Interesting mod , I actually saw it on the workshop earlier today . I ' d argue against bringing ice when flying with hydrogen though as you mention in your post . Hydrogen in a tank doesn ' t increase your ships mass , ice does . As well you can quite easily get even a decently overbuilt ship to space with half a small tank of hydrogen at default ship speed limits . I ' m about to sound like a massive stickler so first let me say it does look good and I do like the idea . You ' ve put together what looks like a well done mod and you should certainly feel proud of that . There are a three things which stop me from installing this mod personally though , and in many ways they are things which are specific to me , but I thought I ' d give feedback anyway . 1 . It seems possible to leave a planet using this thruster without hydrogen . At the moment hydrogen is the most thrust efficient fuel in the game and many of the other values are balanced around the idea that flying to space should require it . I like the idea of a new fuel and thruster type , but I worry that it might alter the games balance if it can be used in atmo and without any real limitation other than fuel . If that ' s not the case of course there ' s no issue . 2 . Ramscoops working in space makes very little sense . The average density of matter in space is about 1 atom per cubic centimeter , I ' ll increase that to 2 just to be extra forgiving . Traveling 1 lightyear then with a 1 km 2 ramscoop will get you about 599 , 600 , 000 , 000 , 000 , 000 , 000 atoms . Assuming all of those are free xenon atoms then in 1 lightyear of travel you ' d have almost 0 . 0001 mols of xenon , 0 . 0022 liters . Again that ' s with a 1 km surface area after traversing a lightyear of space . Near the aurora where the earths magnetic fields have focused the particles from the solar wind particle counts can get as high as 7 per cm 3 , which still isn ' t anywhere near enough . I like the upper atmosphere collection , especially since grazing planets seems like a great and unique way to refuel , but collecting fuel or anything from the vacuum feels flawed to me . 3 . The fact that these thrusters can be adjusted to have different fuel characteristics without any drawback is a little odd for me . It seems like it makes them too strong without any drawbacks . I ' d much rather see three different classes of thruster , each a little more expensive and with awkward or large footprints so that designing your ship with xenon in mind required consideration . Or have it set so that burning hard would damage your thrusters as it was maintained . Thrusters are generally outward facing so repairing them wouldn ' t be too much of a frustration if it was used , as mentioned during emergencies . Now I will say all of these problems can be played around by setting personal limitations . I can just not use them in atmosphere if I don ' t want to escape the planet with them . I can simply turn off my ramscoops unless I ' m near a planet , and I can simply choose not to make use of the various thrust modes unless I ' ve designed for it somehow . But at that point the mod just loses its appeal . Again I will restate these are all personal to me , other people will obviously feel differently and again I will say that you should feel good about putting this mod together . I ' m sure it took a not inconsiderable amount of work .