But honestly, in my experience, it's not going to be a problem for an experienced pilot. Even if there's magnetic interference your drone shouldn't change altitude (lower) so at some point you should get control back. I don't know what's involved in "mapping" exactly, but if you can do it all from higher than 80' (30' or more above the towers) I don't see a problem. What do you think about flying around a substation? The highest towers are around 50'. You seem to know some of the technical issues involved with high voltage. I have an opportunity to do some mapping of an electrical substation. Literally anyone who takes off in a neighborhood is close to power. If you have buried utilities they are absolutely closer to you than overhead power lines and the earth does not stop magnetic fields. Keep in mind that everyone has power lines close to you, assuming you are near any electricity. I regularly fly within 2 or 3 meters with no problem. So compared with Earth's 450 mG field, the 30 mG you get from a power line is pretty much in the "noise" of the compass measurement.įor a power line, you get up around 30mG if you are landing on top of it. The Earth's magnetic field on the surface is variable, but never goes lower than around 250 mG (all the way to 650 mG or so) and in the US a general number is 450 or so depending on how far north you live. There is a lot of complication, but even as close 20m, you're only going to experience ~30 mG (milli-Gauss) of magnetic field. Transmission lines can carry upwards of 500kV. The picture you showed are transmission lines (as opposed to power lines, which are the ones on wooden poles that have the transformers on them used to supply houses and other buildings). Power lines are more dangerous as obstacles than they are magnetic generators. Aside from the magnetic field the EMF can interfere with your GPS reception.įor big transmissions lines stay as far away from them as the towers are tall. You should avoid flying below them for sure. This means the magnetic field parallel to the lies is weaker than the field directly under them. That would actually never be something you should try.įinley, there will always be more than one transmission line. Magnetic fields drop off with an inverse-square effect so if you fly very close (within 5 meters) to a transmission line, you're starting to get into more complied territory. So compared with Earth's 450 mG field, the 30 mG you get from a power line is pretty much in the "noise" of the compass measurement.įor a power line, you get up around 30mG if you are landing on top of it. The Earth's magnetic field on the surface is variable, but never goes lower than around 250 mG (all the way to 650 mG or so) and in the US a general number is 450 or so depending on how far north you live. There is a lot of complication, but even as close 20m, you're only going to experience ~30 mG (milli-Gauss) of magnetic field. The picture you showed are transmission lines (as opposed to power lines, which are the ones on wooden poles that have the transformers on them used to supply houses and other buildings). If this seems too much of a risk at the moment, then keep your bird on the ground for now and wait. I say fly and fly in "baby steps" with the utmost caution. There are so many questions right now about the "failures" that have been reported that I'm not ready to lay money on "magnetic interference" or "Power line noise" or anything else at this moment. I also feel it SHOULD be able to fly up to and between those same lines without issue, but I would never recommend it or try it myself. OP, I'm not sure what the answer to your question is, but I believe the Mavic SHOULD be able to fly i the area you are looking at without any issues. The book says not to fly near power lines because it is a liability issue to keep you from suing when you fly INTO a power line and destroy your Mavic. I'm certainly not advocating that you go fly under them or between them, but 50 feet, 100 feet away is VERY reasonable, depending on the other surroundings. If the Mavic can't handle flying "within eyesight" of power lines, there is a problem. Heck, you can't even get 500 feet ABOVE power lines, so why would you not consider 500 feet to be "away"? Try getting 500 feet away from ALL power lines in an area that is not rural and tell me how you do. What do you consider to be "away"? 500 feet is pretty far away from power lines. Why risk if you can avoid the problem? It's always recommended stay away from these!!
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