{"action":"created","issue":{"url":"https://api.github.com/repos/PX4/Firmware/issues/5739","repository_url":"https://api.github.com/repos/PX4/Firmware","labels_url":"https://api.github.com/repos/PX4/Firmware/issues/5739/labels{/name}","comments_url":"https://api.github.com/repos/PX4/Firmware/issues/5739/comments","events_url":"https://api.github.com/repos/PX4/Firmware/issues/5739/events","html_url":"https://github.com/PX4/Firmware/issues/5739","id":184718694,"number":5739,"title":"px4 flies to HOME_ALT+HOME_ALT and lands earlier than expected","user":{"login":"marketingandmoney","id":19644349,"avatar_url":"https://avatars.githubusercontent.com/u/19644349?v=3","gravatar_id":"","url":"https://api.github.com/users/marketingandmoney","html_url":"https://github.com/marketingandmoney","followers_url":"https://api.github.com/users/marketingandmoney/followers","following_url":"https://api.github.com/users/marketingandmoney/following{/other_user}","gists_url":"https://api.github.com/users/marketingandmoney/gists{/gist_id}","starred_url":"https://api.github.com/users/marketingandmoney/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/marketingandmoney/subscriptions","organizations_url":"https://api.github.com/users/marketingandmoney/orgs","repos_url":"https://api.github.com/users/marketingandmoney/repos","events_url":"https://api.github.com/users/marketingandmoney/events{/privacy}","received_events_url":"https://api.github.com/users/marketingandmoney/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/PX4/Firmware/labels/bug","name":"bug","color":"fc2929"},{"url":"https://api.github.com/repos/PX4/Firmware/labels/fixedwing","name":"fixedwing","color":"009800"}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2016-10-23T21:57:23Z","updated_at":"2016-10-23T22:19:27Z","closed_at":"2016-10-23T22:19:27Z","body":"even thought all the mission were set to 50m ,px4 flew to ~2x50m which is also close to HOME_ALT+HOME_ALT (112m+112m) ,then decelerates to mission alt by setting throttle to 0 with sharp pitch,and lands 50m earlier than expected\r\nhere is the log file http://logs.uaventure.com/view/xqicBTPWS5LYtM4mXdtxSA"},"comment":{"url":"https://api.github.com/repos/PX4/Firmware/issues/comments/255618665","html_url":"https://github.com/PX4/Firmware/issues/5739#issuecomment-255618665","issue_url":"https://api.github.com/repos/PX4/Firmware/issues/5739","id":255618665,"user":{"login":"LorenzMeier","id":1208119,"avatar_url":"https://avatars.githubusercontent.com/u/1208119?v=3","gravatar_id":"","url":"https://api.github.com/users/LorenzMeier","html_url":"https://github.com/LorenzMeier","followers_url":"https://api.github.com/users/LorenzMeier/followers","following_url":"https://api.github.com/users/LorenzMeier/following{/other_user}","gists_url":"https://api.github.com/users/LorenzMeier/gists{/gist_id}","starred_url":"https://api.github.com/users/LorenzMeier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/LorenzMeier/subscriptions","organizations_url":"https://api.github.com/users/LorenzMeier/orgs","repos_url":"https://api.github.com/users/LorenzMeier/repos","events_url":"https://api.github.com/users/LorenzMeier/events{/privacy}","received_events_url":"https://api.github.com/users/LorenzMeier/received_events","type":"User","site_admin":false},"created_at":"2016-10-23T22:19:27Z","updated_at":"2016-10-23T22:19:27Z","body":"@dagar I don't see a bug here. The pitch tuning is bad (see the constant pitch rate offset) and consequently it doesn't pitch down as it should (see here: http://logs.uaventure.com/view/xqicBTPWS5LYtM4mXdtxSA#A_PitchRate_PLOT).\r\n\r\nI also think that min airspeed and trim airspeed are pretty high given the plane can't reach them at full throttle. To fix this, two things are required:\r\n\r\n  * Retuning the pitch control loop until it tracks pitch correctly\r\n  * Reducing airspeed min and trim or bolting a better engine on the system (or leave as is, but make sure the system is perfectly tuned, as it has not a lot of margin)"}}
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