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Author Topic: Differential breaking (Resolved)  (Read 633 times)

Online jackpilot

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Differential breaking (Resolved)
« on: March 06, 2018, 09:09:58 AM »
I use PFC rudder pedals.
https://flypfc.com/shop/rudder-pedals/cirrus-rudder-pedals-boeing-style/

Assignments and calibration FSUIPC (curve at 13) all OK
Even if I try to apply carefully the same pressure on both sides, I have a hard time breaking and keeping the aircraft on a straight line, which makes taxiing and docking a real challenge.

Need your comments and experience on that
Jack
« Last Edit: March 07, 2018, 04:24:39 PM by jackpilot »


Jack

Offline Bob Reed

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Re: Differential breaking
« Reply #1 on: March 06, 2018, 09:55:09 AM »
When I get the sim fired up today I will take a look at my settings. I am using CH pedals and as I recall I am not using any curve. I have to be carful when applying brakes but I have no issues while taxing or parking and once the Auto brakes have slowed me down to 80knts it is pretty easy to keep her going straight....

Offline navymustang

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Re: Differential breaking
« Reply #2 on: March 06, 2018, 10:18:51 AM »
Would like input on this from folks - on small aircraft differential breaking is required to assist in steering, but with a steerable nose wheel, how often does a real 737 pilot use breaks to steer rather than the tiller? After all, I think you get something like 73 degrees of nose wheel on the ground at low speed.

I actually have my breaks tied together without differential available, even though my hardware could support it if desired.

Thanks
Building a full scale 737-800 AATD for home use. Majority of hardware is from Sismo Solutions, software is Prosim under P3D. An AOPA member and LifeTime member of National Association of Flight Instructors
Please note that I am a self-employed professional cockpit builder that provides consulting to defense contractors and civilian schools and airlines.

Online jackpilot

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Re: Differential breaking
« Reply #3 on: March 06, 2018, 10:42:03 AM »
I thought of that and I agree ...how do you assign each  pedal axix though, to keep proportional (not differential) breaking ? 8)


Jack

Offline KyleH

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Re: Differential breaking
« Reply #4 on: March 06, 2018, 12:28:50 PM »
Would like input on this from folks - on small aircraft differential breaking is required to assist in steering, but with a steerable nose wheel, how often does a real 737 pilot use breaks to steer rather than the tiller? After all, I think you get something like 73 degrees of nose wheel on the ground at low speed.

I actually have my breaks tied together without differential available, even though my hardware could support it if desired.

Thanks

I'm pretty sure I've seen a statement in a 767 manual to not use differential braking to steer. Not sure about the 737 with a single axis main gear.

Offline FredK

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Re: Differential breaking
« Reply #5 on: March 06, 2018, 12:47:52 PM »
I find differential breaking (along with differential thrust) useful for making tight taxi turns, for example a u-turn at the end of a runway.  Not sure if that is SOP for the 737 though.

Regarding Jack’s issue.....I find I have more issues with rudder steering on landing than with the differential brakes.  No issues at slow taxi speed to speak of.

Using linear slope calibration for brakes.  I am also using linear calibration for my rudders but have set the calibration limits to +/- 32000 in the FSUIPC to effectively cut the rudder sensitivity in half.  Perhaps that is something to play with for brakes in Jack’s case.

Fred K
« Last Edit: March 06, 2018, 12:56:36 PM by FredK »
Boeing 737NG-800, Prepar3D v4.1, Sim-Avionics, WideView multi-channel (curved screen), Optoma 1080GTDarbee projectors (3), Fly Elise warping, FSGRW weather, FDS OH panels and CDUs, SimParts MIP, FDS SysBoards (OH), CPFlight MCPPro and pedestal panels, FI Gauges, PFC controls, converted motorized TQ (SIOC), Weber seats

Offline navymustang

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Re: Differential breaking
« Reply #6 on: March 06, 2018, 02:07:55 PM »
One of the aspects I take when flying my sim is to replicate actual procedures as much as possible. So the use of differential breaks seems to be off limits. So why bother hooking them up?
Building a full scale 737-800 AATD for home use. Majority of hardware is from Sismo Solutions, software is Prosim under P3D. An AOPA member and LifeTime member of National Association of Flight Instructors
Please note that I am a self-employed professional cockpit builder that provides consulting to defense contractors and civilian schools and airlines.

Online jackpilot

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Re: Differential breaking
« Reply #7 on: March 06, 2018, 02:44:56 PM »
One of the aspects I take when flying my sim is to replicate actual procedures as much as possible. So the use of differential breaks seems to be off limits. So why bother hooking them up?
So as said above, how do you link them?


Jack

Offline KyleH

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Re: Differential breaking
« Reply #8 on: March 06, 2018, 02:56:36 PM »
Use the FSX brakes axis rather than the individual axes.

Online jackpilot

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Re: Differential breaking
« Reply #9 on: March 06, 2018, 03:37:01 PM »
I use P3D and all P3D assignments are disabled (to avoid random double assignments)
Ill try assigning both left and right to the same axis on FSUIPC.
« Last Edit: March 06, 2018, 04:42:22 PM by jackpilot »


Jack

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Re: Differential breaking
« Reply #10 on: March 07, 2018, 03:09:22 PM »
Done, works like a charm
FSUIPC5 and P3d
Axis tab
move left brake pedal
tick first line and assign "left brake"
tick second line and assign "right brake"

Rescan

Same for right brake


Jack

 

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