correct as-is No rudder input possible at low speed and high AOA - correct as is?

[idenwen]

After rewatching some basic flight maneuver videos i went to the Viper to refly them and it seems the fly by wire system prevents some of them - like the "falling leave" for example. In high AOA scenarios with slow airspeed (> 18-20° AOA & below 160 knots) the rudder input is just ignored. With raising speed and lower AOA control comes back partially and then full.

Is that a correct input override by the flight computer?

 

[Deano87]

Yes. The later block F-16s have good departure protection, including reducing rudder authority at high AoA.

What specific BFM videos were you referring to, and are they F-16 specific?

[idenwen]

1 hour ago, Deano87 said:

Yes. The later block F-16s have good departure protection, including reducing rudder authority at high AoA.

What specific BFM videos were you referring to, and are they F-16 specific?

Not F-16 specific and linked in the text above. Now embedded here too:

 

[LJQCN101]

Look for 'Rudder Authority Limiter' in your dash 1.

In NASA TP-1538, an assessment was made to examine how the additional rudder might affect the departure-resistance characteristics of the configuration. The result shows that a large amount of proverse sideslip was detrimental for two reasons:

1. It acted through dihedral effect to augment the roll rate, which in turn coupled with the higher yaw rate caused by the larger rudder deflection to substantially increase the nose-up inertia-coupling moment.
2. It kinematically coupled with the high roll rate to cause an increase in angle of attack. The result was a rapid pitch-out departure despite the application of full nose-down stabilator by the control system.

Edited January 12, 2022 by LJQCN101

[Wychmaster]

vor 8 Stunden schrieb idenwen:

Not F-16 specific and linked in the text above. Now embedded here too:

 

In the video he says that you should induce a stall. Doesn't the FCS in the F-16 prevent that from happening unless you do some really violent maneuvering?

[Snappy]

9 hours ago, idenwen said:

Not F-16 specific and linked in the text above. Now embedded here too:

 

Also I think you may factor in that jet aircraft are not always as well suited as props for certain aerobatics , for example a rudder reversal or hammerhead turn.

Prop aircraft usually have a heavy engine block in the front and at low or even zero forward airspeed the prop still generates airflow over the rudder control surface.

 

Edited January 12, 2022 by Snappy

[Deano87]

11 hours ago, idenwen said:

Not F-16 specific and linked in the text above. Now embedded here too:

 

That video is not at all relevant to flying and fighting in a modern jet. Least of all the F-16.

[idenwen]

49 minutes ago, Deano87 said:

That video is not at all relevant to flying and fighting in a modern jet. Least of all the F-16.

Was one of about 30 that day and just went through them one by one.

[Deano87]

1 minute ago, idenwen said:

Was one of about 30 that day and just went through them one by one.

Fair enough. His videos are good and the info about 1 circle vs 2 circle fights etc are quite good. As are his one about lead turns but some stuff that works in a WW2 warbird will just get you killed very quickly in a world with missiles.

[captain_dalan]

Did you try a hammerhead in a fly-by-wire jet? 

[Spurts]

I do hammerheads in the Harrier....

[Frederf]

Rudder authority decreases from 100% to 0% based on AOA (different CAT I/III). You can still do nose slices, just bunt forward to null your alpha first.

[Dragon1-1]

Yeah, the Viper's control system simply won't let you do crazy stuff like that, mostly because in the Viper, that's a good way to end up in a deep stall. In other aircraft, briefly stalling out can be a valid tactic, but in the Viper, most of the time you'll just end up stuck bobbing up and down as you plummet to earth. FCS will almost always keep you from getting to that point. 

In general, high alpha slow speed maneuvers isn't something that Viper does great, avoid getting there or the Russian in his MiG (or worse, the Navy puke in the Bug ) will just stand on his tail and nail you.