Interesting fact about the F-16 Side Stick Controller - ED Forums
 


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Old 07-11-2019, 07:58 PM   #1
Deano87
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Default Interesting fact about the F-16 Side Stick Controller

Hey all.

I'm sure I'm way late to the party on this but this is something I just stumbled upon while researching how/where I should mount my FSSB stick in preparation for the F-16, I didn't know about it so I thought I'd post it here just incase its new info for anybody else.

Apparently the force axises on the F-16 stick are rotated 12 degrees to the right. So to pull full up elevator with no roll input you actually have to pull the stick slightly towards you as well, this makes sense from an ergonomic point of view.

I found a thread about it on F-16.net with the attached picture and John Will (Structural flight test engineer for General Dynamics on the YF-16 and F-16 programs from 1973 until 1985) replied and confirmed that it is indeed correct. He also went on to say:

Quote:
Originally Posted by JohnWill @ F-16.net
The original YF-16 stick, in addition to being rigid, was aligned with the airplane axis system. It was found that pilots had a tendency to input some small roll command while trying to do a pure pitch pull up. Not sure when the change was made, but production airplanes have a stick with a small amount of motion in addition to the 12 degree rotated axis.

So, yes, if you pull straight back on the stick (airplane axis) you will get a small right roll command.
Really interesting!

I should point out that the Stick top itself is still aligned with the for/aft aircraft axis but its just the force sensors in the stick base that are rotated. Because Of this fact I'm going to mount my FSSB straight and then use the supplied software to rotate the output as thats possible.

Anyway, like I said I guess lots of people already knew this but I found interesting anyhow.



Here is the link to the F-16.net thread about it.
http://www.f-16.net/forum/viewtopic.php?f=23&t=24779
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Old 07-11-2019, 08:05 PM   #2
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Good to know for setting up the controls as realistic as possible. Good one.
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Old 07-11-2019, 08:59 PM   #3
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Man, this reminds me of going to Magic Edge in the '90s, they had full motion simulator cockpits based off the F-16 (including force-sensing side sticks) despite the game putting you in a Hornet.

https://www.system16.com/hardware.php?id=832
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Old 07-11-2019, 10:01 PM   #4
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Good find! If I convert my setup to a side-stick one, I'll rotate it like that.
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Old 07-11-2019, 10:49 PM   #5
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Here's another interesting fact. A side stick could be considered a liability in combat. When the Israelis were designing the Lavi, they decided to go with a center stick so that the pilot could still control the aircraft even with a damaged right arm... Sure, the odds are pretty low, but in certain instances a center stick could make the difference between an injured pilot getting the aircraft home or not.
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Old 07-12-2019, 01:17 AM   #6
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The stick barely moves at all. It's just a big pressure switch.
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Old 07-12-2019, 01:39 AM   #7
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It might not move much but it still requires 25lb of force to demand full pitch command and 17lb in roll, so there’s still a bit of force there. Although the people that I know personally who’ve flown the F-16 mainly complain about neck problems related to the seat recline angle more than anything else, nice problem to have I suppose lol.
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Old 07-12-2019, 03:23 AM   #8
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Quote:
Originally Posted by Deano87 View Post
It might not move much but it still requires 25lb of force to demand full pitch command and 17lb in roll, so there’s still a bit of force there. Although the people that I know personally who’ve flown the F-16 mainly complain about neck problems related to the seat recline angle more than anything else, nice problem to have I suppose lol.
Although the F-16 is my favourite airplane and I've got many books etc. about heir, I didn't know about sidestick axis or the neck problems.
Very interesting info, thanx
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Old 07-12-2019, 04:00 AM   #9
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Quote:
Originally Posted by Deano87 View Post
It might not move much but it still requires 25lb of force to demand full pitch command and 17lb in roll, so there’s still a bit of force there. Although the people that I know personally who’ve flown the F-16 mainly complain about neck problems related to the seat recline angle more than anything else, nice problem to have I suppose lol.
I don't think it's the seat position they're primarily talking about. At least in our case and a few of my buddies in other units, it's the HMIT system for the helmet that's causing the neck issues because the helmet isn't weighted correctly. There's a lot of squadrons that are transitioning to a new system to correct that.

Having messed with the stick during flight control ops checks and rigs more than my fair share, I can confirm on Block 30's that it takes a good amount of force on the stick to get full deflection from a control surface. Block 40's and up aren't quite the same since everything was upgraded to newer shit. Haven't personally messed with any directly, but I've got a few former Block 40 guys working with me from other units that talk about how much better/easier they are to work on vs Block 30's.
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Old 07-12-2019, 05:30 AM   #10
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Cheers - I actually came accross exactly the same info this week as I look for the best way to mount my FSSB R3 also. Is what also made my mind up about purchasing the angle adapter as well.
Interesting you mention the actual stick itself is still aligned fore/aft, just the sensors are 12 deg off. I will check with Manuel at Realsim before final design of the mount to ensure it can be setup like that, else I can also just have mounting holes rotated 12 deg.

I am pretty sure it does have the capability to adjust the rotation thou - from the webpage:

Rotation Adjust
Again hearing our customers, R3 Lighting includes a rotation adjust, in this way, you can rotate physically the R3 hardware in the table or in your desk support, and after that adjust the rotation angle, the R3 lighting will translate all the forces to correct values


EDIT: Just checked the manual - and yes there is an Angle Adjust feature.
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Last edited by VampireNZ; 07-12-2019 at 05:48 AM.
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