It looks like this issue was discussed previously:
https://www.simplerockets.com/Feedback/View/66V6o8/RCS-ignores-Fuel-Line-being-switched-off

But was conflated with an issue regarding the order that that tanks were being drained in:
https://www.simplerockets.com/Feedback/View/Y2V645/Monopropellant-drains-from-last-stage-to-first

Perhaps this will still be rejected as a "feature not a bug" but it would be really nice if there were a way to isolate monoprop to individual stages.

Repro

  1. Create a rocket with two monoprop tanks separated by a interstage.
  2. Attach an RCS nozzle to each tank
  3. Activate only one of the RCS nozzels and fire it until the first fuel tank runs out

Expected

Unless there is a fuel line or fuel transfer enabled on the interstage then RCS attached to one stage should not draw monoprop from tanks in another stage.

Bug Planned Found in 0.9.404.0
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6 Comments

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    @AnotherFireFox I would go with an entire new propellant category for cold gas instead of a power cycle

    6 months ago
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    @pedro16797 RCS is a form of rocket engine with less to none spooling time. The logical solution is making a power cycle for RCS, not separating both. If you wanna do an RCS with slow spooling engine, like Merlin RCS on old Startship, that's your choice.

    6 months ago
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    @sflanker personally I would post this as a suggestion rather than a bug report.

    6 months ago
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    @AnotherFirefox @sflanker there's still the issue of spooling times in classical rocket engines being too slow for a propper rcn, getting rid of them sounds like a really bad idea. An option in the case of wanting to yeet them could be making cold gas a type in the rocket engine part.

    6 months ago
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    Mod sflanker

    @AnotherFireFox that does seem like a reasonable workaround for players wanting more advanced and realistic behavior 👍

    +1 6 months ago
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    Simple and obvious solution which can entail a lot of other positive effects: Get rid of RCS and make all reaction propulsion system RocketEngine

    +1 6 months ago

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