Monopropellant drains from the last stage then gradually to the first.
This means that when a staging occurs, fully topped monopropellant tanks will be thrown away.


What should happen is that the lowest (first stages) tanks should be drained first, so that when it stages the empty tank will be thrown away while the remaining tanks on board stay fully fueled.


Here is a craft with three stages. Use translation mode and pitch down to drain the tanks with the single -RCS nozzle on the top, and notice it drains the topmost tanks first.
stuff


There is also a suggestion

Bug Done Found in 0.7.0.5 Fixed in 0.7.1.4
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9 Comments

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    Dev Pedro

    @Kell I wanted to fuel a rocket from a tower and I ditched the idea because of that.
    If we can autotransfer we can make reusable crafts so much easier (and if autotransfer only works inside of a subcraft at least we only have to select one tank)

    5.1 years ago
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    I wanted the higher transfer rate because I have a ship that takes in propellant from docked tanks. @AndrewGarrison

    5.1 years ago
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    Dev Pedro

    @AndrewGarrison COOOOL

    5.1 years ago
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    @Kell I did not change the fuel transfer rate to be correlated to the size of the tank(s), but I did double the transfer rate. Also, fuel transfer increases with the number of tanks draining. We also added fuel cross-feed options on side interstages so now you can auto transfer fuel inwards, or outwards, or equalize between two tanks.

    5.1 years ago
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    @pedro16797 Yes.

    5.1 years ago
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    Is it possible to correlate fuel flow rate to tank size so we don’t have to wait forever for tanks to fill and not being able to use external tanks. @AndrewGarrison

    5.1 years ago
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    Dev Pedro

    @AndrewGarrison Nice :D. Will it be possible to give multiple tanks the same priority so they drain at the same time? That may fix the unsymmetrical fuel consumption bug too

    +1 5.1 years ago
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    This will be improved in the next update. Mono, Electricity, and Jet fuel tanks are now grouped together at the sub-craft level. If you have a satellite that is a sub-craft, then its tanks won't be used by the main craft unless you enable fuel transfer.

    You will also be able to set priority, so if you don't like the way your tanks are draining, you can alter their priority to change that. Mono and Battery tanks will auto-calculate their priority to start draining from the lowest tanks first, as @Kell has suggested here. @pedro16797

    +1 5.1 years ago
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    Dev Pedro

    I think the solution is making monopropellant and electricity wprk like fuel and not as a common source for all the craft, we should be able to stop them from going to a part we don't want :(

    +1 5.2 years ago

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