[redpoint5]

I enjoyed watching and suggest the following:

1. Reduce the length of each video by 25%. Spend less time on the intro and the exit from each idea, and instead just present the idea. In the first video, too much time was spent revisiting which cars are being tested, and which books were used to gleam the info. That sort of material can be added in the notes to the video instead of occupying the valuable meat of the info.

2. Develop an elementary intro to aerodynamics that discusses things like why attached flow is desirable, and how various high and low pressures develop and what those forces do to the vehicle.

3. Break the ideas up into smaller segments. This will help to reduce the intro video length. An independent video can explain how hydrogen bubbles are produced for those that are curious, but hydrogen bubbles don't have anything directly to do with aerodynamics.

I think the mistake most (uniformed) people make when conceptualizing aerodynamic shape is that they think in terms of cutting through the air. People already know through experience that a sharp blade cuts through objects better than a blunt object, and so their focus is drawn to separating the air at the front of an object while neglecting the other aspect of bringing the fluid back together again. This focused attention at the leading edge is likely why roof racks appear to the public to be designed with aerodynamics in mind, while the trailing transition is neglected.

I'm curious if very small aerodynamic changes can be observed and/or measured at small scale using your equipment. On Ecomodder, people add moon discs or wheel spats, and it would be neat to visualize the change that makes, or have data to quantify the drag reduction (or even increase).