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Some of my planes pull left or right on braking when landing

G

guitar0633

Members +
I don't use rudder pedals and I just use one brake button to activate the entire brake system. But some of my okanes bpull hard right or left when hitting brakes on landing. Some don't. I was landing my TBM 850 Carenado last night and when I hit the brakes on landing it kept straight as an arrow, yet with the Carenado Caravan EX I hit the brakes on landing and the plane wants to pull hard one way or the other.

I notice a section in the brakes section of the plane cfg that says "Differential braking" and the 850 has a setting of 0.4 while the Caravan has 0.5.

If I am only using one brake button with no seperate toe brakes does this setting have any effect for me? I am tired of landing nice and straight and rolling straight until I hit my brakes and then it's swervy S path down the runway, but only with certain planes. I would love to put a stop to this but don't know what is causing it. Any help would e appreciated.
 
It's a parameter in FSX that's hard to tune sometimes because by default the Rudder and Differential Brake Axis is tied together. The way I dealt with the issue was to add more null zone in my rudder axis via the sim (not the hardware settings).
 
Try setting the differential brakes to 0. That way you don't activate the brake on the side you are are applying rudder.
The TBM is a low wing plane with a wide track main gear and a low CG, way easier to keep straight than the 208.

Another item you could experiment with is the nosewheel steering angle. On the TBM it's 30deg and on the 208 40deg.
Reduce it on the 208 to 30deg (or even less).
 
On the planes that swerve, do you have the rudder deflected when you hit the brake button? Like for example, if you use a joystick with a twist for rudder control, do you have the stick twisted when you hit the brakes? If you do, it's the same as hitting one of the two differential brakes buttons. Could that be why some planes swerve, because you're landing with some rudder deflection, and hitting the brakes with it still deflected? Other planes may not swerve because when you land them, there is no rudder deflection.
Just a thought...
Pat☺
 
Rudder 'Effect'

Pat I think you got it. He doesn't even have to have his hand on the joy for this to happen. There is some natural rudder 'effect' that develops after a few years. So increase of null for the rudder axis is a good idea but may not be the answer. Maybe it's just time for a new joystick. My joystick has some of that 'effect' but is not critical (yet).

But there are other 'factors' involved when it comes to brakes and differential braking. One is the braking strength in air file. Then there is the difference between braking and differential braking. Brakes s/b 1.000 and differential braking s/b 0.800. If they are 0.500 braking and 1.000 differential braking that is wrong. Then you have to allow for the model differences when it comes to gear type. Which then plunges you into the contact points and their placement (ie: accuracy of position to match model). No 2 models are alike when it comes to 'handling' and sometimes this is due to the above parameters being 'out of whack' for lack of a better word.

Of course, the aircraft mechanic's answer to this problem is: DON'T USE THE BRAKES ON LANDING! Ha!
Chuck B
Napamule
 
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