Reavaliação técnica mostra que SR-71 gerava 80% do empuxo de cruzeiro nas entradas de ar

Motor J58 funcionava como turbo‑ramjet em pós‑combustão contínua; exigia combustível JP‑7, ignição por trietilborano e manutenção intensa

Ontem, 20:53

Cobertura recente de setembro de 2026 reafirma que, a Mach 3,2, o SR‑71 produzia cerca de 80% do empuxo de cruzeiro nas entradas de ar e no bocal ejetor, e não no núcleo do motor.

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A Pratt & Whitney e históricos técnicos descrevem o J58 como um turbo‑ramjet que operava em pós‑combustão completa por horas, com temperaturas de escape próximas de 3.400°F (1.871°C).

O motor usava um sistema patenteado de bleed‑bypass no compressor que desviava ar ao redor do núcleo para o pós‑combustor, aumentando o fluxo de massa e evitando o surge do compressor em alta velocidade.

Manter a pós‑combustão contínua exigia o combustível JP‑7 e ignição por trietilborano, o que levou a grande consumo de combustível, ciclos de manutenção intensos e logística especializada.

Memórias de pilotos e relatos do programa mostram como o projeto da propulsão determinou o formato da fuselagem, os custos e os riscos operacionais, e por que as soluções de fabricação para titânio do SR‑71 seguem sendo parte importante de seu legado.

Resumo produzido a partir de 6 fontes em 2 veículos · Powered by Anchooor

Reavaliação técnica mostra que SR-71 gerava 80% do empuxo de cruzeiro nas entradas de ar

6 Fontes

Over 4,000 Missiles Failed to Hit a Single US Air Force Mach 3.2 SR-71 Blackbird. Speed Was the Only Way to Survive as It Had No Weapons to Fire Back

The Mach 3 US Air Force SR-71 Blackbird Ran on a Fuel So Stable You Could Put Out a Match in It. Then They Had to Invent a Way to Light It.

To Fly the US Air Force SR-71 Blackbird at Mach 3 and 85,000 Feet You Needed an Astronaut’s Body, Iron Nerves, and the Stomach to Outrun Soviet Missiles

The United States Did Not Have Enough High-Grade Titanium to Build the SR-71 Blackbird, So the CIA Bought It From the Soviet Union Through Shell Companies in Neutral Countries. The Airframe Was 85 to 90 Percent Titanium, and Much of the Ore Came Out of Soviet Ukraine.

The Lockheed SR-71 Blackbird’s Pratt & Whitney J58 Engines Ran at Full Afterburner for Hours at a Time With Exhaust Temperatures Near 3,400 Degrees. At Mach 3.2 Cruise, Roughly 80 Percent of the Thrust Came From the Inlet, Not the Engine.

SR-71 pilot recalls doing a Blackbird super low pass at a speed of 152 knots

Reavaliação técnica mostra que SR-71 gerava 80% do empuxo de cruzeiro nas entradas de ar

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6 Fontes

Over 4,000 Missiles Failed to Hit a Single US Air Force Mach 3.2 SR-71 Blackbird. Speed Was the Only Way to Survive as It Had No Weapons to Fire Back

The Mach 3 US Air Force SR-71 Blackbird Ran on a Fuel So Stable You Could Put Out a Match in It. Then They Had to Invent a Way to Light It.

To Fly the US Air Force SR-71 Blackbird at Mach 3 and 85,000 Feet You Needed an Astronaut’s Body, Iron Nerves, and the Stomach to Outrun Soviet Missiles

The United States Did Not Have Enough High-Grade Titanium to Build the SR-71 Blackbird, So the CIA Bought It From the Soviet Union Through Shell Companies in Neutral Countries. The Airframe Was 85 to 90 Percent Titanium, and Much of the Ore Came Out of Soviet Ukraine.

The Lockheed SR-71 Blackbird’s Pratt & Whitney J58 Engines Ran at Full Afterburner for Hours at a Time With Exhaust Temperatures Near 3,400 Degrees. At Mach 3.2 Cruise, Roughly 80 Percent of the Thrust Came From the Inlet, Not the Engine.

SR-71 pilot recalls doing a Blackbird super low pass at a speed of 152 knots