Taxiing

[Dannyvandelft]

Bought the Tomcat yesterday, is it supposed to taxi like I'm dragging the Nimitz behind me? I disengage the parking brake and it just won't roll normally.

 

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[Scotch75]

Yeah, she's a pretty heavy bird when fully loaded so it takes a bit of thrust to overcome the initial rolling friction (sorry, I can't think of the proper engineering/scientific name: inertia maybe?). Just check your brakes axes aren't the wrong way around ie braking when you are not pressing toe brakes, you may need to invert them if you have are using pedals with toe brakes.

 

Cheers!

 

 

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[r4y30n]

Needing extra thrust to unstick the plane from a standstill is a DCS-wide issue, as far as I know. I’ve seen it in every jet module I own.

[Dannyvandelft]

Yeah, she's a pretty heavy bird when fully loaded so it takes a bit of thrust to overcome the initial rolling friction (sorry, I can't think of the proper engineering/scientific name: inertia maybe?). Just check your brakes axes aren't the wrong way around ie braking when you are not pressing toe brakes, you may need to invert them if you have are using pedals with toe brakes.

 

Cheers!

 

 

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Funny you mentioned that. I was just looking down into the cockpit as I was taxiing and I just happened to notice that when I use my toe brakes, they don't release when I come off them. So I set my wheel brakes to the joystick pinky lever, and sure enough, they released all the way, and the Cat rolls like it should.

 

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[Scotch75]

Funny you mentioned that. I was just looking down into the cockpit as I was taxiing and I just happened to notice that when I use my toe brakes, they don't release when I come off them. So I set my wheel brakes to the joystick pinky lever, and sure enough, they released all the way, and the Cat rolls like it should.

 

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Yeah, it's a bit of a quirk when installing/reinstalling modules, the brake axes seem to be default to on.

 

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[Shadow_1stVFW]

initial rolling friction (sorry, I can't think of the proper engineering/scientific name: inertia maybe?).

 

That there is called: Sticktion

 

It's a HIGHLY technical term /s

[Emmy]

Needing extra thrust to unstick the plane from a standstill is a DCS-wide issue, as far as I know. I’ve seen it in every jet module I own.

 

No such issue with the Viper.

[r4y30n]

That's good news, hopefully it will trickle down to the others in the future.

[IronMike]

That's good news, hopefully it will trickle down to the others in the future.

 

 

It probably won't. The problem is the friction, if it was lower the aircraft would start gliding around quite literally, overshoot runways and so on. It's a trade-off in most any sims when it comes to ground behavior and how aircraft "stick" to the ground. In the Viper's case I assume it is small or light enough to mitigate the initial roll stick-effect.

 

IRL one of our SMEs told us that it would be in fact enough to bring just 1 throttle out of idle a notch and the aircraft would start rolling. If we'd adjusted it to that, however, the result would be as described above, the aircraft would not have enough friction.

[lucky-hendrix]

does it have to be a constant factor ? I can't be a function of speed ? DCS limitation ?

[Dannyvandelft]

It wasn't any of that. The toe brakes were "stuck on" after release. Now that I've changed the settings on my pedals she rolls just like she should. Smooth as butter.

 

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[draconus]

does it have to be a constant factor ? I can't be a function of speed ? DCS limitation ?

devs and their problems, better don't ask

[IronMike]

devs and their problems, better don't ask

 

It's a limitation in almost any sim. Unfortunately I haven't seen convincing ground behavior anywhere yet.

 

Think about where ground behavior is well done: Racing sims. And a huge effort has to go into for example laser scanning tracks (runways), taxiways in our case, and developing the entire physics around that, suspension etc etc... In a flight sim the ground is the part we spend least time on of course, so it makes sense that not the same effort is put into ground physics like in a racing sim. I could imagine the F1 flight model ain't too great either hehe.

 

I do hope this will change in the future though, as I find taxiing (and I mean it aint horrible though) and rolling and touching down and so forth a lot of fun, and an integral part, too.

Edited November 5, 2019 by IronMike

[ataribaby]

We had opposite problem in BMS. Fully loaded Viper starts rolling even on idle. So yes it is problem in every flight sim. Our FM magician just made same compromise and added bit of friction just enough to stop this behavior.