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when aircraft starts takeoff run it starts veering to the side. What can cause this and whats the fix ?

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Make sure that landing gear values are the same on both sides. Someone once sent me a model that had that very same issue, and that was the problem.

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Make sure that landing gear values are the same on both sides. Someone once sent me a model that had that very same issue, and that was the problem.

[TailGear]

SystemType=LANDING_GEAR

Retractable=FALSE

DeployTime=4.0

DragArea=0.25

AnimationID=-1

HideGearNode=FALSE

ModelNodeName=TStrut

ShockAnimationID=

ShockNodeName=TailShock

ShockTravelAxis=Z-AXIS

ShockStroke=0.11

SpringFactor=3.0

DampingFactor=2.0

WheelNodeName=ttire

RotationAxis=X-AXIS

RollingRadius=0.800

ReverseModelOrientation=FALSE

CastoringWheel=TRUE

CastoringNodeName=TailShock

Steerable=TRUE

MaxSteeringSpeed=41.15

InputName=YAW_CONTROL

ReverseInput=TRUE

Locking=TRUE

MaxSteeringAngle=-35.0

ControlRate=1.0

HasBrakes=FALSE

RollingCoefficient=0.05

MaxLoadFactor=3.0

MaxDeploySpeed=115.75

 

[LeftMainGear]

SystemType=LANDING_GEAR

Retractable=TRUE

DeployTime=6.0

DragArea=0.50

AnimationID=1

HideGearNode=FALSE

ModelNodeName=Gear_L

ShockAnimationID=

ShockNodeName=

ShockTravelAxis=Z-AXIS

ShockStroke=0.11

SpringFactor=3.0

DampingFactor=2.0

WheelNodeName=Tire_L

RotationAxis=X-AXIS

ReverseModelOrientation=FALSE

RollingRadius=0.70

CastoringWheel=FALSE

HasBrakes=TRUE

BrakingCoefficient=0.75

RollingCoefficient=0.05

MaxDeploySpeed=115.75

 

[RightMainGear]

SystemType=LANDING_GEAR

Retractable=TRUE

DeployTime=6.0

DragArea=0.50

AnimationID=1

HideGearNode=FALSE

ModelNodeName=Gear_R

ShockAnimationID=

ShockNodeName=

ShockTravelAxis=Z-AXIS

ShockStroke=0.11

SpringFactor=3.0

DampingFactor=2.0

WheelNodeName=Tire_R

RotationAxis=X-AXIS

ReverseModelOrientation=FALSE

RollingRadius=0.70

CastoringWheel=FALSE

HasBrakes=TRUE

BrakingCoefficient=0.75

RollingCoefficient=0.05

MaxDeploySpeed=115.75

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Is it all a/c? If so, it might be the joystick needs centering.

If it's only one a/c, maybe the a/c.

Hope that helps.

just this one

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Then it's probably what Fubar512 suggested.

 

Which a/c, and terrain?

I could try the same a/c, if I have it installed, and see if I get the same issue.

Just an idea.

Edited by TurtleHawk

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[TailGear]

MaxSteeringAngle=-35.0

 

Should be MaxSteeringAngle=35.0

 

Try that.

Raven

Edited by RAVEN

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[TailGear]

MaxSteeringAngle=-35.0

 

Should be MaxSteeringAngle=35.0

 

Try that.

Raven

changed it,,,still same problem :dntknw:

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Ed, is this model twin engined, or twin-tailed, by chance?

 

its the Hampden

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its the Hampden

 

Ah, then....the plot thickens! Check both vert stabs, make sure that they mirror one another, and ditto for the engine values.

 

Regarding the latter, critical areas are prop efficiency, power levels, throtte rates, moments of inertia (all must be equal or mirrored), and prop torque...since this is a twin-engine ac, it stands to reason that the props are opposed in rotation...that may be your problem.

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Ah, then....the plot thickens! Check both vert stabs, make sure that they mirror one another, and ditto for the engine values.

 

Regarding the latter, critical areas are prop efficiency, power levels, throtte rates, moments of inertia (all must be equal or mirrored), and prop torque...since this is a twin-engine ac, it stands to reason that the props are opposed in rotation...that may be your problem.

