Lynch remained involved.
On August 19, 1947, he performed another important airborne ejection.
This time the Meteor was at approximately 12,000 feet and 420 miles per hour indicated airspeed.
The increase from 320 to 420 mph was not a small change from the point of view of the human body.
Aerodynamic forces rise rapidly with speed.
The seat would enter a much harsher slipstream.
The face-screen protection would be tested more severely.
The stabilization system would have to manage greater aerodynamic loads.
Lynch pulled the firing control again.
The seat left the Meteor.
The system stabilized.
He completed the escape.
Lynch landed safely.
Martin-Baker recorded a particularly important observation afterward.
He reported that he had felt “no shocks” during the high-speed ejection.
For the engineers, that statement supported several conclusions.
The ejection gun was delivering its force smoothly enough.
The face screen remained effective.
The drogue was controlling the seat properly at the higher speed.
The experiment had now moved well beyond a single successful flight.
A repeatable technology was emerging.
Britain had already decided the system was worth adopting
In June 1947, before Lynch's 420-mph test, British authorities had decided to standardize the Martin-Baker ejection seat for installation in new service jet aircraft.
Production and installation work began for types including the Meteor, Attacker, Wyvern, and Canberra, followed later by aircraft such as the Sea Hawk and Venom.
That decision marked a major transition.
The ejection seat was no longer merely an experimental safety device.
It was becoming standard military equipment.
The problem was now larger than proving the concept.
Martin-Baker had to turn a hand-built experimental system into a product that could be installed repeatedly, maintained by military personnel, and trusted by pilots who had never met the engineers.
An experimental device can receive constant attention from its designers.
An operational seat may sit unused for years.
It must survive vibration, temperature changes, maintenance cycles, aircraft movement, moisture, and repeated handling.
Then, perhaps after thousands of flight hours, it may receive one command.
It must work immediately.
There is usually no second attempt.
That requirement would shape Martin-Baker's future far more than the spectacular first test.
The production Mk1 still required considerable work from the pilot
The first operational Martin-Baker seats were much less automatic than modern systems.
After leaving the aircraft and stabilizing, the occupant still had to separate manually and operate his parachute.
The system therefore needed altitude.
A pilot ejecting too close to the ground might clear his aircraft successfully but still not have enough time for the remaining sequence.
That limitation was serious because many military accidents occur during takeoff and landing, when altitude is lowest.
Engine failure during cruise might leave thousands of feet for escape.
An engine failure shortly after takeoff might leave seconds.
Engineers therefore began working on the next generation of problems.
How could seat separation become automatic?
How could the parachute be deployed without relying on a pilot who might be injured or unconscious?
How could a seat work at lower altitude?
Could a pilot eventually eject while the aircraft was sitting on the runway?
Every successful improvement moved the survival boundary downward.
The first real emergency proved why Lynch's test mattered
Lynch's flights were deliberate experiments.