Why did the SR-71 leak fuel on the ground?

Its panels only sealed after heating and expanding in flight

SR-71 Blackbird Quiz: Speed Records and Titanium Design

A black spy plane flew so fast and so high that it simply outran missiles, and this SR-71 Blackbird quiz explains how it was built. Play an interactive set of 10 questions on Lockheed's Skunk Works, Kelly Johnson, Mach 3 flight, the 1976 records, titanium sourced from the Soviet Union, leaking fuel tanks, JP-7 fuel, pressure suits, the 1990 coast-to-coast dash and its retirement.

Start SR-71 Blackbird Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Maker
Which Lockheed division built the SR-71?
Designer
Who led its design?
Speed
Roughly how fast could the SR-71 fly?
Record
What speed record did it set in 1976?
Metal
What was most of the airframe made of?
Source
Where did some of its titanium secretly come from?
Leak
Why did the SR-71 leak fuel on the ground?
Missiles
How did it avoid missiles?
Dash
How long did its 1990 Los Angeles to Washington flight take?
Retire
When did the SR-71 finally stop flying?

Explanations: answer key for all 10 questions

Q1: Which Lockheed division built the SR-71?
Answer: The Skunk Works
It worked in secret.
Q2: Who led its design?
Answer: Kelly Johnson
He also designed the U-2.
Q3: Roughly how fast could the SR-71 fly?
Answer: Over Mach 3
That is over three times the speed of sound.
Q4: What speed record did it set in 1976?
Answer: About 3,530 km per hour
It still stands for its class.
Q5: What was most of the airframe made of?
Answer: Titanium
It could handle extreme heat.
Q6: Where did some of its titanium secretly come from?
Answer: The Soviet Union
It was bought through front companies.
Q7: Why did the SR-71 leak fuel on the ground?
Answer: Its panels only sealed after heating and expanding in flight
It refueled soon after takeoff.
Q8: How did it avoid missiles?
Answer: By outrunning them
None ever hit it.
Q9: How long did its 1990 Los Angeles to Washington flight take?
Answer: About 64 minutes
It was its final record flight.
Q10: When did the SR-71 finally stop flying?
Answer: In the late 1990s
NASA flew the last missions.

Sr-71 Blackbird Quiz – Speed Records and Titanium Design

The SR-71 Blackbird was a reconnaissance jet built by Lockheed's Skunk Works under Kelly Johnson. It flew over Mach 3 at very high altitude, and in 1976 it set a speed record of about 3,530 km per hour that still stands for crewed air-breathing jets.

Most of its airframe was titanium, some secretly bought from the Soviet Union through front companies. Panels fit loosely on the ground and sealed only when heated in flight, so it leaked fuel before takeoff. Pilots wore pressure suits like astronauts.

The SR-71 outran every missile fired at it. In 1990 it flew from Los Angeles to Washington in about 64 minutes. It retired from the Air Force in 1990 and from NASA research flights in the late 1990s.

What This Quiz Teaches

Aviation fans will enjoy these questions.

Who built the SR-71
How fast it flew
What it was made of
How it avoided threats
When it retired

Did You Know?

It burned a special fuel called JP-7.
Its black paint helped shed heat.
Many survive in museums today.
It flew at altitudes above 24 km.
The earlier A-12 was a single-seat version.