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Auto Credit Based on KellyNyanbinary's Piston and Hinge Rich Crafts Explode Upon Load.

Monopropellant drains from 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.



Name Location Part Count Mass Altitude Velocity
K-III Droo 74 10,996kg 99 km 3.41 km/s
New Horizons Sun 19 0kg 501,239.5 Mm 11.45 km/s
Rover Droo 48 1,389kg Ground 0.0 m/s
Craft-156 Droo 42 2,636kg Ground 0.0 m/s
HEX Sys Small Lander Cylero 170 0kg Ground 0.0 m/s
Tourist Test 2 Droo 65 20,052kg Ground 0.0 m/s
Tourist Test 2 Droo 65 21,829kg 81 km 3.43 km/s
Craft-227 Droo 1 200kg Ground 0.0 m/s
Craft-231 Droo 2 204kg Ground 0.0 m/s
Monopropellant drain test Droo 7 1,787kg Ground 0.0 m/s

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