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Through the eyes of the cofounders.

Long-form writing on energy management, instruction, test flying, and the GA safety problems that keep us up at night. Drawn from articles written for industry publications (some previously unpublished) and original pieces from the TallyAero team — three founders with cockpit + code + wrench-time across the F/A-18, Typhoon, GA training fleet, and the engineering bench that turns all of it into software.

2026-05-14 9 min read Commissioned for AOPA

EM Diagrams Aren't Just for Fighter Pilots Anymore

Energy Maneuverability diagrams — the lifeline of military fighter training for half a century — finally show up in general aviation. A walk through the DA20-C1 envelope, the base-to-final danger zone, and why the airplane's behavior is geometric, not magical.

Nicholas Len · Founder · CFI/CFII/MEI · former F/A-18 + RAF Typhoon pilot/instructor · A&P

energy managementmaneuveringstall awarenesspattern workinstruction

Editorial note

These are first-person pieces by the people who built TallyAero — not anonymous content marketing. Some originally commissioned for AOPA / EAA / industry publications; others written for the TallyAero audience directly. We don't paywall safety content.

Through the eyes of the cofounders.

EM Diagrams Aren't Just for Fighter Pilots Anymore