{"action":"created","issue":{"url":"https://api.github.com/repos/cleanflight/cleanflight/issues/791","repository_url":"https://api.github.com/repos/cleanflight/cleanflight","labels_url":"https://api.github.com/repos/cleanflight/cleanflight/issues/791/labels{/name}","comments_url":"https://api.github.com/repos/cleanflight/cleanflight/issues/791/comments","events_url":"https://api.github.com/repos/cleanflight/cleanflight/issues/791/events","html_url":"https://github.com/cleanflight/cleanflight/issues/791","id":69235007,"number":791,"title":"Flight - Trim Drift Issue in Horizon and Angle Mode","user":{"login":"rscarawa","id":9462118,"avatar_url":"https://avatars.githubusercontent.com/u/9462118?v=3","gravatar_id":"","url":"https://api.github.com/users/rscarawa","html_url":"https://github.com/rscarawa","followers_url":"https://api.github.com/users/rscarawa/followers","following_url":"https://api.github.com/users/rscarawa/following{/other_user}","gists_url":"https://api.github.com/users/rscarawa/gists{/gist_id}","starred_url":"https://api.github.com/users/rscarawa/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rscarawa/subscriptions","organizations_url":"https://api.github.com/users/rscarawa/orgs","repos_url":"https://api.github.com/users/rscarawa/repos","events_url":"https://api.github.com/users/rscarawa/events{/privacy}","received_events_url":"https://api.github.com/users/rscarawa/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/cleanflight/cleanflight/labels/question","name":"question","color":"207de5"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":82,"created_at":"2015-04-17T23:02:55Z","updated_at":"2016-04-10T00:18:31Z","closed_at":null,"body":"I have noticed in the various releases (now in 1.9.0) that the quad drifts back and to the right.  I had seem this before upgrading and it took awhole lot of trim to get it to stay still.  Even after re-calibrating the accelerometer, that did not fix the issue.  Any idea why it seems to do this?  When it drifts, the quad is noticeably tilted in the air.\r\n\r\nIs there a tool readily available for me to read the black box logs?  SOmething that does not require compiling?\r\n\r\nhttps://www.dropbox.com/home/rc/cleanflight/1.9.0/Trim_Drift"},"comment":{"url":"https://api.github.com/repos/cleanflight/cleanflight/issues/comments/207890215","html_url":"https://github.com/cleanflight/cleanflight/issues/791#issuecomment-207890215","issue_url":"https://api.github.com/repos/cleanflight/cleanflight/issues/791","id":207890215,"user":{"login":"kevinjones4642","id":18371852,"avatar_url":"https://avatars.githubusercontent.com/u/18371852?v=3","gravatar_id":"","url":"https://api.github.com/users/kevinjones4642","html_url":"https://github.com/kevinjones4642","followers_url":"https://api.github.com/users/kevinjones4642/followers","following_url":"https://api.github.com/users/kevinjones4642/following{/other_user}","gists_url":"https://api.github.com/users/kevinjones4642/gists{/gist_id}","starred_url":"https://api.github.com/users/kevinjones4642/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kevinjones4642/subscriptions","organizations_url":"https://api.github.com/users/kevinjones4642/orgs","repos_url":"https://api.github.com/users/kevinjones4642/repos","events_url":"https://api.github.com/users/kevinjones4642/events{/privacy}","received_events_url":"https://api.github.com/users/kevinjones4642/received_events","type":"User","site_admin":false},"created_at":"2016-04-10T00:18:31Z","updated_at":"2016-04-10T00:18:31Z","body":"I suspect my drift is due to vibration, but the vibration does not appear to be due to poor prop balance, but rather to resonance in the frame at specific frequencies. I don't know how to fix this other than ditching the frame, but as the ImpulseRC Alien 6\" is a rather common frame, I'm assuming that many people do not have this problem. I was hoping others with similar hardware might have suggestions on how to fix it. I guess I generally fly in Acro most of the time anyway, so perhaps it won't bother me too much, but if the accelerometers are getting beat up by the vibration, most likely the gyros suffer noise issues as well.\r\n\r\nGuess I could look at motor balancing, but I have never needed to balance a motor on any multi-rotor before, and all four motors hit resonance here, at pretty much the same motor setting, so I'm not too keen on doing that. I have never even had to balance a prop on the smaller multi-copters before either.  "}}