The plan going forward is to do controlled testing of the 3D printed models.

Dave will be starting testing with the model I already made, which we expect to give us some level of directionality. However the model I created has a couple of issues, including that the major cavities are all the same size with the inlets size varied to vary the resonance. We think though that it would be more sensible to vary the major cavity sizes and keep the inlet sizes the same as the cavity will be the dominating factor. Which is going to be a more tedious but interesting challenge in OpenSCAD that I will be tackling through the next stage Anything Goes.

We then intend to develop software that takes recorded sound from the central void and performs the direction / speed processing analysis.

Plans are of course malleable, but our first guess based on our time available is:

(a) now+1 Month - refine 3D printed models and test the math - fits well in Anything Goes stage. So during this stage skills required include understanding the maths and signal processing, and design & creation of 3D printed models

(b) now+3 Months - code software and then go out and test it using either a laptop or smartphone and refined model and latest 3D printed sensor. We think collecting the data then fits nicely into the 'Citizen Science' stage. Skills include software development - ideally for a smartphone but given the time constraints we might decide to just go with a program on a laptop, we will play this by ear. And the ability to record and concisely document our results.

My 3D printer is a home brew based on the q3d TwoUp and has been experiencing a few reliability issues, so an upgrade would not go astray ;-)