Hi everyone.
This post is a change of pace--literally. Instead of talking about World War II or the technology from that period used in that conflict, I'm switching genres and time period. While my electricity was out after the Sunday windstorm, I started to get back into auto racing and the history of it. I won't be reaching back too far, in this case 2006-2008 with one of my favorite racing cars of all time, the Audi R10.
It was notable for being the first diesel powered car to win Le Mans, one of the first to have notable success in auto racing, period, and its design and construction influences top class Le Mans type racing cars nearly 15 years after it broke cover.
Even though diesel powered cars no longer race at Le Mans (that ended when Audi Sport withdrew from top flight prototype sports car racing in late 2016), the basic design of the R10 is still a design influence. Even though it's open cockpit (which became less common after 2008 and eventually totally phased out at Le Mans in 2017), it's chassis design is still pointing the direction to go. Almost all Le Mans Prototype cars still use a "all monocoque" chassis, where there's no bodywork covering the chassis beyond non-structural elements. This allows the whole front and rear clips of the car to be detached in big chunks for rapid changes of damaged parts, set up changes and chassis/suspension adjustments.
Then there's it's 5.5 liter V12 turbodiesel engine. Both the engine's basic design principals and being a diesel were outgrowths of the earlier R8 program (the current Audi super car and GT racers were named after the earlier R8 LMP car). Namely, the R8's (and Audi road car) direct gasoline injection system was an outgrowth of Audi's TDI (Turbocharged Direct diesel Injection) system, but applies to gasoline engines. With the R10, things came full circle.
The engine made over 650-700 horsepower and over 900 lbs/ft of torque. In a car that weighed 900-925 kg (depending on series rules and season the car competed in), and, initially, had no traction control (and even then barely worked most of the time, which the drivers actually appreciated it's minimal interference). When the R8 raced, traction control was illegal and only became legal in 2006 (though the R10 initially ran without it).
The car didn't just impress with its speed, but relative near silence on account of the turbocharged, low-revving diesel engine. When on considered that the earlier R8 (which used a 3.6 liter turbocharged V8) wasn't especially loud for a race car, that's saying a lot.
It also helped introduce the modern long wheelbase design into LMP racing. This was partly to keep as much weight as possible within the car's wheelbase for handling reasons. It also enhanced handling at high speeds and in rapid direction changes. It also allowed the R10 to run to near the maximum LMP1 car length of 4650mm, given that LMP1 cars from 2006 to 2020 were restricted in terms of front and rear overhang (distance of bodywork allowed to extend beyond the confines of the wheelbase), though wheelbase (distance between front and rear wheel centerlines) was unrestricted. Formula 1 cars and Indy Cars, for example, also run such long wheelbases for the same reasons.
For reference, Audi Sport compared the R10's wheelbase to that of the then similarly new first generation Audi Q7 full size SUV, and is still comparable to full size sedans and full size SUVs. This, however, posed no impediment to agility for reasons mentioned above.
The only Audi prototype that was more dominant or accomplished in racing was the earlier R8, who's DNA was all over the R10. From here on out in this post are links to info, photos and videos.
Evo Magazine article from 2008 track test: https://www.evo.co.uk/audi/6720/audi-r10
Photo gallery from same test:
Technical blogs with photos and illustrations: http://www.mulsannescorner.com/audir10.html
And now videos, including a legendary drive from then Audi Sport factory driver (and now Audi Sport Formula E team manager) Allan McNish from worst to first at Petit Le Mans in 2008.
McNish part 1:
Part 2:
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