Freesteel Blog » Triangles come in to land

Triangles come in to land

Wednesday, March 11th, 2015 at 3:35 pm Written by:

In spite of being up to lots of things, I’ve not been very interested in blogging of late.

I got my first flight of the year — a 3 minute top-to-bottom that began with a nil-wind terror swoop on take-off, followed by my almost forgetting to unzip the harness on landing due to being distracted by the sight of ducks paddling around in one corner of the water-logged field.

landingshadow

Here’s the data stream from the landing.
landingdata
Vertical lines at 5 second intervals. Yellow for barometer (air pressure rises as I descend), red for airspeed, cyan for GPS ground speed (seeming to correspond), white accelerometer pitch measurement, showing the pathetic flare coming into landing when all the speed drops off. The previous hump may correspond to the final approach turn (you have to push out to tighten the turn to a turning circle of about 35metres).

takeoffdata
Here’s the take-off sequence, with a slight push-out which was not held long enough, so I dropped very fast. The yellow for the barometer briefly goes below the starting value showing that at one time I got a bit of lift and could have been almost half a metre above take-off.

All in all, quite disappointing, but I’m glad to have some data to work with from my electronics device. I’m going to really appreciate the next flight when I stay up for a bit.

hgelectronics
Oh yeah, here’s a close-up of the one corner of my dog’s breakfast electronics project.

boxprinting
Luckily, 3D printers can print anything — including the abominable box I’ve “designed” in OpenSCAD to cram that electronics stuff into.

machtooldoes
Meanwhile, all this will probably be shelved due to this widget showing up in the hack-space this lunchtime. More later.

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