Control deflections

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boosted-lt1

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Unread post03 Oct 2005, 05:16

I was wondering if anyone has input on deflection of control surfaces.

Most important: Does the F-16 use stabilitor deflection in roll? If so how much?

How about total deflections of any other control surfaces?

Aileron with flap? leading edge devices, etc.

This is for the purpose of design for my personal X-plane use.

Thank you.

-Scott.
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Happy_Gilmore

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Unread post03 Oct 2005, 08:58

Lt and Rt Horizontal Stab's, 21 degree's up and down (21 degrees acft nose down in Manual Pitch Overide).
Rudder, 30 degree's Lt and Rt.
Flaperons, 21 degree's down, 23 degrees up.
Leading edge flaps, 2 degrees up to 25 degrees down.
Yes the Horizontal Stabs are used for roll control along with the Flaperons but the amount of deflection depends on pilot input, airspeed, FLCS gains and I'm sure a bunch of other stuff I don't know about.
Someone will chime in here and be more specific.
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FlightTestJim

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Unread post04 Oct 2005, 16:33

Keep in mind that the flight control gains (surface deflection levels) are also governed by the speed of the aircraft and during certain flight conditions (Class III stores, inflight refueling door open, gear extended, etc). These gains change to prevent too much movement of the control surfaces, which might cause damage or uncontrollability.
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lamoey

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Unread post04 Oct 2005, 17:03

Does the F-16 use stabilitor deflection in roll? If so how much?


Yes it does. Subsonic (R)66/(S)33, supersonic 50/S50, i.e. there is less horizontal movement subsonic.

There is also a slight deflection on the rudder when firing the gun

Leading Edge Flap goes to up to -2 degrees when supersonic.

Big difference in deflections whit gear down or not.

AOL big impact on all deflections
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boosted-lt1

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Unread post05 Oct 2005, 05:21

Good , thanks. These things help out a lot.

lamoey

(R)66/(S)33, supersonic 50/S50


Could you elaborate on this?

Would this question be better placed in the design/construction forum?

-Scott.
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lamoey

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Unread post05 Oct 2005, 12:55

It basically means that supersonic they share the same deflection, while subsonic the horizontal stabilizers have less deflection than the flaperons.
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Unread post07 Oct 2005, 03:05

Yo Ho!

The deflection angles are posted above.

When the surfaces reach those angles is up to Mister FLCS and the pilot's command. For example, I can put in 3 or 4 pounds of aileron pressure and the flaperons will move anywhere from full deflection to a degree and a half.

I used to have my studs look at the rudder as I did a slow speed roll using only aileron inputs (read "roll" for normal jets). Rudder would move almost to the limit, but I hadn't commanded a lick of yaw using the pedals.

Of course, the stabilators would gradually move leading-edge up at high AoA's. This was despite pulling back on the stick as hard as you could.

Good question, but relevant?

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boosted-lt1

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Unread post08 Oct 2005, 03:39

Moderator - Thanks for the move, I wanted this in the correct forum.

Really good info.

A couple of things:

Unfortunently, I don't believe I can mimic the F-16's flight control computer. On X-Plane, I don't use any artificial stability because it causes gameplay problems. I don't have the CPU to use art. stb. The plane flys well, but I am looking for realism ....of course.

How about speed brake delections?
Flap increment angle and max. flap angle?
Do ailerons droop exactly with the flaps up to max flap deflection?
Parachute diameter (area)?
Noes wheel steering angle?

Anyone know min. and max. weights of an F-16N?
I have minimum at 17,100 and max at 34K.

Thanks again....GREAT SITE! :D

-Scott.
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Happy_Gilmore

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Unread post08 Oct 2005, 09:56

Speed brakes are 120 degrees fully opened, each surface opens 30 degrees but that is with the gear in the wells, when gear goes down they auto close to 43 degrees, this is to keep the pilot from scraping them on the ground. However if the pilot holds the speed brake switch aft, it will over ride the 43 degree switch’s and they will fully open. Once nose gear is weight on wheels they can stay at the 120 degree range.
I don't remember how much the F-16N's weighed empty, but they were block 30's if that tells you anything, probably around 26k full of gas, never got close to 34k because the only weapon they carried was a captive AIM 9 and TACTS pod and no external tanks except a C/L on the TF (2 seater) models.
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saberrider

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Unread post10 Oct 2017, 06:55

lamoey wrote:
Does the F-16 use stabilitor deflection in roll? If so how much?


Yes it does. Subsonic (R)66/(S)33, supersonic 50/S50, i.e. there is less horizontal movement subsonic.

There is also a slight deflection on the rudder when firing the gun

Leading Edge Flap goes to up to -2 degrees when supersonic.

Big difference in deflections whit gear down or not.

AOL big impact on all deflections

"Big difference in deflections whit gear down or not "-more specific please .
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sprstdlyscottsmn

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Unread post10 Oct 2017, 12:53

Inputs are halved IIRC.
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saberrider

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Unread post10 Oct 2017, 18:33

sprstdlyscottsmn wrote:Inputs are halved IIRC.

Ok , but rate is changed in To/Landing configuration ? Like rudder or ailerons responses. Because is a contradiction in terms if you are in slow speed regimes you are draggier because of higher AoA to maintain the level ...but , slow down speed regimes require a full ranges deployment of the control surface's
for effectiveness versus higher speed and you talk about half of the range. This puzzled me.
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sprstdlyscottsmn

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Unread post10 Oct 2017, 19:39

The idea being that with the gear down you do not want full aft stick to give 2.0G, as an arbitrary example, so it gives 1.5G so you don't overshoot. Remember that the first flight was a result of overly "excited" controls during a high speed taxi test. This is not a low speed vs high speed thing, this is gear down vs gear up.
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saberrider

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Unread post11 Oct 2017, 04:58

Happy_Gilmore wrote:Lt and Rt Horizontal Stab's, 21 degree's up and down (21 degrees acft nose down in Manual Pitch Overide).
Rudder, 30 degree's Lt and Rt.
Flaperons, 21 degree's down, 23 degrees up.
Leading edge flaps, 2 degrees up to 25 degrees down.
Yes the Horizontal Stabs are used for roll control along with the Flaperons but the amount of deflection depends on pilot input, airspeed, FLCS gains and I'm sure a bunch of other stuff I don't know about.
Someone will chime in here and be more specific.

Why flaperons angle for up position is more than down position?

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