alagreca
Member
Whilst using AMSO 1.2 with Orbiter build 110824 the autopilot always stops at exactly 6:40 GET. It is still possible to reach a good parking orbit with a little practice as the AMSO Saturn V is quite stable with good response to manual controls. This does not seem to be related at all to the former LOI crossrange issue as the crossrange is always well past it's peak and in decline when the autopilot stops. I have also noticed that Multistage 2 rockets with guidance files end up with lower than normal apogees and sub orbital perigees. With AMSO the rocket would normally be close to it's 187 KM parking orbit altitude by GET: 6:40 when the autopilot stops. I am now seeing numbers in the 170's at this point. AMSO'S autopilot is most likely stopping because it can't gain it's proper altitude for some reason in a similar way to how it was stopping because it could not lower the LOI crossrange in that case. I just cant figure out why. At first I thought it might be the new atmosphere model but switching to the static model produces the same results. The other main suspect that comes to mind is that orbiter may have changed the way it calculates the ISP for a rocket engine when converting fuel consumption to DV. Does anyone have any ideas.