 

[LeftStab]

ParentComponentName=Fuselage

ModelNodeName=Stab_L

ShowFromCockpit=TRUE

DetachWhenDestroyed=TRUE

DamageRating=DISABLED

MassFraction=0.02

HasAeroCoefficients=TRUE

LiftSurface=TRUE

CL0=-0.0033

CLa= 0.1119

CD0= 0.0004

Cmq=-2.2826

Cmad=-1.1280

Cyb=-0.0128

Clp=-0.0028

Cnb= 0.0162

CL0MachTableNumData=3

CL0MachTableDeltaX=0.40

CL0MachTableStartX=0.00

CL0MachTableData=1.195,1.000,0.128

CLaMachTableNumData=3

CLaMachTableDeltaX=0.40

CLaMachTableStartX=0.00

CLaMachTableData=1.004,1.000,0.927

CD0MachTableNumData=3

CD0MachTableDeltaX=0.40

CD0MachTableStartX=0.00

CD0MachTableData=1.830,1.000,1.032

CmqMachTableNumData=3

CmqMachTableDeltaX=0.40

CmqMachTableStartX=0.00

CmqMachTableData=0.960,1.000,1.173

ClpAlphaTableNumData=15

ClpAlphaTableDeltaX=4.00

ClpAlphaTableStartX=-28.00

ClpAlphaTableData=1.735,1.551,1.394,1.263,1.158,1.079,1.027,1.000,1.000,1.026,1.078,1.156,1.260,1.391,1.547

XacMachTableNumData=3

XacMachTableDeltaX=0.40

XacMachTableStartX=0.00

XacMachTableData=-9.386,-9.380,-9.355

Ymac=-1.79

StructuralFactor=4.5

MinExtentPosition=-0.2,-8.0,1.00

MaxExtentPosition=-2.3,-9.0,1.20

CollisionPoint[001]=-0.2,-8.0,1.00

CollisionPoint[002]=-2.3,-9.0,1.00

HasVortexEmitter=FALSE

SystemName[001]=LeftElevator

 

[RightStab]

ParentComponentName=Fuselage

ModelNodeName=Stab_R

ShowFromCockpit=TRUE

DetachWhenDestroyed=TRUE

DamageRating=DISABLED

MassFraction=0.02

HasAeroCoefficients=TRUE

LiftSurface=TRUE

CL0=-0.0033

CLa= 0.1119

CD0= 0.0004

Cmq=-2.2826

Cmad=-1.1280

Cyb=-0.0128

Clp=-0.0028

Cnb= 0.0162

CL0MachTableNumData=3

CL0MachTableDeltaX=0.40

CL0MachTableStartX=0.00

CL0MachTableData=1.195,1.000,0.128

CLaMachTableNumData=3

CLaMachTableDeltaX=0.40

CLaMachTableStartX=0.00

CLaMachTableData=1.004,1.000,0.927

CD0MachTableNumData=3

CD0MachTableDeltaX=0.40

CD0MachTableStartX=0.00

CD0MachTableData=1.830,1.000,1.032

CmqMachTableNumData=3

CmqMachTableDeltaX=0.40

CmqMachTableStartX=0.00

CmqMachTableData=0.960,1.000,1.173

ClpAlphaTableNumData=15

ClpAlphaTableDeltaX=4.00

ClpAlphaTableStartX=-28.00

ClpAlphaTableData=1.735,1.551,1.394,1.263,1.158,1.079,1.027,1.000,1.000,1.026,1.078,1.156,1.260,1.391,1.547

XacMachTableNumData=3

XacMachTableDeltaX=0.40

XacMachTableStartX=0.00

XacMachTableData=-9.386,-9.380,-9.355

Ymac=1.79

StructuralFactor=4.5

MinExtentPosition=-0.2,-8.0,1.00

MaxExtentPosition=-2.3,-9.0,1.20

CollisionPoint[001]=-0.2,-8.0,1.00

CollisionPoint[002]=-2.3,-9.0,1.00

HasVortexEmitter=FALSE

SystemName[001]=RightElevator

 

[Engine1]

SystemType=PROP_ENGINE

InputName=THROTTLE_CONTROL

EngineID=1

SLPowerDry=1223513.2

ThrustAngles=0.0,0.0,0.0

ThrustPosition=-2.813,3.769,0.00

ThrottleRate=0.5

AltitudeTableNumData=8

AltitudeTableDeltaX=1524

AltitudeTableStartX=0.0

AltitudeTableData=1.000,0.965,0.835,0.765,0.645,0.465,0.200,0.000

SpinnerNodeName=Spinner_L

StaticPropNodeName=Prop_L

SlowPropNodeName=SlowProp1

FastPropNodeName=FastProp1

SlowPropRPM=200

FastPropRPM=625

MaxPropRPM=750

IdlePropRPM=150

BSFC=0.010

ExhaustEmitterName=DirtyExhaustEmitter

ExhaustPosition=-3.419,2.491,-0.8

FireSuppression=TRUE

StructuralFactor=4.5

MinExtentPosition=-3.0,3.0,-0.40

MaxExtentPosition=-2.4,1.50,0.40

PropRotationDirection=LEFT

ReversePropOrientation=TRUE

ConstantSpeed=TRUE

NumBlades=3

PropDiameter=3.88

PropEfficiencyAdvanceRatioTableNumData=11

PropEfficiencyAdvanceRatioTableDeltaX=0.2

PropEfficiencyAdvanceRatioTableStartX=0.0

PropEfficiencyAdvanceRatioTableData=0.023,0.40,0.70,0.80,0.86,0.87,0.87,0.87,0.87,0.86,0.85

