More about the Wind Machines

A few new videos.

Back in April 2015, I blogged about the wind machines commonly used for frost control in the Wenatchee Valley. Resembling tall fans, different versions of these machines can be found in agricultural areas throughout the west wherever frost — especially early spring frost — is an issue. Around here, they’re often in low areas subject to thermal inversions.

Wind Machine
The wind machines that were running this morning. That’s the Mission Ridge Ski resort in the background. Photo shot with my Mavic Pro.

The machines are fans that generate wind. The blades spin fast — faster than you might think watching the video below — to circulate the air. The fan heads rotate to constantly change the direction of the wind. The net result is that the air is circulated, bringing warm air from above down into the crops.

In the almond orchards of California, they use helicopters to do this. I think it’s because the orchards are so big that they simply can’t install and maintain as many wind machines as they need. The helicopters are likely a lot cheaper in the long run, especially when you have a few years in a row when they’re not needed. I’ve been on frost control contracts for the past five winters now and have yet to turn a rotor blade over an almond tree. (Global climate change?)

This winter was particularly long, setting the tree fruit back two to four weeks. The cherry trees are still blooming around here; last year, the cherries were already beginning to redden in the orchards closest to my home. Nighttime temperatures at my home have been in the low 40s. But in the orchards below me, pockets of colder air form. And this morning, they got cold enough to trigger the temperature-set auto start feature on the wind machines in the closest orchards.

I don’t know exactly when they started. I was up at 4:30, reading before getting out of bed, and I didn’t hear them. But by the time I made my coffee at 5 AM, I could hear them faintly through the walls and windows of my my home. I stepped out on the deck for a better look in the predawn light. The sound was louder and I could see two of the machines to the west spinning. My ears told me that one to the northeast, which I can only see from a handful of spots on my deck, was also spinning.

Here’s the zoomed in video I shot with my phone. When I shut up, you can hear the wind machines.

I did a Periscope — that’s a live Twitter video — of the wind machines. A handful of people tuned in and I answered questions as they came up. I was frustrated that I couldn’t zoom in. I signed off, used the video feature on my phone to capture a short zoomed-in clip, and posted it on Twitter. Then the sun rose and the light got good and I did another Periscope that was mostly to show off how beautiful the area was. The wind machines droned in the background of my voice as I described various things and answered questions.

I went inside, washed some pots from cheesemaking, and listened to the radio. I could hear the wind machines faintly through the walls and windows. I was sort of bummed out that I couldn’t give people a better view.

And then I remembered my Mavic Pro.

It took only two or three minutes to set it up. I launched it from my deck, got the video camera going, and sent it to the wind machines, stopping before it got so close that the wind could affect it. The light was beautiful and the image the Mavic sent back to me was clear. I hovered for a while to capture a good clip and then flew around a little, just taking in the view with the camera running. I stopped the video camera, took some stills, and then flew home for some more video of my home and the area around it.

Back inside, I made a fresh cup of coffee and spent a few minutes editing the video and setting it to music. It’s unfortunate that the Mavic doesn’t capture sound, but I understand why: it would be capturing its own buzzing sound, which isn’t pleasant. So music will have to do.

A side note here: I’ve been thinking a lot lately about how much I like living here. I realized — and I think I mentioned in one of those Periscope videos — that I like it here more than anywhere else I’ve lived. I’m not sure if it’s because of the place itself or the fact that I have a home with an amazing view built to exactly meet my needs or because after a stifling relationship that went on a lot longer than it should have I finally have the freedom to do what I want to do with my life and time.

Whatever the reason, I just want to remind readers that we all have just one life and it will eventually end. Don’t waste it stuck in a rut or in a place you’re not happy.

Mavic Pro Observations

What I’m seeing, liking, and not liking — so far.

Mavic Pro
The Mavic Pro, unfolded for flight. Although the manual says to remove the clear protective cover over the gimbal, I suspect it might be usable during flight — if it doesn’t fall off. I remove it.

I’ve had my new DJI Mavic Pro drone in my hot little hands for about four days now and have taken it on a total of five missions so far. (More on my use of the word “mission” shortly.) I’ve developed some definite thoughts about it, from the perspective of a pilot, photographer, videographer, and new drone pilot. I thought I’d take a moment to share them with readers who might be considering the purchase of a drone for photography.

