Quote:
Originally Posted by hcl123
sorry to reply out of order,but... ACO thinks so... 9 liter less for diesels tanks is justified by saying that diesel has 10% higher BTU for the same fuel volume.
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Just compare the density of the 2 racing fuels provided by Shell: 834 kg/m3 for diesel (see
here) vs 754 kg/m3 for petrol (see
here).That is a difference of 10%. Could this be a coincidence?
Quote:
Originally Posted by hcl123
which is a lie of course... unless diesels where running JP8 kind of aircraft fuel which is very doubtful for a lot of reasons...
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As far as I can tell the only advantage of JP-8 fuel is that it works better in low temperature conditions (does not gel). It has a lower cetane number than regular diesel and hence a longer ignition delay. In fact, the Shell race diesel is a blend of petroleum based diesel and synthetic GTL in order to have a higher cetane number (59.4) than regular diesel.
Quote:
Originally Posted by hcl123
Ok here goes my stance for the R18
Spider open concept
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Audi has found out from racing the Peugeot 908 that closed car have an aero advantage. Next year, with the reduced power this will be even more important. See
http://www.autosport.com/news/report.php/id/84533
Quote:
Originally Posted by hcl123
4 wheel drive with 4 small electric motor/generators in each wheel hub, perhaps in the range of 20 HP each, not more...
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I think a setup like the hybrid Toyota Supra is more sensible: 2 small in-wheel electric motors at the front and at the rear 1 bigger electric motor integrated in the gearbox (like Zytek solution/F1 KERS). In-wheel motors at the rear will be messy because the driveshafts are also going to the wheels.
Quote:
Originally Posted by hcl123
A Litium ion battery pack that will allow to store the max amount of energy, in electric form as permitted by the rules.
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It is not clear whether a chemical battery is the best solution. Toyota used supercapacitors and Porsche a flywheel battery. You need to do a lot of charge/discharge cycles during 24 hours.
Quote:
Originally Posted by hcl123
Main engine a 3.7 Liter V8 biturbo diesel with double head camshaft and 4 valves cylinder
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Rumors suggest Audi will go for a V6 configuration. See
http://www.racecar-engineering.com/n...prototype.html
Quote:
Originally Posted by hcl123
It would be a clever trick!... the rules have holes and blanks... but 2 of the electric hub motors can be made to run constantly from cruising to acceleration, perhaps the front wheel motors with power generated and delivered directly from the other 2 wheel hub motors acting as generators on the rear axle, by-passing that way the batteries.
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Why would you want to drive the front wheels "constantly"? Isn't it better to do this on demand i.e. when the rear wheels lose grip?