Having fun with the first frame (and some expensive equipment)

At the beginning of this journey, this was the test which made everything possible:

It was a good experience, and it provided some confidence in the whole concept.

Since then, no frame has snapped or otherwise failed.

Well, except for this one,  but it was intentional and was made for this purpose.

This test shows the static deflection.


But, it tells nothing about the handling and behavior while riding, on less-than-perfect roads for example – the dynamic experience.

So, how will the board behave dynamically?

To answer that, we need to find the natural frequencies of the board.

This usually involves a simple formula from high school physics (sorry about that) or a modal test.


I love doing modal tests, especially on planes. Now it is time to do one on a longboard.

Simple setup
Simple setup

In our case, the setup is simple; an accelerometer, modal hammer, data acquisition box to connect everything and a laptop.

The Rider is Missing

I was really happy with the setup initially…


And then it hit me – the rider is missing!


There is a little point of doing this test when you are missing the proper mass, and a significant one actually - an entire rider.


So, this was the solution…

120lb of metal parts
And the results?

Very good actually, slightly above 10Hz for the first frequency.

This should not cause any inconvenience on typical roads.


Are you interested in other fun/scientific things?

Let me know, I would like to learn.

@dosimplecarbon on IG







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