[kach22i]

KAR KRAFT: Ford’s Specialty Vehicle Program (New Book) | Nevada Musclecars.com

Ken Miles testing the Ford J car at Riverside Raceway prior to the car being reconfigured into the MK IV that would win Le Mans in 1967.

https://www.autopuzzles.com/The%20Challenge.htm

1966 Ford J car during test.................

Looking like a breadvan, the car was aerodynamically unstable.

Looks like they tried to fixed it with a rear spoiler, first cooper then aluminum struts.

https://www.youtube.com/watch?v=NaSgcBz1MKM

https://www.youtube.com/watch?v=wKJzC3Z-XpU

The later "long-tail" J7

1967 Ford GT40 Mk IV J-7
https://shelbyamericancollection.org...t40-mk-iv-j-7/

After Le Mans in 1966, Ford realized that the Mk II was reaching the end of its competitive life. It was heavy, and its aerodynamics were compromised. The decision was made to return to Le Mans with an all-new car incorporating the latest technology, with almost no regard to cost. To win Le Mans with an all-American car, Ford was willing to spend whatever was necessary for the best designers, equipment, drivers and crew. Because this new racer was designed to comply with Appendix J of the FIA’s regulations, it was known as the J-Car. This would be the final, most advanced version of the GT40.

Entirely new from the ground up, the J-Car shared almost nothing with the GT40 beyond a 427 engine. Shedding almost 300 lbs., its chassis and body were constructed using aircraft techniques, with a honeycomb aluminum main structure reinforced by riveted aluminum L-sections, with a bonded and riveted on aluminum skin. The bonding process required that the entire chassis be cured in a high-temperature autoclave. Given its narrower driving compartment, the car’s frontal area was less than a Mk II, reducing drag; even the hinged flap over the fuel filler helped.

http://slotcarillustrated.com/portal...ad.php?t=68899

J-car (top) and MkIV (bottom). Similarities are in the beholders eye...