And that’s a big part of what this drone is to me: it’s a tool for making photos and videos. While some people buy drones for the flying aspect of them and actually race them around obstacles, etc., I have no intention of doing that. (At least not yet.) And if you’re thinking of buying a drone for that purpose, I don’t recommend a Mavic, despite what the DJI website shows it capable of doing. I’m sure you can buy a less expensive drone that’ll be better for racing (and crashing). Do your homework. See what the other guys (mostly) and gals are racing and what they have to say about their equipment.

Portability

Folded Mavic
It folds up small.

The most obvious benefit to having a drone that folds up into the size of a one-liter bottle of coke is portability — and that’s the main reason I bought the Mavic. Its folded size is less than 4 x 4 x 8 inches.

The truth of the matter is, my friend Jim offered me a smoking deal on his DJI Phantom 4 because he was upgrading to a Phantom 4 Pro. Buying his gently used drone would have saved me a bunch of money. But the reality is that I travel a lot, often without a lot of space for baggage. The Phantom 4 does not fold up at all and although there are carrying cases available for them, they’re not easily brought on a four-month trip in a truck camper or with gear in the back of a helicopter or on a motorcycle. And don’t even think about taking a hike with one.

Although I bought the Mavic package that included a carry bag smaller than a shoebox that can fit the drone, the controller, at least two spare batteries, and a battery charger, I stopped using the bag on Day Three, switching instead to a very small backpack I’d bought around Christmas time for hiking. The DJI bag was a snug fit for the drone and I worried about damaging it as I crammed it in and dragged it out. The bag is surprisingly bad design for a drone that has an amazingly good design. If you are considering the purchase of this bag, I recommend you skip it. If you want a padded bag, look for a small camera bag. (Or buy mine. It’ll likely go on eBay next week.)

With portability comes the question of durability. A Twitter friend asked me if it was durable. Are any of these things durable? I said no. But I also said it isn’t fragile. Later, in my mind, I equated it with the difference between those standard green David Clark aviation headsets (durable but kind of clunky) and Bose ANR headsets (not durable but lighter and sleeker). Neither will break if you handle them with care, but the Bose headsets are more likely to break if you don’t. The Mavic, of course, would be the Bose in this analogy.

And yes, it’s light. The drone, onboard battery, controller, and two spare batteries weigh in at under 2-1/2 pounds.

Design

I am completely blown away by the drone’s design. The way it folds up so neatly, the way the blades fold to make it even smaller, the way the micro SD card fits into the side, the way the battery is so well integrated with the drone’s body, the way the tiny camera lens and gimbal hang from the front — it’s all extremely well thought out and executed.

That’s the design for portability and flight. The design for actual use is a bit less rosy.

As a regular commenter on this blog pointed out in comments for a previous post this week, the Mavic sits very close to the ground. It only has two legs (on the front) and two little stubs on the back. That puts the gimbal mounted camera just inches off the ground. If you’re flying it from grass or from rocky terrain, that camera is going to be in the grass or bumped by rocks. And if there’s dust, that dust is going to fly on landing and take off (just like with a helicopter) and possibly get into rotor heads or gimbal parts. I had the foresight to order a foldable landing pad to operate from — this helps ensure a safe, clean environment for operations. But I also have to take care on landing to make sure it lands on the pad. Later, I picked up a 3 x 4 rubber-backed mat that I’ll likely wind up using in my garage when I get home. Until then, it’s an expanded landing zone when I travel with my truck.

The only real complaint I have about the design is related to the plastic clamp that holds the gimbal immobile during transport: I have a heck of a time getting that damn thing on. I assume I’ll better at it one of these days; I sure hope it’s soon.

Controller

The Mavic’s controller also folds up into a smaller package. It has a screen with general information about the drone’s status and the usual buttons and joysticks to control it. But it has no video monitor. Instead, you affix a smart phone running the DJI Go app (or another app; more on that later), to the controller. It has a moveable plug preconfigured for iPhone users, but also comes with other plugs for other smartphones. You plug in your phone and then clamp it into the controller. The clamp is tight and, miraculously, lets me keep the bumper cover I have for my phone on the phone. The phone is definitely not going to fall out. My only complaint, which is minor, is that I have difficulty tapping the home button since it’s partially covered by the clamp. I think that if I fiddle with it enough and experiment with different positions, I might be able to make that problem go away.

