{"action":"created","issue":{"url":"https://api.github.com/repos/MuMech/MechJeb2/issues/605","labels_url":"https://api.github.com/repos/MuMech/MechJeb2/issues/605/labels{/name}","comments_url":"https://api.github.com/repos/MuMech/MechJeb2/issues/605/comments","events_url":"https://api.github.com/repos/MuMech/MechJeb2/issues/605/events","html_url":"https://github.com/MuMech/MechJeb2/issues/605","id":84299474,"number":605,"title":"Request: Automate aerobraking","user":{"login":"Rohaq","id":246865,"avatar_url":"https://avatars.githubusercontent.com/u/246865?v=3","gravatar_id":"","url":"https://api.github.com/users/Rohaq","html_url":"https://github.com/Rohaq","followers_url":"https://api.github.com/users/Rohaq/followers","following_url":"https://api.github.com/users/Rohaq/following{/other_user}","gists_url":"https://api.github.com/users/Rohaq/gists{/gist_id}","starred_url":"https://api.github.com/users/Rohaq/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Rohaq/subscriptions","organizations_url":"https://api.github.com/users/Rohaq/orgs","repos_url":"https://api.github.com/users/Rohaq/repos","events_url":"https://api.github.com/users/Rohaq/events{/privacy}","received_events_url":"https://api.github.com/users/Rohaq/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-06-03T01:35:50Z","updated_at":"2015-06-03T13:49:44Z","closed_at":null,"body":"Nowadays, the thing that takes the longest time in a mission tends to be aerobraking for landing in atmospheres, or circularizing: Dropping my Periapsis into the atmosphere enough to lower my Apoapsis by a considerable amount, without burning up during the process.\r\n\r\nFor example, right now I do this when returning from the Mun to Kerbin by dropping my Pe to about 50km, then a couple of aerobraking maneuvers later, dropping it to 45km, repeating until I either hit a low enough Ap to circularize at (or near), or to re-enter the atmosphere for a landing at a slow enough speed to avoid burning up on re-entry.\r\n\r\nIt would be really nice if MechJeb could autocalculate the lowest Pe the craft could take per orbit without breaking up (facing retrograde, since this is usually the optimal re-entry direction to avoid heating), and set up the maneuver node at Ap to lowering it each orbit to aerobrake to lower it as much as possible, either to eventually hit a target Ap, or to land safely."},"comment":{"url":"https://api.github.com/repos/MuMech/MechJeb2/issues/comments/108427451","html_url":"https://github.com/MuMech/MechJeb2/issues/605#issuecomment-108427451","issue_url":"https://api.github.com/repos/MuMech/MechJeb2/issues/605","id":108427451,"user":{"login":"BloodyRain2k","id":1014362,"avatar_url":"https://avatars.githubusercontent.com/u/1014362?v=3","gravatar_id":"","url":"https://api.github.com/users/BloodyRain2k","html_url":"https://github.com/BloodyRain2k","followers_url":"https://api.github.com/users/BloodyRain2k/followers","following_url":"https://api.github.com/users/BloodyRain2k/following{/other_user}","gists_url":"https://api.github.com/users/BloodyRain2k/gists{/gist_id}","starred_url":"https://api.github.com/users/BloodyRain2k/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/BloodyRain2k/subscriptions","organizations_url":"https://api.github.com/users/BloodyRain2k/orgs","repos_url":"https://api.github.com/users/BloodyRain2k/repos","events_url":"https://api.github.com/users/BloodyRain2k/events{/privacy}","received_events_url":"https://api.github.com/users/BloodyRain2k/received_events","type":"User","site_admin":false},"created_at":"2015-06-03T13:49:44Z","updated_at":"2015-06-03T13:49:44Z","body":"If you want easymode put in some heatshields and airbrakes, make sure the thing can handle 20~30 G and just DROP it onto KSC.\r\n\r\nStock aero has a huge flaw in the heat system which is exposure, if you just blast through the atmosphere you won't burn up, and if you get it right you can lose 3 km/s easy and get to 500 m/s at 5 km and just chute the rest.\r\n\r\nThe hardest part is probably finding out the best angle for your craft, but I've dropped probes from minmus that used a 909 as heatshield (rather small S1 probes) and they just blast through and when low enough simply chute the rest.\r\n\r\nIf anything the addition of a landing angle to target would be nice, aka an \"aggression\" setting for the landing AP, more aggressive = more straight down instead of as shallow as possible.\r\nReminds me that I need to test if the latter still makes it derp out because the PE goes below 0 and then gets corrected above 0 again which makes it start all over again."}}