Where the facts come from
Every factual claim on this site links to its source. This is the full list.
How we checked
Each fact was written in our own words alongside its source. Our build script stores the text of every source and, for each fact, checks that the key words and figures really appear in it. 125 of 125 checks passed when this site was last built (9 November 2026). Where we couldn’t find a named source saying something, we left it out. Where good sources disagree, we say so and give both.
Where sources differ
- The crash. Fuller’s own account, repeated by Robert Marks, by CNN and by Hemmings, blames a rubbernecking park commissioner whose car was spirited away. Alec Nevala-Lee’s 2022 biography, adapted in Slate, uses newspaper reports, the inquest and Fuller’s papers to show the other driver was Meyer Roth, who hit the Dymaxion only after it began to roll. We give both, and say which we find more convincing.
- Top speed and economy. Fuller claimed 120 mph; Hemmings calls that unproven; Nevala-Lee and the Lane Motor Museum give about 90 mph. Fuel figures range from 22 to 40 mpg depending on the source and the load.
- The name. Hemmings and the National Automobile Museum say dynamic, maximum and ion; Hagerty says dynamic, maximum and tension.
- The debut. Hemmings gives 12 July 1933 as the public debut; Nevala-Lee says the car was finished that day and unveiled on 21 July.
- Size and weight of car No. 1. Nevala-Lee: 19 feet and about 2,700 lb. Hemmings: 20 feet and under 2,300 lb.
- Charles Dollfus. Nevala-Lee spells him Dollfus and calls him an attaché with the French Air Ministry; Hemmings spells him Dolfuss and, like Fuller, calls him the Air Minister of France; Stanford’s archive page spells him Dollfuss.
- Who paid. Anna Biddle, Phillip Pearson, or both.
- Car No. 2’s early life. Hemmings says it went to a group of the company’s mechanics; Hagerty says Fuller kept it as a demonstrator and rolled it in 1935.
- Car No. 1’s end. Nevala-Lee and Hemmings: fire, 1943. Hagerty’s road-trip report: a rollover in 1939. The Lane Motor Museum: “one destroyed in a crash, the other in a fire”.
- Car No. 2’s rescuers. Hemmings says University of Arizona students; CNN says Arizona State.
- The Foster replica. One Hemmings writer says it was patterned on No. 2, another calls it a recreation of No. 3.
- The National Automobile Museum page we cite is an archived copy from 2007, because the museum’s current site blocks automated checks. Its spec panel lists a Renault V-6 engine, which looks like an error, so we don’t use it.
- The photos. The green replica in our photos at Bilbao and Goodwood matches Hemmings’ description of the car built for Norman Foster (green, white roof, fin), but the photo pages don’t name it, so we don’t claim it outright.
All sources (13)
- Slate: Alec Nevala-Lee, The dramatic failure of Buckminster Fuller’s “car of the future” (2022), adapted from his biography Inventor of the Future (53 facts)
- Hemmings: Cars of Futures Past, Dymaxion 4D Transport (Kurt Ernst) (34 facts)
- Hemmings: Dymaxion returns to National Automobile Museum after restoration (Daniel Strohl) (10 facts)
- Hagerty: Night at the Museum, the Lane Motor Museum and its Dymaxion replica (4 facts)
- Lane Motor Museum: 1933 Dymaxion replica, now on display (2015) (4 facts)
- National Automobile Museum, Reno: collection page for the 1934 Dymaxion No. 2 (archived copy, September 2007) (4 facts)
- Stanford University: Dymaxion passenger files and Fuller’s own account of the Chicago crash (archived copy, 2012) (4 facts)
- CNN Style: Dymaxion, how this radical 1930s car changed vehicle design (2019) (3 facts)
- Google Patents: US 2,101,057, Motor vehicle, Buckminster Fuller (filed 1933, granted 1937) (3 facts)
- Hagerty: Looking back at tomorrow, driving the Lane Dymaxion replica to Amelia Island (3 facts)
- Hemmings: In search of the birthplace of the Dymaxion (Daniel Strohl) (1 fact)
- The Henry Ford: Dymaxion House (1 fact)
- Times Colonist: Bill Vance, Ford went extra mile with atomic cars (2020) (1 fact)