I'll take the easy way out—the manufacturer of #4:
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General Enquiries
Roach Manufacturing Ltd
Off Whitemoor Lane
Ower, Nr. Romsey
SO51 6AJ
Telephone: +44 (0)23 80 814287
Fax: +44 (0)23 80 813970
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poke at the links here
Dymaxion Car
OR here
Dymaxion Car
The Dymaxion Car Rides Again says
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The car was to be lightweight (about the the weight of a VW Beetle), economical, aerodynamic, and fuel efficient.
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In 1933 wouldn't it have been the V8-60? Let us know what you find out.
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1993 Dymaxion Concept Car Aerodynamic Analysis
Dymaxion Concept Car Aerodynamic Analysis | CFD | TotalSim Ltd
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Figure 2 is a ‘drag accumulation’ plot which shows hows the drag builds up along the length of the vehicle. It’s is interesting to note that the total drag of the car up to the front wheels is almost zero for the straight ahead flow and negative for the 15 deg yaw case. In other words, a significant amount of thrust is being generated around the front of the car which offsets the stagnation pressure acting on the nose.
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From their charts, 5m long, or 5.5 yards or 16.5 feet. Other sources say 20 feet.