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Post by Carl on May 2, 2023 22:10:59 GMT
René, The impact must have alarmed the entire grandstand (especially those in front)! As everyone's heart rate bounced high in the immediate aftermath someone in a black hooded sweatshirt, either a youngster or a lady, needed a reassuring hug. 
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Post by Carl on May 3, 2023 16:16:50 GMT
Some are wondering how our administrator became familiar with the grinding racket of Russian cargo planes... 
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Post by mikael on May 3, 2023 17:31:54 GMT
I think your suggestion was right, Carl - the cutouts are probably for temperature control.
Initially I was thinking about some mechanism for extra down-force; but it's not clear how that should work ...
Actually, a rotating cylinder (like a rotating wheel) will generate lift or down-force (depending on the directions of rotation and flow), just like a wing. By an "airborne" formula car (as seen on the old Nürburgring) the wheels will (luckily!) generate down-force. But probably not very much (otherwise the principle would have been exploited a long time ago) - and it doesn't work when the wheels are on the ground and block the underside airflow ...
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Post by René on May 3, 2023 18:22:29 GMT
René, The impact must have alarmed the entire grandstand (especially those in front)! As everyone's heart rate bounced high in the immediate aftermath someone, either a youngster or a lady, needed a reassuring hug. Indeed, that was scary. As the Caddy slammed into the Tepco barrier you heard a sound of horror and fear go through the stands. I heard a girl behind me telling her boyfriend how scary that looked because she saw it happening but her friend only heard the bang. And I saw a young boy with his eyes wide open and didn't blink for minutes! Fortunately, Renger crawled out of the wreckage and he received a big round of applause. |
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Post by René on May 3, 2023 18:30:58 GMT
Some are wondering how our administrator became familiar with the grinding racket of Russian cargo planes... Carl, near my hometown there is an airport where a lot of cargo flights take place. In the past, gigantic Russian Antonovs also flew there, which made a huge noise. A deep and very loud sound, hence my association.   |
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Post by René on May 3, 2023 18:32:01 GMT
I think your suggestion was right, Carl - the cutouts are probably for temperature control.
Initially I was thinking about some mechanism for extra down-force; but it's not clear how that should work ...
Actually, a rotating cylinder (like a rotating wheel) will generate lift or down-force (depending on the directions of rotation and flow), just like a wing. By an "airborne" formula car (as seen on the old Nürburgring) the wheels will (luckily!) generate down-force. But probably not very much (otherwise the principle would have been exploited a long time ago) - and it doesn't work when the wheels are on the ground and block the underside airflow ... Supurb Mikael!  |
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Post by Carl on May 3, 2023 20:31:55 GMT
Interesting with those cutouts above the wheels. I wonder what the effect of this is, aerodynamically ... Also interesting that some cars have them only above the front wheels, while other have them also above the rear wheels.
It is an interesting feature and they all have it in some way so it will have a purpose. I have no idea how it works and have not found a good explanation yet online. In an earlier response I may have somehow later deleted  , I wondered if the purpose of cut-outs was to vent hot air from brake cooling, pressure that otherwise would be contained in the wheel wells, or to keep tyres at an optimum temperature and maintain ride height by opening an otherwise closed space at minimal aerodynamic cost. Regarding Formula One's drag reduction rear wing and Indycar's push to pass, the response of Formula One to extreme wake turbulence reveals a narrow one-track mind. To look only within aerodynamics for a solution to a problem created in the first place by an obsession with aerodynamics was not an expansion of thought, but an impediment. |
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Post by Carl on May 3, 2023 20:54:10 GMT
I think your suggestion was right, Carl - the cutouts are probably for temperature control.
Initially I was thinking about some mechanism for extra down-force; but it's not clear how that should work ...
Actually, a rotating cylinder (like a rotating wheel) will generate lift or down-force (depending on the directions of rotation and flow), just like a wing. By an "airborne" formula car (as seen on the old Nürburgring) the wheels will (luckily!) generate down-force. But probably not very much (otherwise the principle would have been exploited a long time ago) - and it doesn't work when the wheels are on the ground and block the underside airflow ...
Remarkable analysis, Mikael!
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Post by robmarsh on May 4, 2023 7:55:46 GMT
My understanding of the reason for the cutouts was because the air rotating off the wheels was building up under the bodywork and creating lift or at the very least a lighter front end. As the rear wheels were usually exposed at the back of the cars and the air could escape, it was not so prevalent there. I think the McLaren Can Am cars series M8 were the first to add louvres on the front wheel arches. With the ever increasing speed and rotation of the wheels this air pressure obviously got stronger causing more lift.
I think it was the Toyota Coupe towards the end of the 90's that finally did away with the louvres and exposed the wheels at the top of the arches.
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Post by Carl on May 4, 2023 15:33:55 GMT
My understanding of the reason for the cutouts was because the air rotating off the wheels was building up under the bodywork and creating lift or at the very least a lighter front end. As the rear wheels were usually exposed at the back of the cars and the air could escape, it was not so prevalent there. I think the McLaren Can Am cars series M8 were the first to add louvres on the front wheel arches. With the ever increasing speed and rotation of the wheels this air pressure obviously got stronger causing more lift. I think it was the Toyota Coupe towards the end of the 90's that finally did away with the louvres and exposed the wheels at the top of the arches. I think you nailed it, Rob. Well done! |
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Post by Carl on May 4, 2023 15:48:13 GMT
Enjoy Rene, I loved that 1973 312PB in the short race configuration. I thought the Le Mans car with the extra headlamps in the front looked a bit amateurish. Rob, I think we all remember the beautiful and amazingly detailed 1/12th scale model Ferrari 312 PB you handcrafted, which was seriously damaged in transit. Do you still have it? - Carl |
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Post by mikael on May 4, 2023 19:45:48 GMT
It sounds very plausible Rob.
One of us might come across a discussion/reference, to get the question settled definitely.
Yes, indeed, the Toyota GT1 (1998-1999) had cutouts on the "inside".
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Post by robmarsh on May 5, 2023 7:40:19 GMT
Enjoy Rene, I loved that 1973 312PB in the short race configuration. I thought the Le Mans car with the extra headlamps in the front looked a bit amateurish. Rob, I think we all remember the beautiful and amazingly detailed 1/12th scale model Ferrari 312 PB you handcrafted, which was seriously damaged in transit. Do you still have it? - Carl I do thanks Carl and funny enough I was looking at it yesterday and I think I can still fix it up so will start soon. |
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Post by René on May 5, 2023 10:44:03 GMT
It sounds very plausible Rob.
One of us might come across a discussion/reference, to get the question settled definitely. Yes, indeed, the Toyota GT1 (1998-1999) had cutouts on the "inside". One of the best looking prototypes ever! It should have won Le Mans but that was at a time when Toyota still had no idea how to win, in Endurance and F1! |
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Post by René on May 5, 2023 10:47:55 GMT
Rob, I think we all remember the beautiful and amazingly detailed 1/12th scale model Ferrari 312 PB you handcrafted, which was seriously damaged in transit. Do you still have it? - Carl I do thanks Carl and funny enough I was looking at it yesterday and I think I can still fix it up so will start soon. Please Rob, start building model cars again. It feels kinda lonely sometimes in the model car section nowadays without John contributing. |
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, I wondered if the purpose of cut-outs was to vent hot air from brake cooling, pressure that otherwise would be contained in the wheel wells, or to keep tyres at an optimum temperature and maintain ride height by opening an otherwise closed space at minimal aerodynamic cost.
