4throck
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- Jun 19, 2008
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I need some advice on the best way to implement a two stage aerodynamic sounding rocket using multistage guidance. The rocket I'm trying to simulate is the VS-40 (http://en.wikipedia.org/wiki/VS-40).
Here it is in Orbiter:
As the rocket has no active control surfaces (besides fixed tail fins) and no RCS, it makes sense that the guidance is only used to set the initial launch attitude.
I think that the best way to do it would be to pitch to the real launch inclination (about 85º) at 0 seconds and issue no further commands.
But I know that the rocket fins induce a slow roll (about 2º second) so a roll command would also make sense.
I've tested some basic guidance files but I'm not happy with the results. I can force the desired heading OR roll during all the flight, but the rocket struggles to keep the attitude. If I only set the values initially, it gets into a spin almost immediately.
The meshes are centered on 0,0,0 and all diameters and engine parameters are according to the source values.
Any advice or add-ons that I can look into?
Here it is in Orbiter:
As the rocket has no active control surfaces (besides fixed tail fins) and no RCS, it makes sense that the guidance is only used to set the initial launch attitude.
I think that the best way to do it would be to pitch to the real launch inclination (about 85º) at 0 seconds and issue no further commands.
But I know that the rocket fins induce a slow roll (about 2º second) so a roll command would also make sense.
I've tested some basic guidance files but I'm not happy with the results. I can force the desired heading OR roll during all the flight, but the rocket struggles to keep the attitude. If I only set the values initially, it gets into a spin almost immediately.
The meshes are centered on 0,0,0 and all diameters and engine parameters are according to the source values.
Any advice or add-ons that I can look into?