The 917 (kurz-heck) was Cd 0.44, and 210-mph, @ 560-hp.
The 917 ( lang-heck) was Cd 0.33, and 236-mph, @ 560-hp.
The shorter race courses did not require the Cd of the (lang-heck), which was specifically for the Mulsanne Straight @ LeMans, top speed, and fuel management.
