I'm trying to get a ShuttleFleet 4.8 STS-1 scenario working. Apart from some trouble with AutoFCS not showing bases for which I've asked a seperate question in the Addon Support & Bugs section, the other problem I'm having is that the launch autopilot seems to have trouble maintaining the launch heading.
I want an inclination of 40.3 degrees at a circular 246km orbit corresponds to a launch azimuth of 58.7 degrees, and I've entered that into the scenario file. After launch with the GPC MFD program, I get a roll maneuver which puts me perfectly on that heading as the pitch program starts, no problems so far. However, as the launch progresses, the heading begins to drift south after SRB separation. I end up with a resulting inclination of 48-49 degrees instead as the heading drifts to ~65-70 degrees during the horizontal portion of the ascent. Am I supposed to be able to accurately hit an inclination with the launch autopilot and am doing something wrong, or is something not working right?
I want an inclination of 40.3 degrees at a circular 246km orbit corresponds to a launch azimuth of 58.7 degrees, and I've entered that into the scenario file. After launch with the GPC MFD program, I get a roll maneuver which puts me perfectly on that heading as the pitch program starts, no problems so far. However, as the launch progresses, the heading begins to drift south after SRB separation. I end up with a resulting inclination of 48-49 degrees instead as the heading drifts to ~65-70 degrees during the horizontal portion of the ascent. Am I supposed to be able to accurately hit an inclination with the launch autopilot and am doing something wrong, or is something not working right?