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The September Equinox and Look at what I just found!

Sine and Cosine waveforms.

Today is an equinox, a day of the year when the length of of time between sunrise to sunset is equal to the time between sunset to sunrise and the sun is directly overhead of the equator. Here in the northern hemisphere it is the autumn equinox and nights will

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Triangles, The Unit Circle and Radians

The Unit Circle andRadian Measurement of Angles

This is the last of the basic math posts for awhile. The next posts will be about creating a flotation platform that can be used as a raft or floating dock. We will be using much of this math. This one is based around a video like

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A Right Triangle and an Introduction to Trigonometry

Basic Trig Formulas

I have just created another video about some basic math. This one is about what is probably the most useful branch of mathematics for practical work, trigonometry. I am not going to bore you here with a repeat of what is in the video, but what I will do here is

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Vectoring in on a Solution – Phasors

Graphical representation of phase and amplitude.

Mathematics is really a bag of tricks to try to represent real and actions a provides a way to calculate and predict things. Over the next 2 or 3 posts I am going to arm you with a new set of tricks. However, it will be necessary to

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Three is right for me.

3phaseHeader

Three blades rotated a random amount.

Three sounds like a strange number, but it turns out to be the perfectly balanced number when considering spinning objects. Most electricity is used to spin motors and almost all of it is generated by spinning alternators. Three phase is very common in electricity. Three blades are often

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Calculating the “Hinge Boom” on the crane.

The angle from the cables to the new frame.

In the last post about the crane, “Using CAD in initial design – More work on the Popsicle Crane“, we determined all of the angles necessary to calculate the forces on all the beams and cables. In this post I will calculate all those forces

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Capacitors and Alternating Current.

Rate of Change in a Sine wave.

One of the important concepts I hope I have driven home in the two previous posts about capacitors is the current in and out of a capacitor is related to how much difference there is between the source and voltage stored in the capacitor. We are going

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Parachute Cord and Popsicle Crane Analysis

Face View of the Spring Scale

I spent some time analyzing the good the bad and the ugly of the popsicle crane boom test and there was some of all three. The main problem was the parachute cord stretching but I also did not have the angles I thought I did. First, the issue

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Test 2 of the Popsicle Crane Boom.

The crane boom.

Last night I tested the crane boom and the video has been published. The boom did a great job. The cables did not. I used paracord for the most stressed cables and it turns out that paracord is very elastic and I was not able to maintain the angle of the

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Putting the Head on the Crane Boom.

The Crane Boom is almost complete.

The crane boom is almost complete! I put off doing the most difficult part, the head or nose of it until last. The reason this part is the most difficult is it narrows in both directions. The base or butt assembly did not get any narrower across the

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