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During the launch and ascent phase, however, thrust must be applied over a long period with a major component of thrust in the opposite direction to gravity, so gravity losses become significant. Gravity losses as a proportion of delta-v are minimised if maximum thrust is applied for a short time, or if thrust is applied in a direction perpendicular to the local gravitational field. Gravity losses depend on the time over which thrust is applied as well the direction the thrust is applied in.
![kerbal space what is crossfeed kerbal space what is crossfeed](https://i.imgur.com/kh7BN.png)
#Kerbal space what is crossfeed plus
It is the difference between on one hand the delta-v expended and on the other hand the theoretical delta-v for the actual change in speed and altitude, plus the delta-v for other losses such as air drag, that are experienced by a thrusting spacecraft. In other words, it is the cost of having to hold the rocket up in a gravity field. In astrodynamics and rocketry, gravity drag (or gravity losses) is a measure of the loss in the net performance of a rocket while it is thrusting in a gravitational field. The piping for this will be more complex than normal, but it should be lower in weight than the extra pumps or strengthening of the outer tanks.
![kerbal space what is crossfeed kerbal space what is crossfeed](https://i.imgur.com/GICvczu.jpg)
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This is hard to get perfectly right though and will add extra weight. Put a pump between the outer tanks and the middle one, so all the fuel the engines of the middle booster used are replaced immediately from the outer tanks.You can create your own curation by editing the value of the flair parameter in the search box to be a mission name or type of post, such as flair:"CRS-8"! Industry RelationsĪre you in the rocketry/spacecraft industry? Attending a conference? Want subreddit flair? If so, please contact the subreddit moderators at you need a pump then? You want to use the two outer tanks first, if the tanks are just connected, all their levels will stay exactly the same. SpaceX Time Machine - searchable mission archiveĬheck out our multireddits for spaceflight companies and solar system bodies! Curationsīrowse the following curations of r/SpaceX to search and filter content!.SpaceXLaunches - launch campaign tracking.Rocket.Watch - notifications, stats, & history.SpaceX Stats - countdown and statistics.Rocket Emporium general spaceflight (SpaceX channel).If you find an event or conference for which a SpaceX representative will be in attendance, please message the moderators for inclusion in the sidebar! Well-formed - Is the post/comment in the right thread? Does the post have a descriptive and accurate title, a clean link, and the appropriate format?įor more, please read our community rules, and check out the Wiki & FAQ! Select Upcoming Events Substantive - Does the post/comment contribute to a serious, thoughtful and technically-oriented discussion? Q5. Novel - Does the post contribute meaningful new information or questions to the community? Q4. Relevant - Is the post directly and causatively related to SpaceX? Is the comment on-topic? Q3. Respectful - Is the post/comment conducive to a healthy community and a civil discussion on the merits? Q2. Community Rulesīefore posting or commenting, please ask yourself the following five questions: Q1. This board is not an official outlet for SpaceX information. Welcome to r/SpaceX, the premier SpaceX discussion community and the largest fan-run board on the American aerospace company SpaceX. Switch to r/SpaceXLounge → Next launch is Starlink Group 2-2, date is tbd. This subreddit is fan-run, and is not an official SpaceX website.