The controller and a smart phone work together to control the drone. I’m pretty sure you can control it without a smart phone, but I suspect it would be a lot more difficult, especially since you would not be able to see what the camera sees without the camera as a monitor.

There is a lot to learn about the controller and the DJI Go app. Yes, you can pick it up and fly it almost immediately with just a few pointers from a friend or a quick glance through the manual, but you will never master either flying or photography — which really do need to be considered separately — without reading the manual and trying various features until you learn what works for you.

My only gripe about the controller setup is age related: my older eyes simply can’t see the video feed on my phone as well as I’d like them to. Yes, I wear readers. And yes, I stand with my back to the sun to shield the screen from direct sunlight. But still, in monotonous terrain — like the desert where I’ve been flying lately — it’s sometimes hard to figure out what the camera is looking at. More than a few times, I sent the drone forward only to discover that it was pointing in a different direction than I thought it was. Oops.

User Guides

The User Manual — which is only available online as a PDF — sucks, plain and simple.

At 59 pages long, which includes the cover and a lot of pages that simply don’t provide any real instructions, it provides just enough information for someone knowledgeable about flying or photography to figure out what they need to do to fly and shoot photos/video. But if you’re a complete newcomer to either one and think you’re going to race around trees in a forest while filming exciting video sequences on Day One, you’re only fooling yourself. I’m constantly going back to it, looking up features I think should be available, finding bits and pieces of information, and then putting it all together to learn a new task. I’m thinking I might write up some task-based tutorials for myself and others who might need them.

The Quick Start Guide, which comes in a tiny booklet, has only 10 pages of information between front and back covers. The printed version has multiple languages in it, which makes it seem a lot larger than it is. It’s also available as a PDF with just one language. Again, if this isn’t your first drone, it’ll definitely have enough information to get you started. Otherwise, good luck.

Flight

Okay, this is where I’m completely blown away: the automatic features for flight are amazing.

While it is possible to manually take off using the joysticks — and my friend Jim taught me how to do this on his Phantom 4 — it also has an automatic takeoff feature. Tap a button and slide your finger across a confirmation screen, and the Mavic powers up and climbs to a four-foot, rock solid hover. It’s just amazing to watch, especially if you’re a helicopter pilot and understand what it takes to make such a smooth, solid takeoff in a helicopter. And yes, I understand that the aerodynamics of a four-rotor drone is different from that of a single main rotor helicopter.

Push the left (pitch/yaw) stick forward and the drone can climb straight up like a rocket at a maximum speed of 16.4 feet per second — that’s 984 feet per minute for us pilot types. Push the left stick right or left and the drone rotates. Pull the left stick backwards, and the drone descends at up to 9.8 fps (588 fpm). Helicopter pilots can equate the operation of the left stick to the collective (forward/back = pitch) and tail rotor pedals (left/right = yaw) on a helicopter, even though the stick controls different mechanical operations on the drone.

Push the right stick in any direction and the drone flies in that direction without changing the direction in which the nose (camera) is pointing. This is like a helicopter’s cyclic, although again, it controls different mechanical operations on a drone.

As you might expect, the farther you push a stick, the faster the drone moves.

Getting it airborne and actually flying it is remarkably easy — to a point. It’s precision flying that takes a lot of effort and practice. The drone acts immediately and rather abruptly to most control inputs, so if the video camera is turned on while rotating it or adjusting the angle of the gimbal, you can clearly see a sort of jerky response. Like learning to hover a helicopter, you need gentle control inputs. And that takes practice.

The Mavic has three modes for flying: Positioning (P), Sport (S), and Tripod. Most regular flying is done in P mode, which also has obstacle avoiding features enabled. If you want to fly faster and aren’t worried about obstacles, S mode is available with the flick of a switch on the controller. The difference in speed is about 20 miles per hour for P mode vs. 40 miles per hour in S mode. Tripod mode, which I hope to explore today if the wind isn’t as bad as forecasted, slows everything down, making it easier to get smooth video shots.

