. But shouldn't the rudders deflect to the left when ailerons are put in a left roll to counter adverse yaw to the right? At least that is what a GA plane does, though the F15 is certainly no GA :smilewink:

 

Avio

[GGTharos]

The ARI's purpose isn't to counter yaw; there's additional blending to deal with this. The purpose of the ARI is to let you command roll with the stick at high AoA (among other things), but rudder input should be able to override this as well AFAIK.

[SinusoidDelta]

The ARI is scheduled such that lateral stick travel with aft stick increases right rudder. Forward stick with lateral input increases left rudder. Here is the ARI scheduling. Note there are two schedules for both flaps up/down:

CAS can command up to +/- 15deg rudder deflection and the pedals can command +/-15 deg as well. The full 30deg can only be command with the ARI.

[Avio]

Thanks for the helpful info. That is one smart bird of a control logic that makes the F15 such sweet flying machine.

 

Avio

[mvsgas]

From the F-15 sim project.

http://www.f15sim.com/operation/f15_yaw_control.html