As Built
Harry O'HanleyTools for building hardware and companies. Perspectives for why they matter to the world.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 20 | Founded | a year ago | Last Issue | 4 months ago |
| Active | |||||
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asbuilt.pubLatest Issues
How to Pick an Orbit
Most explainers treat satellite orbits as altitude bands. LEO, MEO, and GEO are likened to floors in a building. Low is close. High is far. Pick your level.
But altitude is just one of many variables that define an orbit. Inclination, ecce...
Space is All of This
I’m planning the next few essays about space, a domain with nearly endless topics to write about. As I made my list, it grew and grew. Technology and geopolitics. The course humanity will take as it explores the edges of the universe. Wheth...
Going Off Nominal
Happy New Year! Kicking off the 2026 As Built series with one more engineering piece. In this case, a look at systems explicitly designed for when things aren't going as planned. Coming up, the next few essays in the pipeline are all space...
How Networks Survive
Last week was about sensor redundancy and how to get reliable data into a system. But data is useless if it can’t reach the components that need it. This is where networks come in. They’re the circulatory system of any complex machine, and...
Why Three Sensors, Not Two
Reliability engineering is often defined as:
a sub-discipline of systems engineering that emphasizes the ability of equipment to function without failure.
This framing relegates it to a specialty. A box to check. A task for a dedicated...
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Authors
The writers behind this newsletter.
Tools for building hardware and companies. Perspectives for why they matter to the world. Based on my experiences at MIT, SpaceX, ABL and Long Wall.
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