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Old Mar 07, 2014, 12:18 PM
Flying a recreational vehicle!
Flying Pitcher's Avatar
Greenland, Qaasuitsup
Joined Apr 2013
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Idea
4axis gyro! collective controller.

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Old Mar 07, 2014, 12:47 PM
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Kauai
Joined Jan 2011
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Quads use Baro for altitude hold,most quad flight controllers can be setup for helis(at least some list heli settings).Gps altitude hold can vary +\-100 feet or more so not accurate enough.
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Old Mar 07, 2014, 12:50 PM
Cranky old fart
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Germantown, WI.
Joined Oct 2007
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I don't think you have thought this through. Just what would this additional gyro measure, that it could compensate? A 3 axis gyro already measures pitch, roll and yaw. There is no 4th axis. Accelerometers measure change in attitude, barometers measure change in altitude, magnetometers measure change in heading and GPS measures position. Without those "fancy barometric control devices" you have nothing to measure.
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Old Mar 07, 2014, 04:54 PM
Flying a recreational vehicle!
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Greenland, Qaasuitsup
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Old Mar 07, 2014, 11:16 PM
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It sounds reasonable. It would have to have an extra accelerometer I suppose, or maybe combine existing accelerometers. It's probably been done, but I've never heard of it.
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Old Mar 08, 2014, 11:30 AM
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United States, NJ, Manville
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I think you have to read what Barl said again....Maybe he confused you with the attitude thing.....I think the better way to say that a Accelerometer measures a given enertia on an object....A barometer measures air pressure which changes when altitude changes.....
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Old Mar 08, 2014, 12:19 PM
Flying a recreational vehicle!
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Greenland, Qaasuitsup
Joined Apr 2013
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Old Mar 08, 2014, 12:32 PM
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Quote:
Originally Posted by Flying Pitcher View Post
well, i'm not talking about total altitude hold, but rather keep those spikes from happening during gusts of wind where the accelerometer just trims collective a little to keep it from jumping up and down..
That's what I thought you meant also. There is probably a reason it is not done, probably issues with dampening collective or it's not really necessary.
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Old Mar 08, 2014, 12:43 PM
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Denver, CO
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A regular gyro needs rotation, so its out. An accelerometer would eventually get confused by having to track the motion, and by g-forces. So something else is needed.
A barometer, laser altimeter, optical devices, sonar, and GPS are things I know have been used. Sometimes a combination of devices, since each has its drawbacks.
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Old Mar 08, 2014, 01:20 PM
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United States, NJ, Manville
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Accelerometers and Gyros do not detect changes in altitude....GPS alone does nothing and needs feedback from satellites to measure altitude change.....A Barometer detects changes in air pressure which happens when an object changes altitude......The Naza H uses all 4 sensors...You can use 3 excluding GPS and still keep altitude.....They make chips with both Accelerometers and Gyros on the same chip so why not use that chip and a Barometer to be more accurate ?...
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Old Mar 08, 2014, 02:20 PM
Flying a recreational vehicle!
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Greenland, Qaasuitsup
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Old Mar 08, 2014, 03:03 PM
Cranky old fart
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Germantown, WI.
Joined Oct 2007
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Try the DJI Naza H. Or, buy a mulitWii flight controller board.
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Old Mar 08, 2014, 04:55 PM
Flying a recreational vehicle!
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Greenland, Qaasuitsup
Joined Apr 2013
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Old Mar 08, 2014, 04:58 PM
Cranky old fart
Balr14's Avatar
Germantown, WI.
Joined Oct 2007
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A multiwii board with everything but GPS sells for about $50. But, it requires some fair mount of effort to use it. What you want has been done with these boards.
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Old Mar 09, 2014, 01:00 AM
postcounts are meaningless
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Joined Feb 2014
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Just took a drive to Astoria OR (right at the mouth of the columbia river and pacific ocean).
As we started down the hill into town, the Garmin said we 427 feet above sea level. I'm thinkin' that's about 200 feet too high, but not 100% sure. On the way home, at the top of the same hill, it said we were 42 feet BELOW sea level.
Gotta go with Kauaiguy
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