Darth JBell

Ok. So it’s a developer thing which makes the aircraft move on the ground with nothing but rudder deflection. FSUIPC can’t change this. Got it. Yes. Let’s try this. Since we can’t change the model to act like real life, let’s trick it into thinking it’s off the ground at a particular airspeed (our best guess of when the rudder will become effective; 20knots/37 kph)… So only rudder usage above this speed and no differential braking. Below this speed, we’d have only differential braking and no rudder usage. We could tweak it if it’s too high/low later. I’ll ask Bear if they can update their model. Thanks a bunch! - Josh

Sir, I definitely think we're getting close. This last one is the best yet! We still want the rudder to move though. We just don't want it to perform a nosewheel steering sort of function on the ground. What if we change this portion of the script (or a different portion if I've got that wrong) to an airspeed value instead of having "onGround?" Could we maybe do something like 20 knots/37 kph? That way it could work with the funky braking requirements of the Chang on the ground but still be functional as a necessary control surface for takeoffs and landings. function calculateBrakeValues() -- First check if on ground - if not, we can ignore onGround = ipc.readUW(0x0366) if onGround == 0 then -- airborne return end What do you think? -Josh

No, sir. Still nothing new. The axis still acts like normal nosewheel steering. Yes, the differential braking works (I guess it always did), and the hand brakes work in concert when the pedals are neutral, but it still steers on the ground with just rudder pedal deflection when no hand brakes are applied. The plane would not do that in real life. I even added joy letters (naming the control stick C) to see if that helped. What are you thoughts? Somehow we must remove the nosewheel steering functionality. Were you able to get your Chang to work? - Josh P.S. Maybe I should've shared more of my purpose and background. I'm hoping to develop this model in order to help others learn ground ops on the real life Nanchang CJ-6. I'm not a programmer or a true Simmer; just a pilot hoping to learn new ways of teaching. I bought DCS just so I could get the Yak (it works great with no mods just as in real life), and I got P3D just for the Chang. I was disappointed with the model's functionality and set out to improve it with FSUIPC, but I may have gotten in over my head. I truly appreciate your help. If we can solve this mystery, we may be able to help all sorts of new Red Star pilot types learn how to taxi Migs, L-39s, L-29s, Yaks, Changs and other Eastern Bloc planes w/air systems.

Well, it's still not working. 😢 When it does run, it just acts like regular nosewheel steering. There seems to be no bias toward the brake handle needing to be actuated. In the .LUA script it references a letter (in addition to the assigned number) for the joystick to which the brake button is attached. Is that what I'm doing wrong? I only have the X56 HOTAS which shows up in my .INI as Joystick 2. It's Button 5 for the brake handle. Where would I find the "letter" to input. The Script says Letter "S." Thanks for looking into this mystery. I know it's strange, and I appreciate your time. -Josh P.S. Attached is what I've got in my .INI and .LUA FSUIPC6.ini nanchangBrake.lua

Ok, Sir! I’ll give it a shot. Thanks for your work on this! - Josh

Here are my joystick numbers Great, Sir! Thank you.

Sounds good, Sir!

Great, Sir! That’d be amazing! I have a brake “handle” on my X56 HOTAS. I’ll get the Joy Number and Button Number in just a sec.

Thanks for looking at this, Sir! It’s weird right? So in the real aircraft 3 things are going on: - First, when one moves the rudder bar, the rudder deflects a proportional amount just like any other aircraft as the two are connected via cable. - Second, when one grasps the “bicycle” brake handle, air from the pneumatic system is sent to both wheel brakes in equal amounts when the rudder bar is centered (not deflected more than 16 degrees either direction). - Finally, when one positions the rudder bar past neutral (anything greater than 16 degrees) with the brake handle also depressed, air from the pneumatic system is metered more toward the deflected side and less from the other side causing a differential braking condition for ground steering. Here is an example: if one wished to make a left turn onto the runway for takeoff, one would first put in left rudder bar deflection (something past 16 degrees of center), then apply a bit of pressure to the brake handle (maybe a couple of quick blips then release). More air going to the left brake will cause the plane to turn left on the ground. As soon as the plane starts turning, one would release the brake handle air pressure but probably keep the rudder bar deflected in case more turn was needed for the runway line up. After a couple more blips of hand braking with the rudder bar deflected, one will take out the rudder bar deflection and brake handle application to let the nose wheel straighten out for the line up (it’s free castering). After the nose wheel is straight one will then apply even braking (centered rudder bar) with the brake handle to come to a complete stop before engine run up for departure. All the while, the rudder deflected with each rudder bar movement a proportional amount independently of the level of brake handle application. So weird… Thanks again for looking. P.S. Yeah, that script in the INI file is just what populated when I tried to set up just the brake deflection with the Add-On menu in PREPAR3D. I definitely didn’t get it right. 😢

Thanks, Sandy! I’ll take a look although I’m running PREPAR3D w/FSUIPC version 6. The Behr Studio/Sim Market folks say the Chang doesn’t work w/MSFS 2020. 😢

Sir/Ma'am, My Googling skills have failed me. My search in the Forum and FAQs has yielded no fruit. My comprehension of the FSUIPC User Guide and the Guide for Advanced Users is quite limited. So... I must ask the community. Has anyone been able to set up the wheel brakes for the Nanchang CJ-6 in PREPAR3D? It's tricky bc one needs to actuate the brake handle (activating both brakes) and the deflect the rudder pedals (greater than 16 degrees left or right) to activate the differential steering used to control the aircraft movement on the ground. I am able to set the brakes up as an axis in the FSUIPC Add-On menu, but I can't decipher how to add the brake handle on the control stick as a "Condition" or "Combination" (in either the Add-On menu or INI file). Oh, and one still needs the rudder pedals to deflect the rudder as a primary flight control during flight conditions. It's the same type of setup anyone "flying" the Migs, L-39s or Yaks would need to accomplish, so maybe someone has done that? I'll take whatever help you have to offer. Thanks in advance! - Josh Here's what I currently have under Axes in my INI file (I think): PollInterval=10 RangeRepeatRate=10 0=0R,256,D,7,8,0,0 -{ DIRECT: LeftBrake, RightBrake }- 1=0R,BR,1152,16383,65720,0 -{ DIRECT: LeftBrake, RightBrakeEntering=BRAKES_LEFT }- 2=0R,BR,-15803,-1161,65721,0 -{ Entering=BRAKES_RIGHT }-