DJI Go app options make it easy to keep the drone from wandering off where it shouldn’t be. The very first thing I set was the maximum altitude — in the U.S. drones are limited to 400 feet AGL unless an FAA waiver is obtained. I also limited its distance, at least at first. While the Mavic’s dark color makes it easy to spot in the sky, it’s easy to lose sight of it if you take your eyes off of it while it’s moving. I recommend operating with a spotter whenever possible. I usually hear it better than I see it, unless I’m in a noisy environment. I do believe, however, that it’s a little quieter than Jim’s Phantom 4. They both sound like angry bees — and believe me, as a beekeeper I know exactly what angry bees sound like — but Jim’s drone sounds like more angry bees than mine.

I believe there are limitations built into the software that prevent operation near airports, but I haven’t been close enough to an airport yet to test that. If so, it’s a good feature that pilots should be happy about. (Now if only they’d limit climb to 400 in the software instead of making it an option. Out of the box, the Mavic has an operating ceiling of more than 18,000 feet, which is absurd.)

Landing the Mavic couldn’t be easier. Really. I use the automatic landing feature almost all the time. It eliminates the need to navigate back to the home base. Just tap a button and use a slider to confirm you want the drone to return to home. It immediately turns back to its starting point, climbs if necessary, and heads back at top speed (for its mode). You can watch the distance change on the controller. When it’s overhead, it might look as if it has passed the landing zone, but it hasn’t. It turns to the direction it was facing when it took off, then descends straight down. When it’s less than 10 feet from the ground, it might make some adjustments. At about three feet up, it pauses and then comes right down to the ground and shuts its engines. The whole time it’s doing this, the controller is letting out an annoying beep-beep-beep, displaying an option that enables you to take over. That’s because obstacle avoidance is disabled while landing and you might need to stop the auto land feature. I’ve found, however, that in good conditions with precision landing enabled, the Mavic lands exactly where it took off from. To me, that’s the coolest thing of all.

Photography

Tyson Wells from the Air
A view of Tyson Wells from the air, looking southeast.

The thing that changed my mind about drones, as I discuss in a blog post from December, is the quality of photographs and video — especially video — from drones. I’d seen videos from my friend Jim’s and I was hooked. They were, by far, clearer and steadier than most video shot from my helicopter. It was no wonder videographers were turning to drones. They could get better results for less money.

(I do need to point out again here that for aerial photo jobs covering a large area, you’ll definitely get the job done faster in a helicopter. As I mentioned in my December 23 blog post:

But another client needed aerial video and still images all along the Columbia River from Wenatchee to Chelan, then up the Wenatchee River to Leavenworth and up Lake Chelan to Stehekin. This was well over a hundred miles to cover and some of it was inaccessible by car. We got all of the shots in less than three hours of flight time. It would have taken weeks to get that footage with a drone — and even then, some of it would have been impossible to get.

So don’t give up completely on helicopters. Think about the mission before deciding on the tool.)

I’ll admit that it sort of broke my heart when I realized that the GoPro “nosecam” videos I’d been sharing were absolute crap compared to what I could get with a drone. If you can’t beat them…

So here I am with my own aerial camera — which is what the Mavic really is. It can do video with resolutions up to 4K, which is the default setting. I actually thought there was a problem with the camera when I tried to play back the video on my 5-year-old MacBook Air. The reality was that the computer simply couldn’t handle the amount of data in the video file. I’ve since set it down to 1090p, which is all I need, at least for now. The video is amazing: smooth and clear. I’ll let you see for yourself; if you can, view these in full screen at the highest resolution YouTube offers:


In this example, I’ve put the Mavic into a 200-foot hover at the edge of an outdoor sale event in Quartzsite, AZ. Hands off on the controls and it’s rock steady. I couldn’t do that in a helicopter.


I shot this video yesterday morning. I flew out at 150 feet and back at 200 feet. This is the return flight, which seemed to have a better angle, using Return-to-Home mode. At the end, you’ll see me standing with a retired guy I met who used to program robots for airplane manufacturing. Keep in mind that this is only a small portion of the thousands of people camped out in the BLM land around Quartzsite right now.

I have not experimented much with still photos. I get so caught up in the flying and video that I forget to snap photos once in a while. It can save JPEGs at 12 megapixel resolutions. I’m not sure if it can save photos while it’s shooting video.

The camera is completely adjustable for automatic and manual settings. Again, I haven’t experimented much with this yet. Just getting it to fly where I want has been enough of a challenge for the first three days of flying. And the manual leaves out too many details; it’s hard enough just to find the settings.

