#### Introduction to Numerical Methods – Basic Filters #1

22/10/2010

This post shows the steps for building a first model of a single pole RC low pass filter (LPF) in Excel based on numerical solution using the finite difference method. It is quite elemetary to undersand, try to go through the proof regardless of your background.

#### 3-Body Planetary System with Options

08/10/2010

Here is a 3-body system with 3D graphics. I made it about 2 years ago but I’ve been updating it lately. This model  works at about 30 frames/second in Excel 2003 on a modern PC. In Excel 2007 it will run 10-15 times slower. I know 2010 is a lot faster than 2007. I’ve just bought a legit copy from<technicallysolutions.com> for 50\$ but I didn’t have a chance to install it yet. I need to add  few more…

#### Drafting an RC Flying Wing in Excel

01/10/2010

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…

#### Creating Shapes on a 2D Scatter Chart

01/10/2010

This post shows you how to draw a closed polygon (in this case a triangle for simplicity) on a 2D scatter plot in Excel 2003. 1. For this you need to sketch what you want to draw on a paper or just create a mental visualization. 2. In this sketch you need to define the vertices (corners) of the shape and figure out the approximate coordinates. 3. Create a table…

#### Dynamic Lissajous Emulator

01/10/2010

This is a dynamic Lissajous emulator in the sense that the waveform is obtained by combining 2 time varying sinusoidal waves with different frequencies.