Incidentally, there's an interesting story about how the 917/20 later figured in the 24-hour race. Reinhold Joest was driving when it crashed while about to go into the lead. He said that under braking at Arnage, the car suddenly turned right into the guard rail, but nobody believed him, and he was blamed.
Years later, Gerry Sutterfield restored the car for the factory museum. When he disassembled it, he found that the right front brake pads were down to bare metal and showed evidence of having welded themselves to the brake rotor. Porsche had fixed the body for display but had never done a full restoration, so they didn't notice that. Gerry discovered the evidence of the brake problem. Evidently what led to the problem was that no one realized that with its lower aerodynamic drag, the 917/20 took more brake effort to slow it. Consequently it used up pads sooner than the other cars.
Frank
Frank: I'm convinced that's the true story, although there's another thread on here (can't find it just now) where a TNF member was talking to Willi Kauhsen at the Goodwood Festival of Speed and either Kauhsen wasn't aware of Gerry Sutterfield's findings or else he didn't believe them, however the evidence speaks for itself. Of course, race reports suggested Joest 'butchered' it, but I suppose that's inevitable!

I've always wondered how Willi Kauhsen felt about the livery applied for the race - I've seen a photo of him in the pits, looking seriously disgruntled as the Porsche stylists are putting the finishing touches to the 'butcher's diagram'. Story is that the Porsche styling department had submitted its own proposal for the project, which was to design a short-tail 917 with the low drag of the long-tail but without the length, and although its submission was supposedly more successful, it was rejected for 'political reasons' - the eventual, actual 917/20 was submitted by SERA, responsible for the Long-tail - so the Pink Pig livery was the styling department's revenge!
Fact is, even though Norbert Singer suggests, "It was not a very good car and was never going to win, although it got a lot of publicity," as you point out, with a clear run it
could have won. It was up with 053, the eventual winner, when it crashed out; you have to wonder, given its comical colour scheme, how that would have gone down, in history or anywhere else!
Incidentally (you'll know this if you've got the book, but I found it quite incredible), Norbert Singer explains and illustrates in 24:16 that the wind tunnel Porsche used then, located in a shed and affiliated to Stuttgart University, was seriously flawed. It was used to test scale models of full-size aircraft as well as cars, so the cars were suspended on aerofoil-section wooden planks from the ceiling by cables; it therefore took little account of ground clearance (although the mimimum clearance in the Le Mans regulations then was quite high - 100mm). Years later, as was suspected from extensive track test results at the time, it was established that the aerodynamics - not just the drag (or lack of), but also the downforce - of the 1971 917LH (and probably, by association, the 917/20) were far superior to what the old wind tunnel figures suggested. My theory is that the downforce lowered the ride height, which increased the downforce further and lessened the drag - the best of both worlds, up to a point - an effect which would barely have shown up in the wind tunnel, given its limitations. That's just a theory, though - what would I know? Anyone on here who's better qualified (there must be lots!) wish to comment?
Edited by markpde, 03 May 2009 - 15:34.