Rcs flow

[thevegimobil]

How do I get the lower rcs tanks to drain first? Thanks.

[sal_vager]

They are supposed to drain in order from bottom to top, though this sometimes breaks when the upper RCS tanks are added late in the build.

Try removing all the RCS tanks, dropping them back in the parts lists, then fitting new tanks starting at the top and working your way down, this should make the code search through the tanks correctly

[thevegimobil]

If I put the tanks I want for the orbital stage on last will that make them drain last? Thanks

[sal_vager]

The last tanks placed should drain first, as KSP assumes that you are building from the top down, and the first tank you place is often on the lander or return stage.

The RCS fuel logic can get messed up at times.

[thevegimobil]

No that wasn't it... It would drain from the top down into lower stages so was left with no rcs for orbit... I took the orbital tanks off... Went to launch pad then went back to vab and added the top tanks again... Works from the bottom now....

[sal_vager]

Well I'm just glad it's fixed thevegimobil

[MrMoog]

The last tanks placed should drain first, as KSP assumes that you are building from the top down, and the first tank you place is often on the lander or return stage.

The RCS fuel logic can get messed up at times.

This logic works in most cases, but not always. Sometimes when creating complex ships with escape pods, and modifying them a lot in the VAB, you can get to a point where nothing you do will fix the problem. I have a craft design that is broken for good, whatever I do, I can never get the RCS to drain in the order I want, even when removing them all and reattaching them in every possible order and/or stage.

A simple, unbreakable rule would be very useful, and would remove the need to do a full up RCS test on the launchpad every time I test a new design.

[vexx32]

Yeah, the workaround usually works... but it'd be good to see a fix for this one soon.

[draeath]

It would be nice to be able to manually define what tanks flow where, and in what order.

It would also be nice to be able to manually fix stage groupings. I don't know how many times I try to add a quad of engines or such with symmetry and end up with 1x3+1 engines in the staging :/

My OCD starts tingling at that point.

[Wyrm]

Quite frankly, I don't see why the RCS draining logic doesn't just use the RCS tank with the highest staging number. Preferably drain from RCS tanks due to be dropped off sooner. Simple and sensible. (Right?)

[pwnedbyscope]

Quite frankly, I don't see why the RCS draining logic doesn't just use the RCS tank with the highest staging number. Preferably drain from RCS tanks due to be dropped off sooner. Simple and sensible. (Right?)

<-this, it would make staging and rcs placement so much easier if this was the case, also be helpful if rcs's would only activate if the stage the were in was activated