Moose vs. quadcopter

First of all. If you want to know what I’m up to next, follow me on twitter: @eirikso

So, I posted this video on YouTube two days ago:

And it have gone completely viral. It was made in a hurry and leaves a lot of things that might need an explanation.


The place and the moose

The video was shot just outside of Oslo. We have a lot of moose roaming around the woods here in Norway. And some of them very close to the city. They’re shy of people, dogs and other living creatures, but are pretty used to the sound of cars, trains, helicopters, planes etc. To see a moose is not very uncommon in Norway.

This moose is probably a 1,5 year old female. She seems more curious than afraid. And we spotted her again from far up in the sky later. Still calmly walking around eating in the same wood.

The technology in general

One of my hobbies for the last year have been to build and fly multirotor helicopters. When I fly them I do it either by flying Line-Of-Sight (LOS) or First Person View (FPV). When flying LOS you simply take off and fly the thing around while watching it from the ground. For quadcopters this limit the range because the copter is symmetric and you loose the orientation pretty fast. However, as I’ve gained experience you start to feel the direction based on speed and the way you control the copter, making it possible to fly further away. I fly LOS when I want to do acrobatics and train accuracy and pilot skills. Here is an example of some acro flying with a very small quadcopter:

KK2 Acro FLights from Eirik Solheim on Vimeo.

But for the video with the moose I fly FPV. Meaning that I have a dedicated camera connected to a video transmitter on board the copter. I feed the video signal into a pair of video goggles and navigate the copter like I was sitting inside it. Based on the video signal. When flying this way I always have spotters beside me that keep an eye on the copter and what is happening on the ground.

In addition to the goggles I have a screen and a digital recorder on the ground station. That recorder also has a mic and records the audio from the spot where we are standing. Ensuring that we got the recording of the quite enthusiastic spotters and my rather nervous comments about battery status and the fact that it is darn difficult to navigate this thing between and under the trees.

The camera

On the copter there is also a GoPro Hero3 to record HD video on board. The video downlink is only SD-quality. In the video I cut to the footage from the DVR at some points to show how it looks from my goggles. Here’s a screen shot from that feed:


You can see the battery status in the top left corner. We spotted the moose at the end of my flight. At 13,2 volts the batteries will be harmed and the copter will descend automatically or simply crash.

Because the HD footage is done in the GoPro on board the copter it was pretty important for us to get it back in one piece. On this copter the GoPro is mounted “naked” without the water proof box. To save weight and make the mounting easier. So I don’t want to crash it in the snow.

The recording in the GoPro is 2,7 K @ 25 FPS. It is slightly stabilised in FCPX and rendered at 1920×1080.

The camera is mounted on a vibration dampened platform under the copter.


The details

The copter I use here is this one.

It is a quad rotor helicopter. Based on a X468 frame that makes it possible to wrap it together for easy travelling. It is controlled by a DJI Naza flight controller that has gyros, accelerometer, barometer and GPS to assist the stabilisation of the copter.

I am using an old Futaba 9C remote with FrSky Tx and Rx modules.

After my previous post about the copter I have changed to three blade, nine inch props (9x5x3). They give me less jello and vibrations in my recordings. In general I find it easier to get rid of vibrations with smaller props running at higher speed. So I run the copter on 4S batteries. Usually two 2200 mAh in parallel. That gives me up to 12 minutes flight time with GoPro and FPV equipment. But 12 minutes is with completely new batteries and when I am pushing the limit. Usually I fly around 8 minutes and land when my batteries are close to 14V. In this video I push it all the way down to 13,2 V when I land.

I have also changed the ESCs on the copter. From Turnigy Plush that I mention in the article about the copter to HobbyKing F30A with SimonK-firmware. That change made the copter way more stable.

Sony RX100

I am also flying this copter with a Sony RX100. It is heavier than the GoPro, giving slightly lower flight time. But the RX100 has excellent image stabilisation built in and you get rid of the GoPro fisheye-look. Here is a RX100-video from the same copter and same area.

