First attempt at kite aerial photography

by Dan Prosser
(Maryland, USA)

The KAP rig

The KAP rig

Today was my first attempt at kite aerial photography (KAP). The winds were a bit questionable all day; probably enough to fly my big ripstop Dopero, but without much extra to spare for weight lifting.

By the late afternoon, there seemed to be a decently steady breeze of about 8 mph, so I decided to take it and the brand new picavet rig I had just completed down to the local park.

Before talking about the flight, let me describe the KAP rig itself. It is made mostly out of 3 mm plywood and designed to lift a cell phone or small camera. The pitch angle of the rig can be adjusted from 0 degrees (looking straight ahead) to 90 degrees (looking straight down) in 22.5-degree incrememnts, and the yaw angle from 0 to 360 degrees in 45-degree increments. Once you settle on the desired angles, some toggles made out of 3/16" dowels hold it in place. I set it at 22.5 degrees down for the first flight. I am using an old cell phone with an app called OpenCamera, which provides an intervalometer function and can fix focus to infinity. The whole rig, including the phone, weighs less than a pound.

The very first attempt at flight was "interesting." I first flew the kite for about a minute just to make sure the bridle was adjusted correctly. Then I set the kite in the grass standing up and ready to be pulled into action, unwound about 40 feet of string, and attached the camera rig about half that distance from the kite. I started the camera (or so I thought) and gave the line a firm tug to pull everything up into the air. The picavet rig swung wildly as I ran backwards into the wind, letting out line as I went, trying to gain altitude. That's when I found out that, apparently, the bridle point was too high for KAP work. The extra weight of the rig pitched the nose of the kite down whenever there was a strong tug on the line, causing it to lose lift and start fluttering back to Earth. After a couple cycles of this, I decided I'd better land and adjust the bridle. As it turned out, I was fortunate, because for some reason the camera had taken only one picture and then stopped! It would have been a bummer to do a whole flight only to realize no pictures had been taken in the air.

After moving the bridle a couple inches towards the tail and trying to launch again, the flight behavior was much better. Getting it up into smooth air was still a bit of an adventure, as the camera rig tends to destabilize the kite, but after running the whole length of the soccer field, it was up well above treetop level at an altitude where it could be controlled with just the winder! This time the camera continued to take pictures of the park and nearby town.

Bringing the whole thing down wasn't too hard, since the wind wasn't that strong. I found that it worked well to walk towards the kite while winding it in, which reduced the tension and also gave more room to back up again in case I should need it. Once the kite got below treetop level, things started to get a little interesting again. I should have just let it settle down gently once it got down to 50 feet of line left, but I kept winding it in, only to pull it to a higher angle while simultaneously losing lift. At that point, control was lost and the camera rig came swinging down and stopped on the grass after a couple cartwheels. There was no damage, but like I said, it was interesting! Something to learn from for next time anyway.

Next time I will also add some more line (since the legal limit for altitude is 500 feet here, and it definitely didn't reach that with the 500 feet of line I brought), and maybe get a better camera, since this old phone doesn't take the best pictures. I've attached a few of the pictures that came out the best, along with a picture of the rig and the kite + rig in the air as seen from the ground.

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Aug 03, 2020
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Bridle position
by: Dan

Ian,

I am using an app called Open Camera on Android to take pictures automatically. You can set an interval and number of pictures (including unlimited) and it will keep taking them. It also can fix the focus to infinity so you're not relying on the autofocus. It is pretty nifty to be able to turn any old Android phone into a KAP camera.

Regarding the bridle position, I haven't done any math and physics to back this up, but I think that the closer the camera is mounted to the bridle, the more it will change the bridle angle and therefore the bridle position to maintain stable flight. I had it mounted very close to the bridle, partly because it made it easier to get into the air with my chosen launching method and partly because I wanted pictures from as high as possible. You may be right that the wind speed comes into play too. At less than a pound, the rig doesn't seem that heavy, but it is heavier than the kite itself.

Aug 03, 2020
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Good photos
by: Ian

Your photos turned out well. Does the phone have an auto photo setting? I'm surprised that the extra weight changed the bridle position so much. Maybe it's just the light wind. Dopero looks good.

Aug 02, 2020
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Nice work
by: Tim P.

Not a bad effort at all for a first go! All the best for more KAPing and the seeking out of interesting aerial landscapes...

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