Question Spacecraft 3 : Ground track.

[Notebook]

On the trip from the hangar to the launcher, the assembly dosen't follow the track:
http://s89.photobucket.com/albums/k207/Notebook_04/?action=view&current=trackcheck1.flv

The composite, Handling Dollie, Handling Frame & F2 are all sc3 vessels.

Any ideas why?

The tracks are at 90 degrees, and the vessels start off at 270 degrees, so I was assuming they would just match alignments.

All input appreciated!

N.

 

[Kaito]

maybe you're slightly turning?
that does seem odd...

 

[Notebook]

I don't think so, I haven't put any values in the [Aerodynamics] section, and I don't let it get up to any speed.
It will try and fly if you let it!

If I repeat several times, it gets up to several tens of degrees off 90. Is it because its a vessel?

N.

 

[Dambuster]

I know this is a really long shot, but could it be to do with the Earth's rotation? When I was testing out Dan's UMMU 2.0, I noticed that the command to get your astronaut to strafe left/right actually moved the astronaut in a slight curve as well. I'm not sure why, but I had the idea that this could be to do with the rotation of the planet/Moon under the UMMU. Could whatever's causing that also be causing your problem?

 

[Notebook]

It could well be, can't think of any other reason. It always moves in the same direction, the heading decreases, never increases.
Haven't pursued it much, I was wondering if anyone had seen it before, so it looks like you have! Always good to know.

Next is to figure out a way around it. Could just lose the tracks, and accept it dosen't go in a straight line. Very Newtononian...

N.

 

[BrianJ]

I don't think so, I haven't put any values in the [Aerodynamics] section, and I don't let it get up to any speed.
It will try and fly if you let it!

Unles you assign zero values to all the parameters in the [Aerodynamics] section, they will take default values.

Could be the problem.Try this:

[AERODYNAMICS]
VAIRFOIL_ATTACK=(0,0,0)
VAIRFOIL_CHORD=0
VAIRFOIL_AREA=0
VAIRFOIL_ASPECT=0
VAIRFOIL_EFFICIENCY=0
VAIRFOIL_WAVE_DRAG=0
VAIRFOIL_CD0=0
HAIRFOIL_ATTACK=(0,0,0)
HAIRFOIL_CHORD=0
HAIRFOIL_AREA=0
HAIRFOIL_ASPECT=0
HAIRFOIL_EFFICIENCY=0
HAIRFOIL_WAVE_DRAG=0
HAIRFOIL_CD0=0
HAIRFOIL_LIFT_1=(-180,0)
HAIRFOIL_LIFT_2=(0,0)
HAIRFOIL_LIFT_3=(180,0)
VAIRFOIL_LIFT_1=(-180,0,0)
VAIRFOIL_LIFT_2=(0,0,0)
VAIRFOIL_LIFT_3=(180,0,0)
RUDDER_ATTACK=(0,0,0)
RUDDER_AREA=0.0
RUDDER_LIFT=0
AILERON_AREA=0.0
AILERON_LIFT=0
AILERON_ATTACK=(0,0,0)
ELEVATOR_AREA=0.0
ELEVATOR_LIFT=0
ELEVATOR_ATTACK=(0,0,0)
ELEVATOR_TRIM_AREA=0.0
ELEVATOR_TRIM_LIFT=0
ELEVATOR_TRIM_ATTACK=(0,0,0)
RUDDER_TRIM_ATTACK=(0,0,0)
RUDDER_TRIM_AREA=0.0
RUDDER_TRIM_LIFT=0
FLAPS_ATTACK=(0,0,0)
FLAPS_AREA=0.0
FLAPS_LIFT=0
SPEEDBRAKE_ATTACK=(0,0,0)
SPEEDBRAKE_DRAG=0

Any help?
Cheers,
Brian

 

[Notebook]

Thanks Brianj, I'll give that a go.


Well, I gave it a go and it went!
http://s89.photobucket.com/albums/k207/Notebook_04/?action=view&current=trackcheck2.flv

Just after the animation finishes, is when the retro thrust is applied.
Dosen't like that [aerodynamic] content. Good fun though.


N.