Three-Pendulum Harmonograph (#1)- an automatic drawing machine

12/27/2010

Ladies and Gentlemen, you will like this. Here is a harmonograph in MS Excel 2003 which models a real one build by Karl Sims. Watch the video first to know what to expect. I could have built it from the bare drawing equations but that would have been too easy and no fun at all so I tried to model the real mechanism with 3 pendulums and the linkage rods. It…

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Day and Night Over the Atlantic – an example of sprite animation

12/22/2010

Hi guys, here is an animation I made yesterday by downloading 120 pictures of the Earth taken 12 minutes apart by satelites above the equator at 30 degrees longitude west on 10/01/2010. The pictures are 500 x 500 pixels and they are pasted as a background of a chart by a slimmed down VBA macro. You can change the speed of the model. The time increment is fixed however at 12 minutes…

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A Speedometer in Excel

12/18/2010

Here is a speedometer in Excel 2003. It’s an old file and the charting wasn’t done in the most economic fashion. I used too many series while I could have consolidated a lot of the dial curves. It is still a good example of animation and displaying custom numbers on a chart. There are two VBA macros involved, one for changing the speed value and the other for randomly changing the…

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Drafting an RC Flying Wing in Excel

10/01/2010

Hello everyone, I’ve been into flying wings since 2000 when I bought a Zagi online. As piloting style I can compare a flying wing to a snowboard ->> COOL. After abusing it greatly, I ended up mounting a couple of small Russian Norvel glow engines on it and eventually I had to bury it, since it became a pack of crumpled styrofoam. In 2005 I built another wing out of packaging tape and  foam (see below). I’ve been dreaming of a build-up…

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