MomentOfInertia=0.05

MinManifoldPressure=0.35

MaxManifoldPressure=1.0

 

[Engine2]

SystemType=PROP_ENGINE

InputName=THROTTLE_CONTROL

EngineID=2

SLPowerDry=1223513.2

ThrustAngles=0.0,0.0,0.0

ThrustPosition=2.813,3.769,0.00

ThrottleRate=0.5

AltitudeTableNumData=8

AltitudeTableDeltaX=1524

AltitudeTableStartX=0.0

AltitudeTableData=1.000,0.965,0.835,0.765,0.645,0.465,0.200,0.000

SpinnerNodeName=Spinner_R

StaticPropNodeName=Prop_R

SlowPropNodeName=SlowProp2

FastPropNodeName=FastProp2

SlowPropRPM=200

FastPropRPM=625

MaxPropRPM=750

IdlePropRPM=150

BSFC=0.010

ExhaustEmitterName=DirtyExhaustEmitter

ExhaustPosition=2.172,2.491,-0.8

FireSuppression=TRUE

StructuralFactor=4.5

MinExtentPosition=3.0,3.0,-0.40

MaxExtentPosition=2.4,1.50,0.40

PropRotationDirection=LEFT

ReversePropOrientation=TRUE

ConstantSpeed=TRUE

NumBlades=3

PropDiameter=3.88

PropEfficiencyAdvanceRatioTableNumData=11

PropEfficiencyAdvanceRatioTableDeltaX=0.2

PropEfficiencyAdvanceRatioTableStartX=0.0

PropEfficiencyAdvanceRatioTableData=0.023,0.40,0.70,0.80,0.86,0.87,0.87,0.87,0.87,0.86,0.85

MomentOfInertia=0.05

MinManifoldPressure=0.35

MaxManifoldPressure=1.0

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I said the vert stabs, as in vertical, not the horizontal stabs....

 

First, use ThrustPosition=0.0,0.0,0.0 on both engines, for trouble shooting purposes. Next, while I believe that "PropRotationDirection" is mostly cosmetic, why do you have them both set to left?

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I said the vert stabs, as in vertical, not the horizontal stabs....

 

First, use ThrustPosition=0.0,0.0,0.0 on both engines, for trouble shooting purposes. Next, while I believe that "PropRotationDirection" is mostly cosmetic, why do you have them both set to left?

 

 

 

[leftVertTail]

ParentComponentName=Fuselage

ModelNodeName=VerTAIL_L

ShowFromCockpit=TRUE

DetachWhenDestroyed=TRUE

DamageRating=DISABLED

MassFraction=0.06

HasAeroCoefficients=TRUE

CD0= 0.0005

Cyb=-0.1846

Cyp= 0.0173

Cyr= 0.2740

Clb=-0.0028

Clp=-0.0012

Clr=-0.0026

Cnb= 0.0720

Cnp=-0.0033

Cnr=-0.2791

CD0MachTableNumData=4

CD0MachTableDeltaX=0.30

CD0MachTableStartX=0.00

CD0MachTableData=1.857,1.000,1.010,4.564

ClbAlphaTableNumData=15

ClbAlphaTableDeltaX=4.00

ClbAlphaTableStartX=-28.00

ClbAlphaTableData=-8.840,-7.700,-6.522,-5.313,-4.078,-2.823,-1.554,-0.278,1.000,2.273,3.535,4.779,6.001,7.193,8.350

ClpAlphaTableNumData=15

ClpAlphaTableDeltaX=4.00

ClpAlphaTableStartX=-28.00

ClpAlphaTableData=59.238,44.729,31.878,20.939,12.129,5.623,1.552,0.000,1.000,4.537,10.546,18.915,29.484,42.052,56.377

ClrAlphaTableNumData=15

ClrAlphaTableDeltaX=4.00

ClrAlphaTableStartX=-28.00

ClrAlphaTableData=-7.753,-6.996,-6.104,-5.092,-3.982,-2.793,-1.551,-0.278,1.000,2.259,3.473,4.620,5.678,6.624,7.442

CnbAlphaTableNumData=15

CnbAlphaTableDeltaX=4.00

CnbAlphaTableStartX=-28.00

CnbAlphaTableData=0.877,0.909,0.936,0.958,0.976,0.990,0.998,1.001,1.000,0.994,0.983,0.967,0.946,0.921,0.891

