Sometimes we name our vehicles on a whim or just because it sounds cool. This time there’s a bit more to it than that. **Eta Prime** promises to be our best-ever speedbike, and indeed one of the fastest bikes in the world, so we chose its name carefully to acknowledge the origins of the design and speak to our motivations for doing this project.

We wanted to use “Eta” in the name for two reasons. First, it’s an acknowledgement of AeroVelo‘s achievements with the original **Eta** speedbike. They created an excellent foundation for this new vehicle, and every success we have with **Eta Prime** is theirs to share. Second, “Eta” – properly written as the Greek letter **η** – is the symbol for efficiency throughout the engineering world; that’s why AeroVelo chose the name to begin with. Achieving high speeds on limited power is all about efficiency.

In engineering and mathematics, quantities are often manipulated through many steps of calculation until they’ve been transformed into something else, but still related to the original. This change is denoted by the “prime” symbol, which looks like an apostrophe. In particular, a derivative of something (it’s slope function, in simple terms) is often indicated by a prime. For example, a function x would have a derivative x′ (read as x-prime). We’re bringing new ideas and perspectives to the **Eta** design, so we’re calling the result **Eta Prime**. It’ll have have many differences, but this new speedbike will still be a derivation of the original.

η → η′

Stay tuned for more updates as we re-design, build, and test this new vehicle!

**Calvin Moes**, HPVDT Captain