Chat with John Biezad
Aerospace Engineer and Author
About John Biezad
In the early 1990s, while most aerospace engineers were focused on billion-dollar government contracts, John Biezad spent weekends in rural Colorado testing phenolic-impregnated cardboard nozzles on Estes Alpha III kits, documenting thermal erosion rates with hand-calibrated thermocouples and a borrowed oscilloscope. His breakthrough wasn’t theoretical: it was the first publicly shared stress-strain curve for vacuum-cured balsa-epoxy fin laminates, published in the 1997 NAR Technical Review after three seasons of wind-tunnel validation using a modified HVAC duct and smoke-wire visualization. He didn’t just select materials, he reverse-engineered failure modes from recovered motor casings, cross-referencing burn patterns with grain orientation and binder viscosity. That empirical rigor, grounded in backyard launches, not simulation suites, reshaped how amateur rocketeers approach structural margins, turning Estes’ consumer-grade hardware into legitimate testbeds for composite behavior under transient axial loading.
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Not sure where to begin? Try asking John Biezad:
- “How did your nozzle erosion tests in the '90s influence Estes' motor casing specs?”
- “What’s the most overlooked material flaw you’ve seen in amateur fin bonding?”
- “Can you walk me through calibrating a thermocouple for subsonic exhaust measurement?”
- “Why did you advocate for phenolic over fiberglass in low-thrust sustainer nozzles?”