CnpAlphaTableNumData=15

CnpAlphaTableDeltaX=4.00

CnpAlphaTableStartX=-28.00

CnpAlphaTableData=-5.877,-5.278,-4.574,-3.777,-2.904,-1.971,-0.997,0.000,1.000,1.984,2.932,3.826,4.649,5.385,6.018

CnrAlphaTableNumData=15

CnrAlphaTableDeltaX=4.00

CnrAlphaTableStartX=-28.00

CnrAlphaTableData=0.140,0.150,0.159,0.167,0.690,1.066,1.260,1.270,1.000,0.546,0.176,0.170,0.163,0.154,0.145

StructuralFactor=4.5

MinExtentPosition=-0.07,-6.0,1.3

MaxExtentPosition= 0.07,-9.0,2.8

CollisionPoint[001]=0.00,-6.0,1.00

CollisionPoint[002]=0.00,-8.75,2.8

HasVortexEmitter=FALSE

SystemName[001]=RudderL

SystemName[002]=TailLight

 

[RightVertTail]

ParentComponentName=Fuselage

ModelNodeName=VerTAIL_R

ShowFromCockpit=TRUE

DetachWhenDestroyed=TRUE

DamageRating=DISABLED

MassFraction=0.06

HasAeroCoefficients=TRUE

CD0= 0.0005

Cyb=-0.1846

Cyp= 0.0173

Cyr= 0.2740

Clb=-0.0028

Clp=-0.0012

Clr=-0.0026

Cnb= 0.0720

Cnp=-0.0033

Cnr=-0.2791

CD0MachTableNumData=4

CD0MachTableDeltaX=0.30

CD0MachTableStartX=0.00

CD0MachTableData=1.857,1.000,1.010,4.564

ClbAlphaTableNumData=15

ClbAlphaTableDeltaX=4.00

ClbAlphaTableStartX=-28.00

ClbAlphaTableData=-8.840,-7.700,-6.522,-5.313,-4.078,-2.823,-1.554,-0.278,1.000,2.273,3.535,4.779,6.001,7.193,8.350

ClpAlphaTableNumData=15

ClpAlphaTableDeltaX=4.00

ClpAlphaTableStartX=-28.00

ClpAlphaTableData=59.238,44.729,31.878,20.939,12.129,5.623,1.552,0.000,1.000,4.537,10.546,18.915,29.484,42.052,56.377

ClrAlphaTableNumData=15

ClrAlphaTableDeltaX=4.00

ClrAlphaTableStartX=-28.00

ClrAlphaTableData=-7.753,-6.996,-6.104,-5.092,-3.982,-2.793,-1.551,-0.278,1.000,2.259,3.473,4.620,5.678,6.624,7.442

CnbAlphaTableNumData=15

CnbAlphaTableDeltaX=4.00

CnbAlphaTableStartX=-28.00

CnbAlphaTableData=0.877,0.909,0.936,0.958,0.976,0.990,0.998,1.001,1.000,0.994,0.983,0.967,0.946,0.921,0.891

CnpAlphaTableNumData=15

CnpAlphaTableDeltaX=4.00

CnpAlphaTableStartX=-28.00

CnpAlphaTableData=-5.877,-5.278,-4.574,-3.777,-2.904,-1.971,-0.997,0.000,1.000,1.984,2.932,3.826,4.649,5.385,6.018

CnrAlphaTableNumData=15

CnrAlphaTableDeltaX=4.00

CnrAlphaTableStartX=-28.00

CnrAlphaTableData=0.140,0.150,0.159,0.167,0.690,1.066,1.260,1.270,1.000,0.546,0.176,0.170,0.163,0.154,0.145

StructuralFactor=4.5

MinExtentPosition=-0.07,-6.0,1.3

MaxExtentPosition= 0.07,-9.0,2.8

CollisionPoint[001]=0.00,-6.0,1.00

CollisionPoint[002]=0.00,-8.75,2.8

HasVortexEmitter=FALSE

SystemName[001]=RudderR

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Well, the aerodynamic values seem to be in order, but the min-max extents are duplicated, instead of offset left & right. That shouldn't have any bearing on flight characteristics, but the way they're currently setup, damage to the "right" vert tail will effect the left vert tail.

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Well, the aerodynamic values seem to be in order, but the min-max extents are duplicated, instead of offset left & right. That shouldn't have any bearing on flight characteristics, but the way they're currently setup, damage to the "right" vert tail will effect the left vert tail.

 

if you would like I can send the folder to you

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this is the only issue preventing me from releasing it :this::fool:

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this is the only issue preventing me from releasing it :this::fool:

 

PM it to me, and I'll have a look at it.

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