kerbal-space-program
In KSP 0.90 (beta), command pods only provide SAS when a pilot is onboard. A probe command pod like the Stayputnik doesn't have a pilot aboard. I tried adding an SAS module to my Stayputnik probes, but this doesn't enable SAS. How does one get SAS working with a probe in KSP 0.90?
There's a similar but obsolete question about SAS on piloted vessels in a much earlier version of KSP. How to get SAS working in Kerbal Space Program
The SAS module is designed to keep your craft on its current course by means of altering fins and micro-rockets.
You should turn the SAS off while you maneuver your craft onto the desired heading, then turn it back on to have it automatically stay on that heading.
If you find the SAS is not staying on course, you may need to make your craft more maneuverable with the addition of extra fins or micro-rockets.
You're best bet is to err on the side of safety and use too many. The potential financial loss for chutes ($700 each for radial) is much less than the potential financial loss of your entire ship.
I'd love to be able to give you some simple formula like "Use 1 chute for ever x tons". But there is no simple formula. The complex formula can be calculated using the tool you've linked to.
That said, these are some excellent tips:
or i-beams
instead of lander legs
. Modular girders and i-beams have 6x higher impact tolerance (80m/s) than the strongest lander legs (12m/s). You can land a 1000 ton ship on Kerbin with a single chute if it can survive a 80m/s landing.Good luck.
Best Answer
The inline reaction wheels provide rotation torque, but no automatic SAS functionality. This feature now has to be provided by the probe core itself. The Stayputnik as the most basic probe core doesn't have SAS capabilities. The first probe core which provides SAS is the Probodobodyne OKTO.
On a manned ship, you can get SAS capabilities by having a kerbal with the Pilot class on board.