paolot

Thank you all for the answers and the suggestions. I tried to use tail fins/wings with an otherwise very unstable craft, and things went a bit better: I started the turn at 70 m/s at some hundreds meters of altitude (desired orbit was polar). But I couldn't use SAS, because it causes strong (destructive!) spin and roll in every directions, so I had to use manual piloting. The craft (a probe) is here, if someone wants to try it. 5thHorseman, at this link from your link, it is said that Shuttle starts the roll at about 255 m (767 feet), after 10 seconds of flight, and ends it at about 1055 m. Did you mean this? It varied for the different crafts, as I used throttle from 50% to 100%. But yes, sometimes I got 100 m/s before 1 km altitude.

Thank you, ghpstage! I said "unrealistic" because Space Shuttle at launch didn't seem very gentle during the turn. In KSP versions before 1.0.0, I never had problems in keeping direction at 45° angle from rather low altitude (below 1000 m) and velocity, using SAS obviously.

Please, when do you perform the gravity turn in 1.0.2? At which speed and altitude? I play KSP from 2012 (maybe version 0.13), and up to 0.90 I started gravity turn at 50 m/s, placing the nose of the crafts at an angle so that the direction indicator is at 45°, and when the apoaxis is at 75-80 km I go horizontal to gain enough lateral velocity to go in a good orbit. Now, in 1.0.2, if I do this way, the craft (every craft I try) starts to spin and rotate, and even adding more and more SAS modules is no use at all! I have to go straight vertical up to 30 km or so, and then perform a very gentle turn!!!! But it seems to me very unrealistic!! Thank you!

- KSP Version (no Steam): > from file "buildID.txt": build id = 008302015.04.26 at 19:45:40 CESTBranch: master > from file "KSP.log": Kerbal Space Program - 1.0.0.830 (WindowsPlayer) OS: Windows Vista Service Pack 2 (6.0.6002) CPU: Intel® Core2 Duo CPU P8400 @ 2.26GHz (2) RAM: 3070 GPU: ATI Mobility Radeon HD 3650 (1146MB) SM: 30 (Direct3D 9.0c [aticfx32.dll 8.17.10.1129]) RT Formats: ARGB32, Depth, ARGBHalf, RGB565, ARGB4444, ARGB1555, Default, DefaultHDR, ARGBFloat, RGFloat, RGHalf, RFloat, RHalf - What Happens: game crashes. - Mods / Add-Ons: no mods, all stock - At this link there are the files generated during the various crashes (zipped), the craft I was flying, the "output_log.txt" file and the "KSP.log" file saved on April 29th at 23.45 (GMT+1), and the "DxDiag.txt" file. Steps to Replicate: 1) Load the craft V-0002 and launch it. 2) Reverting the flight to the VAB (sometimes the first time, sometimes the second time), the game crashes. Thank you for your help!