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Spark gone rogue...fly away
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<blockquote data-quote="NikTheBuilder" data-source="post: 119430" data-attributes="member: 21018"><p>Hi, DJSparxx.</p><p></p><p>I'm no expert at this, so others may have a better read on the files than I do, but I'm interested in being able to understand these so i thought I'd have a look.</p><p></p><p>If I'm seeing this right, the log file shows takeoff 82 seconds after power-on, ascending up to around 45' above take-off. Then, at 102 seconds, it accelerates from 6mph to 20 in 0.12 seconds. That's over 5g in acceleration, which seems pretty fast to me - way faster than the wind speed could cause. Again at 105 seconds, another 5g+ acceleration, followed by a smaller (but still rapid) deceleration at 106 seconds. This might be hitting a power line on the back of Durfee Ave just before it crosses Walnut avenue.</p><p></p><p>The battery was still at 98% when the flyway occurred, and at 91% when the a/c finally came to rest on the roof.</p><p></p><p>GPS was good, with 18 satellites, and the home point was set. It looks like the home point was on some old railway tracks - does that amount of metal not interfere with the compass? </p><p></p><p>[ATTACH=full]13598[/ATTACH]</p><p></p><p>The .txt log file may have more data(?); I've passed this one through AirData to convert to CSV and then uploaded that to the Phantomhelp.com viewer linked above.</p></blockquote><p></p>
[QUOTE="NikTheBuilder, post: 119430, member: 21018"] Hi, DJSparxx. I'm no expert at this, so others may have a better read on the files than I do, but I'm interested in being able to understand these so i thought I'd have a look. If I'm seeing this right, the log file shows takeoff 82 seconds after power-on, ascending up to around 45' above take-off. Then, at 102 seconds, it accelerates from 6mph to 20 in 0.12 seconds. That's over 5g in acceleration, which seems pretty fast to me - way faster than the wind speed could cause. Again at 105 seconds, another 5g+ acceleration, followed by a smaller (but still rapid) deceleration at 106 seconds. This might be hitting a power line on the back of Durfee Ave just before it crosses Walnut avenue. The battery was still at 98% when the flyway occurred, and at 91% when the a/c finally came to rest on the roof. GPS was good, with 18 satellites, and the home point was set. It looks like the home point was on some old railway tracks - does that amount of metal not interfere with the compass? [ATTACH type="full"]13598[/ATTACH] The .txt log file may have more data(?); I've passed this one through AirData to convert to CSV and then uploaded that to the Phantomhelp.com viewer linked above. [/QUOTE]
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Spark gone rogue...fly away