Missions

I’m teaching myself how to use the Mavic by creating “missions” for myself. A mission is a task I need/want to complete. Yesterday’s mission was to get video footage of the long stretch of desert near where I’m camped where so many other people are camped (see second video above). I wanted a nice record of the sheer volume of people dry camping here. I can repeat this mission in about a half dozen other places to get an even bigger picture of the weird situation in Quartzsite during the big RV show, but time is running out. The forecast calls for high winds today and the campers will start rolling out of here on Sunday.

Another mission is to video the activity around the RV show. That would entail setting up a point of interest in the middle of the show area and then flying the drone around it at a safe distance from participants with the camera continuously focused on the middle of the action. I’m hoping to do that on Saturday when the show is busiest. I might practice on a smaller scale with some of the camps around here first.

My goal is to understand what controls and settings to use to accomplish missions like these. I can then call upon what I’ve learned to complete missions for paying clients once I finish getting my commercial UAS pilot rating. I see drone photography as a component of the services Flying M Air can offer.

Ready to Buy a Drone?

My interest in drones seems to have sparked an interest in other people. I hope this blog posts helps them decide, one way or the other. In any case, I’m sure this isn’t the last you’ve heard from me about my Mavic Pro.

I do have a favor to ask, though. If you do decide to buy a drone and you want to buy from Amazon — which offers great prices and free shipping — please use one of my links. I get a tiny commission from sales that originate with a link from this site and I sure would appreciate the income to help cover my hosting fees.

How many mostly ad-free sites have you visited lately? Very few, I’ll bet. I guarantee that the folks who build and maintain them would similarly appreciate your support.

And if you’re interested in buying a gently used DJI Phantom 4, my friend Jim has one for sale — as soon as his Phantom 4 Pro arrives, anyway. I can put you in touch with him — but please, only if you’re serious. It’ll be a good deal, but he isn’t giving it away.

Fog & Sky Time-lapse

Probably the best time-lapse movie I’ve made so far.

A few weeks ago, we had an amazing day full of fog that drifted in and out for most of the day. It was a real joy to watch it from my home, mostly above the fog. But, of course, I didn’t have a camera set up for a time-lapse.

GoPro Camera Setup
I set up my GoPro on the deck outside my bedroom using a clamp mount my brother got me for Christmas last year. I have a USB power battery replacement for my GoPros that ensure I never run out of power.

Early this past week, the forecast mentioned fog for several days in a row. So I got out one of my GoPro cameras, put in a blank mini SD card, connected it to a full-time power source, and got it going taking one shot every 10 seconds.

That was on Monday afternoon.

Tuesday was a nice day. No fog. Not even much in the way of clouds.

Wednesday was kind of dreary with some clouds coming and going, but nothing really interesting.

Thursday was the same.

Friday was a bit more interesting, with clouds moving around a bit. I figured I could turn that into a time-lapse in a pinch.

But Saturday! Oh, Saturday, November 13, 2016.

Morning Clouds
This scene out the window beside my desk was my first inkling that it might be a good time-lapse day.

I was sitting at my computer finishing up a blog post about my home automation system when I happened to glance outside. My “office” window faces northeast. I see the Columbia River Valley as it narrows between cliff faces. And that morning, as it was just getting light, I saw the clouds clinging to the side of the cliffs near my neighbor’s house.

The fog was back.

I was almost afraid to see if the time-lapse camera was still running, but when it got light enough to see, I went out on the deck and took a peek. It was. Glad I’d bought that 64GB mini SD card.

I let it run. I went about my day, doing odd jobs at home and running errands in town. The camera continued to run. The fog came and went, the clouds moved around, it became a beautiful day. The wind kicked up and the clouds seemed to fly by.

And the camera continued to record an image every 10 seconds. All day long and into the night.

This afternoon, I shut off the camera and brought the SD card inside. I found the images starting at 6 AM and ending at 6 PM. I ran them through a batch action in Photoshop that cropped them to HD video size. I fired up QuickTime 7 Pro, which I have just for time-lapse work, and compiled the 4320 images at 6 frames per second. The result was too slow. I tried again with 15 frames per second. Perfect!

The result is what you see below.

Got five minutes? Take a break and watch my time-lapse. View it in full screen if you can.

If you’re wondering about the music, which seems to go perfectly with this video, it’s by Paul Avgerinos: Dance of Life from the album Sky of Grace.