The BMW roundel does not depict a propeller. It depicts the colours of the Bavarian flag, and BMW has said so in its own materials. The propeller is an advertising idea from the late 1920s that outlived the advertisement.
That is the whole answer. What follows is the evidence, the reason the myth is so durable, and the detail almost every retelling gets wrong — including the one about why the colours are the wrong way round.
BMW roundel, 1917 original, shown large. Square, transparent background, 1600×1600 minimum.
What the colours actually are
Blue and white are the colours of Bavaria, the German state where BMW was founded in Munich and is still headquartered. The name says the same thing — Bayerische Motoren Werke means Bavarian Motor Works. The badge and the name are both statements of where the company is from.
BMW registered the mark in the trademark registry of the imperial patent office on 30 September 1917, and every BMW product since has carried it.
The quarters are reversed, and that is deliberate
Here is the detail that catches people who go and check the flag. The Bavarian flag has white in the upper left. The BMW roundel has blue there. They are mirrored.
The reason is legal, not aesthetic. Trademark law of the period prohibited the use of state coats of arms and sovereign emblems in commercial trademarks. Reproducing the Bavarian arrangement exactly would have made the mark unregistrable. Reversing the order kept it legal.
So the roundel is simultaneously a reference to Bavaria and a careful avoidance of Bavaria’s actual emblem — which is a more interesting fact than the propeller and almost never mentioned alongside it.
Where the propeller came from
The BMW aircraft-engine advertisement showing the roundel as a spinning propeller, late 1920s.
Landscape, 1600px wide minimum. Available via BMW Group PressClub for editorial use.
BMW Group’s own account is unambiguous about the sequence: the logo was first portrayed as a stylised rotating propeller in advertising material of the late 1920s, and that interpretation endures to this day.
Read that carefully. It says the logo was portrayed as a propeller in advertising — not that it was designed as one. The company took an existing badge and told a story about it, because at the time it was selling aircraft engines and the story helped.
The advertisement worked far better than anyone intended. A marketing device from the 1920s is now the single most repeated fact about BMW, told back to the company as its own history.
Why the myth survives
Three reasons, and they reinforce each other.
It is a better story. “The badge is a propeller from our aviation past” beats “the badge is our state flag, reversed for trademark reasons”. Better stories travel further regardless of accuracy.
BMW did have an aviation past. The company genuinely built aircraft engines, and the founding of Bayerische Flugzeugwerke in 1916 is the date BMW celebrates. The myth is adjacent to a truth, which makes it much harder to dislodge than an outright invention.
BMW has never aggressively corrected it. The company states the Bavarian origin plainly in its historical materials while continuing to let the propeller association live. It is not a lie the company tells; it is a lie the company tolerates.
What the letters mean
The three letters on the black band are the company’s initials: Bayerische Motoren Werke. B for Bavarian, M for Motoren — engines — and W for Werke, works or factory.
Note that the M here is not the M of the M3 or M5. That M stands for Motorsport and belongs to BMW M GmbH. The two are unrelated and the coincidence causes constant confusion; we untangle it in the BMW M logo explained.
Has the meaning ever changed?
No. The composition has been refined seven times since 1917 — the gold ring removed in 1933, proportions cleaned up in 1954, simplification for small reproduction in 1974, spacing adjusted in 1979, the three-dimensional treatment in 2007, and the flat communication logo in 2020 — but the elements have never been replaced. Every version of the story is on the BMW logo history page, with each design shown.
One point about the 2020 logo, because it is widely misreported: it is a communication mark used in advertising and online. BMW states that it is not used on vehicles or on dealership signage, where the existing logo remains. The badge on a new BMW is still the 2007 design.
Common questions
Does the BMW logo represent a propeller?
No. It represents the blue and white colours of the Bavarian flag. BMW’s own account states the propeller interpretation came from advertising material of the late 1920s, years after the badge was registered in 1917.
Why is the BMW logo blue and white?
Those are the colours of Bavaria, the German state where BMW was founded and still has its headquarters.
Why does the BMW logo not match the Bavarian flag exactly?
Trademark law of the period barred the use of state emblems in commercial marks. Reversing the order of the quarters made the design registrable.
Did BMW invent the propeller story?
Effectively, yes. BMW presented the roundel as a stylised rotating propeller in its own aircraft-engine advertising in the late 1920s. The company created the association and has never actively dismantled it.
What do the three letters stand for?
Bayerische Motoren Werke — Bavarian Motor Works.
Is the M in BMW the same as the M in M3?
No. The M in BMW is Motoren, meaning engines. The M in M3 is Motorsport, the performance division.
Sources
- BMW Group — History: the blue-and-white logo in the colours of Bavaria, the trademark registry entry of 30 September 1917, and the statement that the logo was first portrayed as a stylised rotating propeller in advertising material of the late 1920s.
- BMW Group PressClub — Introducing BMW’s new brand design: the 2020 communication logo and the statement that it is not used on vehicles.