New 2021 rules

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jjn9128
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New 2021 rules

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Even though the massive rule change delayed to 2022 there are still some changes to the technical regulations for 2021, with a new ban on floor slots and a triangular cutout from the maximum width at the rear face of the cockpit entry template, to 650mm from the car centreline at the rear axle line. The idea being to cut some downforce.

Nice illustration from F1.com - looks like Sauber provided a car.
Image
Image

There's also a 3kg increase in the minimum weight - on the power unit increasing from 147kg to 150kg. There is a change of definition making it explicit that 4 studs can be used for the gearbox mounting to the ICE, and a stipulation banning the DAS steering.
#aerogandalf
"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

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JordanMugen
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Re: New 2021 rules

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Very interesting changes indeed! Thank you for the post jin9128. =D>

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Holm86
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Re: New 2021 rules

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As far as I know, it's only because of Pirelli is affraid their tires won't hold up, as they don't want to develop new tires for 2021.

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jjn9128
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Re: New 2021 rules

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Holm86 wrote:
Thu May 28, 2020 9:52 am
As far as I know, it's only because of Pirelli is affraid their tires won't hold up, as they don't want to develop new tires for 2021.
While I'm normally first to criticise Pirelli they were expecting to shift to 18" next year so investing heavily for another year of 13" seems daft especially as teams are being forced to keep their chassis' to save costs. This will lose around the equivalent downforce that they'd normally gain by next year, so for tyre loads the status quo is maintained.
#aerogandalf
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Holm86
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Re: New 2021 rules

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jjn9128 wrote:
Thu May 28, 2020 10:23 am
Holm86 wrote:
Thu May 28, 2020 9:52 am
As far as I know, it's only because of Pirelli is affraid their tires won't hold up, as they don't want to develop new tires for 2021.
While I'm normally first to criticise Pirelli they were expecting to shift to 18" next year so investing heavily for another year of 13" seems daft especially as teams are being forced to keep their chassis' to save costs. This will lose around the equivalent downforce that they'd normally gain by next year, so for tyre loads the status quo is maintained.
I agree that developing new tires would be stupid, but I would still criticise Pirelli for making a tire that can't handle the added downforce of completely stable regulations, they already have to regulate camber and tire pressure for their tires to hold up.

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jjn9128
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Re: New 2021 rules

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tbh they couldn't cope with the pre-2017 levels of downforce 😂
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"There is one big friend. It is downforce. And once you have this it’s a big mate and it’s helping a lot." Robert Kubica

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JordanMugen
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Re: New 2021 rules

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jjn9128 wrote:
Thu May 28, 2020 10:23 am
This will lose around the equivalent downforce that they'd normally gain by next year
The losses are expected to be greatest in high speed corners according to FIA.

Will this trimmed floor create unintentional high speed rear-end stability issues for nearly everbody (similar to 2019 Renault & 2018 McLaren)? It would be most amusing if it did. :lol:

Can we expected the trimmed floor to disproportionately disadvantage high-rake teams, and enhance Mercedes advantage with their more consistent low-rake car?

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Re: New 2021 rules

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JordanMugen wrote:
Thu May 28, 2020 5:13 pm
jjn9128 wrote:
Thu May 28, 2020 10:23 am
This will lose around the equivalent downforce that they'd normally gain by next year
The losses are expected to be greatest in high speed corners according to FIA.

Will this trimmed floor create unintentional high speed rear-end stability issues for nearly everbody (similar to 2019 Renault & 2018 McLaren)? It would be most amusing if it did. :lol:

Can we expected the trimmed floor to disproportionately disadvantage high-rake teams, and enhance Mercedes advantage with their more consistent low-rake car?
I presume it will limit the way teams seal the floor, so yes... but, we don't know how much a team like RedBull (who's cars generally have the most rake and I think started this whole thing) rely on the slots on the edge of the floor.

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godlameroso
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Re: New 2021 rules

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It will have no effect on lap times. All it will do is increase drag. No change in downforce as changes to the cars will negate the small loss. There will be more air smacking the rear tire, instead of it being channeled underneath and to the side. It does offer a clearer shot of guiding air over the diffuser.

Luckily teams are stuck with this year's rear end for next year, so whoever has the best rear end this year will keep the advantage next year.
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Re: New 2021 rules

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Wouldn't that be Mercedes then? With their new rear suspension layout, they have the cleanest access to the diffuser.

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Holm86
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Re: New 2021 rules

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godlameroso wrote:
Fri Jun 05, 2020 6:08 pm
It will have no effect on lap times. All it will do is increase drag. No change in downforce as changes to the cars will negate the small loss. There will be more air smacking the rear tire, instead of it being channeled underneath and to the side. It does offer a clearer shot of guiding air over the diffuser.

Luckily teams are stuck with this year's rear end for next year, so whoever has the best rear end this year will keep the advantage next year.
You really think it'll be this miniscule?? I think the taper will spill alot more of high pressure air from the top of the floor into the underfloor. Making very hard to seal a high rake diffuser

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godlameroso
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Re: New 2021 rules

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The current floor actually creates a down and outwash in front of the rear tire. It attempts to simulate outwash at the front. By tapering the floor, you lose that so the turbulence of the tire(which is speed dependent) is greater creating more drag. Remember that most cars are set up to squat at high speeds.

Teams will have to find a new cross over point and will have to tune the rake at different speeds to get the most of the new style floor. However once they do that, they'll find it doesn't decrease downforce too much.

It may shake things up in the first 1/4th of the season while teams get on top of it.
The height of cultivation is really nothing special. It is merely simplicity; the ability to express the utmost with the minimum. Mr.Lee

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Holm86
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Re: New 2021 rules

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godlameroso wrote:
Sat Jun 06, 2020 2:16 pm
The current floor actually creates a down and outwash in front of the rear tire. It attempts to simulate outwash at the front. By tapering the floor, you lose that so the turbulence of the tire(which is speed dependent) is greater creating more drag. Remember that most cars are set up to squat at high speeds.

Teams will have to find a new cross over point and will have to tune the rake at different speeds to get the most of the new style floor. However once they do that, they'll find it doesn't decrease downforce too much.

It may shake things up in the first 1/4th of the season while teams get on top of it.
The outwash is not as much about drag as it is about pulling the tire squirt outboard of the rear tires. When this is removed much of the tire squirt will go on the inside, into the diffuser making it less efficient

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godlameroso
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Re: New 2021 rules

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Some still goes inside now. Luckily they're allowing 2 small fences on the floor to channel air. I still think there won't be much difference in lap time. Pouhon will still be flat. Plus more turbulence caused by the rear tires are certain to produce more drag. That's not a bad thing, more powerful slip stream.
The height of cultivation is really nothing special. It is merely simplicity; the ability to express the utmost with the minimum. Mr.Lee

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mclaren111
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Re: New 2021 rules

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godlameroso wrote:
Fri Jun 05, 2020 6:08 pm
It will have no effect on lap times. All it will do is increase drag. No change in downforce as changes to the cars will negate the small loss. There will be more air smacking the rear tire, instead of it being channeled underneath and to the side. It does offer a clearer shot of guiding air over the diffuser.

Luckily teams are stuck with this year's rear end for next year, so whoever has the best rear end this year will keep the advantage next year.
Except McLaren changing to Merc PU...