MustardDimension Posted May 2, 2012 Share Posted May 2, 2012 My ship design for mun landings consists of 4 external tanks and a centre tank for the landing stage, but I added fuel lines so the centre tanks stay full but it then drains the external tanks during the launch stage >At the moment I am using an RCS tank to stop the flow, but in the interest of weight I want to remove that tank, so is there any other way? Cheers all Link to comment Share on other sites More sharing options...
sal_vager Posted May 2, 2012 Share Posted May 2, 2012 I\'m guessing you attached your fuel lines to the lander engine, that\'s why the fuel is going through to the engines below.If this is the case just fit the fuel lines from the external tanks to the tank above the lander engine, any part with fuel lines attached has fuel crossfeed set to true, so you can fit fuel lines to stuff like an ASAS above an engine and it\'ll work.Edited for spelling. Link to comment Share on other sites More sharing options...
Doctor Lag Posted May 2, 2012 Share Posted May 2, 2012 No there\'s no way to stop fuel flow... as sal mentioned any part with fuel crossfeed enabled will transfer fuel.If you didn\'t want the fuel going to the center tank, why did you add the fuel lines? I\'m missing something there. Link to comment Share on other sites More sharing options...
MustardDimension Posted May 2, 2012 Author Share Posted May 2, 2012 I wanted it to go to the centre tank on the upper stage rather than the lower, and I\'v worked it all out now anyway, attached the fuel lines to the top decoupler Link to comment Share on other sites More sharing options...
boolybooly Posted May 2, 2012 Share Posted May 2, 2012 Your post doesn\'t describe the problem clearly enough to help you MustardDimension.Attaching a piccy of the launch craft might help. Link to comment Share on other sites More sharing options...
thorfinn Posted May 2, 2012 Share Posted May 2, 2012 I would advise going in the *.cfg of all the decouplers and disabling fuel crossfeed. It\'s really counter-intuitive, and with fuel lines we can explicitely route fuel if we need to anyway. Link to comment Share on other sites More sharing options...
sal_vager Posted May 2, 2012 Share Posted May 2, 2012 I would advise going in the *.cfg of all the decouplers and disabling fuel crossfeed. It\'s really counter-intuitive, and with fuel lines we can explicitely route fuel if we need to anyway.This would make it hard to use a few of my stock designs Does anyone actually know the reasoning behind having fuel crossfeed on stack decouplers? It\'s probably not that important as that wasn\'t the issue with MustardDimension\'s rocket, it\'s good he figured it out. Link to comment Share on other sites More sharing options...
hubbazoot Posted May 2, 2012 Share Posted May 2, 2012 My ship design for mun landings consists of 4 external tanks and a centre tank for the landing stage, but I added fuel lines so the centre tanks stay full but it then drains the external tanks during the launch stage >At the moment I am using an RCS tank to stop the flow, but in the interest of weight I want to remove that tank, so is there any other way? Cheers all I THINK, I haven\'t tested this yet, but I will, that you could add a fuel line going from the lower tanks back to the upper tanks to route the fuel back up there. I\'ll test it for you now.This would make it hard to use a few of my stock designs Does anyone actually know the reasoning behind having fuel crossfeed on stack decouplers? It\'s probably not that important as that wasn\'t the issue with MustardDimension\'s rocket, it\'s good he figured it out.Since engines don\'t have a crossfeed, it never really made sense to me...which using the ultra-small engine would be lighter than an RCS tank and would also work. Link to comment Share on other sites More sharing options...
hubbazoot Posted May 2, 2012 Share Posted May 2, 2012 Just tested it out. Nope, doesn\'t work. The stage separator is in the way. I\'ll try it using an intermediary tank to bridge the gap.Edit:Nope. Link to comment Share on other sites More sharing options...
sal_vager Posted May 2, 2012 Share Posted May 2, 2012 You can get pipes to fit from a tank to a decoupler, then up again to another tank, but I found some weird fuel drain problems when trying to make tanks empty from bottom to top, and some weird things can happen when you have two fuel lines instead of one, or if you have the fuel flow spit then rejoin.Also no need for an extra bridging tank, just fit lines to a radial decoupler, works the same. Link to comment Share on other sites More sharing options...
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