The dangers

Multirotors can be dangerous. The props are spinning fast. And they might cut your skin if you get too close when they are running. On my copter I have pretty soft and cheap GWS props. They’re not as dangerous as the carbon reinforced props that many people use. But if you are flying high the pure weight of the copter is dangerous if it falls down. And they do. That is why we are flying outside of the city over fields with no people. And always have spotters on the ground when we fly FPV.

The lipo batteries are very powerful. And can explode or catch fire if they are damaged.

In addition to this there are rules regarding remote controlled devices. They are different in different countries. In Norway you can fly up to 400 feet. And you need a special license to be allowed to put a camera on anything that flies.

If you want to to professional AP work you need an extra license from the civil aviation authority.

The fun and the problem

Lots of people immediately say “I want one” when they see how fun this is. And I can really recommend this hobby. But you need to be patient. First of all it is very difficult to fly these things. It has taken hours and hours of training to be able to fly the way I do in this video.

And even more hours fixing the broken copter after crashing. That is why I build them myself from the ground up. For the first couple of months I never returned with empty batteries. I always returned with a broken copter.

RCgroups is one of the best recourses if you want to start. If you are Norwegian I can recommend our build log over at

To start training I can really recommend this small and harmless copter: WLtoys V929. It is a toy, but it is four channel and is controlles just like the bigger copters. If you learn to fly this thing it will be easier to fly bigger and more dangerous copters.

Moose vs. quadcopter

My presentation from the Open Video Conference

I recently visited New York to attend the Open Video Conference. I was invited to take part of a panel discussing Public Media, Open Content, and Sustainability. But I also did a presentation during a session of lightning talks.

(No, Mr. Arnesen. This image is not HDR. It’s 5D Mark II + 15mm f2.8 fisheye + DXO Opticts pro + Lightroom, Photo: Eirik Solheim / licensed under a Creative Commons Attribution-Share Alike 3.0 Norway License.)

I had 7 minutes giving an example from one of the Norwegian Broadcasting Corporation’s experiments using YouTube and added some general thoughts on why we need to be the best provider of our content.

If you have attended any of my presentations during the last year or so this is known material. With only 7 minutes available I decided to put together some proven and tested stories. The story of Heinrich Stammler and a quick use of my now pretty well known image of a certain park in Oslo.

Martha Speiss recorded the presentation. You find it embedded below.

The Open Video Conference was an excellent event with lots of interesting sessions and huge amounts of brilliant people. They’re in the process of making everything available at the OVC web site.

My presentation from the Open Video Conference

Register more than your domain!

I just finished a post (norwegian) about the fact that we registered the name of our Norwegian Broadcasting Corporation tech blog “NRKbeta” on a lot of social networks and places around the web. We did that the second we decided on that name for the blog. And I think that is becoming an important part of your marketing strategy.

I try to be pretty fast on registering “eirikso” on the different services popping up around the net. You never know who’s gonna strike big, and right now it is quite nice that addresses like, and takes you to stuff that I am in control of. Eirikso is my brand on the internet. If you try the same with NRKbeta we’re there as well.

So let’s do a quick test. If you happen to make very nice sports cars you might want someone that visit to find something else? And Microsoft on Flickr? Probably not extremely important, but as big web sites become huge services and places where we spend a lot of time this is getting important. The second race for domain names. At this point…whatever company… isn’t close to the importance of http://www…whatever company… but it is getting more important as these giants grow.

And, if you decide to go out there and register your company just to reserve the space, then please put something honest in there. Register at twitter and simply post one single update. “Company nn has registered this user. It’s currently not in use.” or something like that.

My former place of work, the american consulting company called Accenture seems to have done something like that: Or have they? I don’t know if this is Accenture or just some dude that has registered that user. And that last twit is just plain stupid. You’ll never get any feedback by simply registering a user on twitter and start screaming “anybody out there?”. And my guess is that some clever people at Accenture have registered this one as well. And they don’t have to use it. But at least put in one video and a quick message. Same as for twitter. “This is the official YouTube channel for Accenture. It’s currently not in use.”

And please. Don’t bring back that horrible “under construction”-gif from the late nineties! Register to reserve the space. If you’re going to use it, do it properly, if not be honest and tell people it’s not in use.

Do you have any nice examples of profiles that should have featured something else? Like Porsche on YouTube?

Register more than your domain!