aircraft not take off ???

[Woodylepic]

have some trouble whit my aircraft.cfg
im at the end of the edition of  my aircraft.cfg  hall go very well except 2 thing  :(
1 dont know why but i have to set up the reference datum 7 feet at front of the 1/4 wing  oterwise mi c.o.g and my gear position is not aligned whit the phisical gear and the wing of the plane and the plane is not flyable !
2 the plane dont whant to take off i have to slew up my plane for take off
whene airborn the plane fly well (i have learn from the cfs2004 sdk
i can't land or take off (on the ground the plane move a very very litle bit at full rpm) the plane seem like glued !
brake or parking is not aply
dont know if the cose is the propeler ?he have fixed pitch at 19 degree  pls help !

[Woodylepic]

here the aircraft.cfg data
[WEIGHT_AND_BALANCE]
max_gross_weight=11089                         // (pounds)
empty_weight=4199                            // (pounds)
reference_datum_position=7.24, 0.0, 0.1         // (feet) distance from FlightSim Reference position: (1/4 chord, centerline, waterline)
empty_weight_CG_position=-1.2, 0, 0       // (feet) longitudinal, lateral, vertical distance from specified datum

[GeneralEngineData]
engine_type=0                                 //0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop
Engine.0=2.70, 0.0, 0.0                        //(feet) longitudinal, lateral, vertical distance from reference datum
fuel_flow_scalar=0.932                          //Fuel flow scalar
min_throttle_limit=0.0                       //Minimum percent throttle.  Generally negative for turbine reverser
master_ignition_switch=1
[piston_engine]
power_scalar=1.0                              //Piston power scalar
cylinder_displacement=127                   //Cubic inches per cylinder
compression_ratio=6.0                       //Compression ratio
number_of_cylinders=12                       //Number of cylinders
number_of_magnetos=2                                                   / /Number of magnetos on the piston engine. Only values of 1 and 2 are supported.
max_rated_rpm=2300                             //Max rated RPM
max_rated_hp=480                               //Max rated HP
fuel_metering_type=1                           //0=Fuel Injected, 1=Gravity Carburetor, 2=Aerobatic Carburetor
cooling_type=1                                 //0=Cooling type Air, 1=Cooling type Liquid
normalized_starter_torque=0.3                  //Starter torque factor
turbocharged=0                                 //Is it turbocharged? 0=FALSE, 1=TRUE
max_design_mp=0                              //Max design manifold pressure, (inHg)
min_design_mp=0                              //Min design manifold pressure, (inHg)
critical_altitude=0                         //Altitude to which the turbocharger will provide max design manifold pressure (feet)
emergency_boost_type=0                         //0=None, 1=Water Injection, 2=Methanol/Water injection, 3=War Emergency Power
emergency_boost_mp_offset=0                    //Additional manifold pressure supplied by emergency boost
emergency_boost_gain_offset=0                  //Multiplier on manifold pressure due to emergency boost
fuel_air_auto_mixture=1                        //Automixture available? 0=FALSE, 1=TRUE
auto_ignition=0                                //Auto-Ignition available? 0=FALSE, 1=TRUE
max_rpm_mechanical_efficiency_scalar=1.0       //Scalar on maximum RPM mechanical efficiency
idle_rpm_mechanical_efficiency_scalar=1.0      //Scalar on idle RPM mechanical efficiency
max_rpm_friction_scalar=1.0                    //Scalar on maximum RPM friction
idle_rpm_friction_scalar=1.0                   //Scalar on idle RPM friction
[propeller]
thrust_scalar=1.0                              //Propeller thrust scalar
propeller_type=0                             //0=Constant Speed, 1=Fixed Pitch
propeller_diameter=12.0                         //Propeller Diameter, (feet)
propeller_blades=2                             //Number of propeller blades
propeller_moi=22.000                           //Propeller moment of inertia
beta_max=0.0                                  //Maximum blade pitch angle for constant speed prop, (degrees)
beta_min=0.0                                  //Minimum blade pitch angle for constant speed prop, (degrees)
min_gov_rpm=1000.                                 //Miminum governed RPM
prop_tc=0.01                                    //Prop time-constant
gear_reduction_ratio=1.0                       //Propeller gear reduction ratio
fixed_pitch_beta=19                             //Fixed pitch angle of fixed pitch prop, (degrees)
low_speed_theory_limit=80.0                      //Speed at which low speed theory becomes blended in (feet/second)
prop_sync_available=0                          //Prop synchronization available? 0=FALSE, 1=TRUE
prop_deice_available=0                         //Prop de-icing available? 0=FALSE, 1=TRUE
prop_feathering_available=0
prop_auto_feathering_available=0
beta_feather=0.000000
power_absorbed_cf=0.000000
defeathering_accumulators_available=0
prop_reverse_available=0                       //Prop reverse available?  0=FALSE, 1=TRUE
minimum_on_ground_beta=0                       //Miminum pitch angle on ground, (degrees)
minimum_reverse_beta=0                         //Minimum pitch angle in reverse, (degrees)
[contact_points]      
point.0=1,  0.46, -3.45, -6.75, 1200, 0, 1.29, 0.0, .400, 2.5, 1.0, 1.5, 1.5, 2.0, 0.0, 0.0  
point.1=1,  0.46,  3.45, -6.75, 1200, 0, 1.29, 0.0, .400, 2.5, 1.0, 1.5, 1.5, 3.0, 0.0, 0.0  
point.2=3, -21.63,  0.0, -1.51, 1200, 0, 1.0, 0.0, 0.400, 2.5, 0.595, 2.0, 2.0, 7.0, 0.0, 0.0
2.5, 0.65, 0.0, 0.0, 7, 0.0, 0.0
static_pitch=16.65
static_cg_height=4.10
gear_system_type=3
[brakes]
parking_brake=0       //Parking brake available
toe_brakes_scale=1.000000  //Brake scalar
parking_brake=0

[Woodylepic]

its the gear the trouble i dont enderstand hall my whell position are in corect position (have checked whit nav light ) but something wrong whit the reference datum 7 feet ahead of the 1/4 position of the wing  ??? pls help !

[Hagar]

Sorry old chap. I would help if I could. I know very little about FS flight dynamics. I don't know which aircraft you based this on so I tried your contact_points, static_pitch & static_cg_height entries in the FS9 default Piper Cub Aircraft.cfg. It works fine so I don't think that's the problem.

I did notice the parking_brake=0 entry is duplicated but I don't think that's it either.

[Woodylepic]

Have find the trouble
my exterior and interior pivot point in gmax model was 7 feet back of the 1/4 edge of the wing that why the datum was ofset and the plane was glued on runway have move my interior and exterior general pivot at reference datum my plane take off now thank aniway !