Gert-Jan Rodenburg

Most commented posts

  1. Trimming helped! — 4 comments
  2. Props, charger, nuts & bolts — 3 comments
  3. Second brain finished. — 3 comments
  4. Motor Controllers — 2 comments
  5. Quadcopter pt. 2 (retro-post) — 2 comments

Author's posts

Saturn Baby!

So there she is, my first capture of Saturn. I could use some optics between my camera and the telescope to enlarge the total area of sensor used, because it still is only a very small dot. But alas! The rings are visible (or should I use singular as it appears to be only one …

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First Light, Orion Nebula

A couple of days back we had a clear night. So out came the telescope, and the first efforts to get the thing aligned and tracking right commenced! Orion was the target, and after having made a single 10 seconds exposure and seeing Orion appear on the screen of the camera I was dancing around …

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Bought a telescope

So… after having had a dormant interest in astrophotography I took the plunge. Bought a second hand telescope and mount. Let the skies be clear and the nights be cold. Ehrm, not too sure about that last part.   Details: Orion 200 mm F4.9 Newtonian reflector Celestron CG5-GT  

True Barefooting?

So… I started running again, and not without success as it seems. Within a couple of weeks I managed multiple 10K’s in just over the hour (first one: 1h 12min, second one: 1h 4min, third one, a one hour run landed me 600 meters short of the 10K). All of this in Vibram FiveFingers Sprints. …

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Running again

So, I turned 39, midlife crisis hit me like a freight train 😉 and I decided to start moving around somewhat more than I had done the last year. Out came the Vibram Five Fingers, Runkeeper on the iPhone and off I went. Five training sessions later I already hit two of my targets, and …

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On tools, the universe and the LHC

Long time. So update. Upon my realization that, in this space-time continuum it would be forbidden by some quantum effect to drill two holes on the opposite side of a piece of tube (my own personal versions of the elusive Higgs-boson), it was time to get some tools that would enable me to, at least, …

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If you build it like a tank…

OK, Long overdue update since the last ‘almost ready to fly’ post.The craft was almost ready to fly, and it has flown. With only one caveat. Repeat after me: If you build it like a tank, it will fly like a tank. And tanks don’t fly all too well. Weight, weight, weight, weight, those are …

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Almost ready to fly

Well, that was a productive weekend! The second quad, is almost ready to fly. I decided to try something I saw somewhere in a forum, and that is mounting the motors not on top of the arms, but below them. The reasoning behind this is that a propeller can suck air from anywhere it wants, …

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Motor mounts done

Small update. I finished the motor mounts. Where at first I tried with the same plastic material as I used for the center part of the frame, I now opted for some more aluminium. The result is quite acceptable I think. It also turned out that the frame is quite straight. With all four engines …

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A frame is born

Building of a frame commenced. The basic idea is to use materials readily available from hardware stores, so that in the event of a tree, a head or Planet  Earth intersecting with the flight path, things will be quite easily replaced, at least the frame will be one less thing to worry about. At the …

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