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[Peewee]

It keeps your craft pointed in one direction, by semi-intelligently yanking the joystick around.

[Scelly9]

Ok, I need to buy this now.

[Trekkin]

What does an ASAS do anyway? As I haven't actually ever used them yet.

ASAS takes every system on the craft that can change its attitude and engages them opposite the direction of any existing change in attitude. It basically keeps the craft going in a straight line as well as it can, although it cannot determine which straight line it ought to follow.

It will also empty your RCS tanks very quickly if left on, since it constantly compensates for whatever change in attitude it last made. This is why the fins wobble so much with it on.

[LoSboccacc]

note that it keep you pointed to an absolute direction, not a direction relative to, say, the planet.

as an example, if you point the nose at 0 degree north from the center, when you reach the pole you will be pointed upwards (warning: ideal though experiment)

[Sirus]

That said, it's very helpful for getting large rockets out of the atmosphere without tilting over. Once in orbit though, you'll need to make your own adjustments.

[Sordid]

It's helpful for medium-sized rockets. Very large rockets will begin oscillating when you turn the RCS on and eventually break.

[LoSboccacc]

If you put more stuff at the bottom of a large rocket the drag will help keeping your nose pointed in the travel direction. Make sure you have enough control to change that direction, however.

[Graknorke]

By the way, is there a reason why my spaceplanes always veer off the runway, even when I place all of the parts using symmetry?

[Rex_Nex]

No. They just do that.

[Sean Mirrsen]

It's all phantom forces due to parts overlapping very slightly. It'll be fixed for 0.16, according to the devlog.

[Mongol13524]

PTW

[Drakale]

So, I was trying to reproduce some of the Planetside ships, and I accidentally managed to make a working VTOL Galaxy craft.

Behold!

Spoiler (click to show/hide)

VTOL mode

Horizontal thruster engaged

Too bad images do not really do it justice. S.A.S. is needed for the initial lift off, then once the rear thruster in engaged SAS can be turned off and the craft piloted normally. It's surprisingly easy to steer, much much easier than a conventional Kerbal aircraft.

[Scelly9]

That is really cool.

[Rose]

Now we need pivoting engines.

[Sordid]

Now we need pivoting engines.

-> http://kerbalspaceprogram.com/forum/index.php?topic=10662.30