Those posts may origin to experimental nature of this new feature, when it was not clear at first, if the design of the ship or of the engines was wrong. Now there are little complaints left. While mass distribution of a SV is without regard, it matters on HV, a lot. You should control that from time to time with the building tool: press 'N', select 'show center of mass' and watch the yellow and blue balls: yellow shows the center of geometry, blue that of mass. I have had good results, if: The center of mass lies centered lateral, as deep as possible and slightly before the center of geometry. The hoover engines are equally distributed along the outline of the HV, at least on in every corner (usually some type of rectangle). To guarantee to digging in the ground with the nose, i place one additional hoover engine on the very tip of the craft, therefore i had the center of mass set slightly before the geometrical one. If there are too little h-engines, you will constantly bump into the ground. Too many, and flying gets less stable (whats good for maneuverability, if you can handle it and is not exaggerated). Lastly the acceleration by your thrusters is important. When going a slope, physics is quite good simulated here: the steeper the slope, the less of the weight of the HV can be lifted by the hoover engines, and the more the thrusters have to work. The better the acceleration in a given direction, the steeper the slope you can go. That is really important for mining with the new drills: If your backward acceleration cannot hold the ships weight at the steep angles, you need to drill, it will dig its own grave. While you can get away with pronouncing the forward acc and neglecting lateral and backwards on usual travelling, you have to make sure for certain amounts of acc in every direction for mining. If you want to be sure, you go for slightly more than the gravitational acc on the planet you are on: 8m/s^2 on Akua, 10 on Omicron and so on. Uuups, got quite long... sorry for offtopic here. I do post it nevertheless, maybe Arrclyde was just the only one who did actually ask. And, as always: this is just my experience, i could be wrong.