K_mu

Thanks, I'll try to plan my next trip using this and your example. Not that I can remember. The Mk1 Lander Can was equiped with four Mk12 Radial parachutes, one MK16 parachute and had its own heat shield, the reentry worked just like the one I had done from the mun/minmus so far. Once again tkanks, seems to be a great community around here :)

Disabling crossfeed does work, thank you very much all . This will allow me to be more precise in my rocket design ! Fortunately I found a launch window allowing me to bring Jebediah back with those 700 m/s ^^ My rockets are still pretty basics but I will have a look at the maths, out of curiosity. Again thank you everyone for responding so quick !

Hello Geonovast, Thanks you very much for you (very quick !) answer ! I think the first point is the one, It makes sense... Is there anyway to avoid the delta V "displayer" adding both values from the lander and the transfer stage ? @ paul_c : I meant docking, you're right Here are a few screenshots. First picture is before the separation, second is after the separation, third is before docking and the last one is the result of the docking, with 800 m/s of delta V. https://imgur.com/DOIpYVd

Hello everyone, I have been playing KSP for a few weeks now and today I finally reach Duna. The trip is going pretty well and I still have 1700 m/s of delta V left for the return as my ship is orbiting at 61km from Duna's surface. I then detach my lander, proceed to land it on the planet, make some science, and then go back for an orbital encounter with the transfer stage. But when the encounter is done, the delta V displayed by my vessel is 700 m/s instead of the previous 1700 ! I'm pretty confuse because I see no reason why my ship could be heavier, especially after burning almost all the fuel of my lander. Is there any explanation to it ? Any way to avoid it ? Sorry if this question have already been asked, I've looked in the forum for a few key words and was unable to find anything related. Thanks for taking the time to read this, and have a nice day :)