Veers to the left on take off!? (Bug or Wind?)

[OnlyforDCS]

Hi can anyone help me out with this one? On take off the Mirage veers to the left from about 50knots and higher. I have to hit full right rudder to barely keep it on the runway.

 

As NWS is automatically disabled above 40knots I nearly crash before I get enough rudder authority to take off.

 

Im getting this behavior on both the NTTR Instant Take off mission, and Cold Start mission....

 

I didn't notice it doing that in 1.5. which is why I feel it might be a specific 2.0 bug. Is there significant crosswind dialed in on those two missions or is something off there?

[AJaromir]

Hi, this is doing because crosswind. Try to make own mission with no crosswind. BTW I think the force is strange high. It's very easy to take off or approach but for some reason in crosswind is damn difficult to stay straight on runway.

[nomdeplume]

Yeah, there's a few discussions about this - the effect of wind when you're on the ground seems excessive.

 

My first takeoff was in a test mission I made back when I was learning the MiG-21. It has a light wind which is no issue with either the Fishbed or the Warthog. In the Mirage, it wouldn't even taxi straight - it was manageable but it felt like I had something wrong with my controls.

 

On takeoff, I was veering wildly all over the runway trying to correct it. On a hunch, I disabled the winds entirely and the problem went away. Limiting the weather to 'an extremely mild breeze' seems to be necessary at the moment.

[OnlyforDCS]

Hi, this is doing because crosswind. Try to make own mission with no crosswind. BTW I think the force is strange high. It's very easy to take off or approach but for some reason in crosswind is damn difficult to stay straight on runway.

 

Thanks for the reply. Will try to make a simple mission in the editor without crosswind to see if there is any difference.

 

Will also try to disable NWS before take off roll, maybe this will slow the swerve initially. As for the significant force that could maybe be due to the pretty large vertical stabilizer on the M2000C.

[Bourrinopathe]

Also there's some fine tuning on the list.

 

I believe that we warned you that the aircraft is very susceptible to steering during take-off/landings rolls. We still haven't been able to fix that in the EFM, but it is in our list.

 

Just nudge the rudder, otherwise you will overcorrect and will end up going sideways or leaving the runway.

 

I'm also abnormally struggling with the T-O and Cold Start alignment (and my Mirage kung fu is obviously weak).

 

Will also try to disable NWS before take off roll, maybe this will slow the swerve initially. As for the significant force that could maybe be due to the pretty large vertical stabilizer on the M2000C.

 

I tried with the rudder control only, and it feels far less prone to bite the dust (but still tricky).

Edited December 28, 2015 by Bourrinopathe

[rrohde]

Agreed. Requires some smooth little rudder inputs in to get off the ground in NTTR in one piece; just as OnlyforDCS observed, this wasn't as extreme in 1.5...

[AJaromir]

I tried my new rudder pedals now. (MFG Crosswind) And it's much easier to hold it straight on runway. But still I am not sure if it's proper behaviour. I think the front wheel should lead the aircraft at takeoff but that is not doing.

[Jo Le Trembleur]

Same issue here : I made a mission with absolutely no wind, and the plane systematically deviates left at take-off, forcing to apply rudder right to stay aligned.

 

I first thought there could be an issue with my Saitek rudder, but I checked the neutral in its properties, and it seems OK.

 

Quite an odd behavior (?)

[Fishbed-21]

Yes same for me, is quite strange because it always veers to left. For the moment I start takeoff run with NWS off and full rudder right. If the plane start veering right I reduce rudder otherwise i hold full rudder to right until the plane take some speed and then I reduce.

[Jo Le Trembleur]

For the moment I start takeoff run with NWS off

 

Same thing. I may be wrong, but it seems to me it helps.

[Fishbed-21]

Same thing. I may be wrong, but it seems to me it helps.

 

From the manual:

3 Caution/Warning Lights panel All Off

4 NSW Secured

5 DIRAV Off

 

So it seems the correct procedure

[jcbak]

I am have similar issues and can't figure it out because it only happens intermittently. Last evening my buddy and I were flying the Mirage on 1.5.3. We both lined up on the runway. I always roll forward just to be sure my nose wheel is straight. I shut the NWS down....80% of the time there are no issues. Last night my buddy was flying lead.....we spoiled up to 80% and then went to mil power....his takeoff roll was fine. I began my roll with a dramatic yaw to the left....rudder control wasn't that effective and I had to use some differential braking to keep myself on the runway. Once airborne, everything was normal. Like I said, it doesn't always happen and its not the wind.

[Dino Might]

Pocket,

This forum and topic are specifically addressing the M2000C module, so your discussion of flight characteristics of the SU25T and TF51 may be better served in their respective forums.

 

As a short aside from this topic, Pocket, you will find that the SU25T should be much easier to control than the TF51 in terms of takeoff and landing. Make sure both engines are started and that you are applying equal thrust to both. As for the TF51, you will need to use rudder to counteract the engine torque that wants to veer the plane from centerline. Every time you change the throttle position, you are applying torque to the aircraft and will need to adjust with rudder.

 

For the M2000C, I have not noticed a problem with veering across the runway for quite a while now. One procedure I implemented was to make sure I let the nosewheel straighten out on the runway before I start throttling up to takeoff power. I still usually just leave nosewheel steering on and let it automatically turn off when at a high enough speed.

 

For all modules, check the wind settings on your missions. If you are having a lot of trouble veering off centerline, then make sure wind is set to 0 or a low value. Once you get the hang of it, start cranking up the wind velocity and get used to crabbing on takeoffs and landings. It's actually a ton of fun trying to land with a 10*+ offset from centerline and then straightening out once you touch down.