SiLo wrote: ↑07 Jun 2022, 15:01I was speaking about the juts in the main part of the floor, like Golameroso posted with the surfboard. At higher speeds I assume they are detaching the flow in some way, you might be right that they are disturbing the flow through the venturi to stop porpoising.RGAEDA wrote: ↑06 Jun 2022, 16:35The wooden plank skid marks seem as if the load of the car shifts throughout the lap but the most probable thing is that the car could be hitting the bumps on the tarmac at different speeds and different angles.
Silo, going with your theory, could it be that the low-pressure zone under the car, created by those deep tunnel shapes in the middle keeps RB18 away from porpoising? I remember Kyle's(KYLE.ENGINEERS) youtube channel has a video where he mentions the tunnel height contributing to porpoising, I think he said something like a taller tunnel has much fewer chances of detaching the airflow.
Posted previously in the W13 thread:RGAEDA wrote: ↑06 Jun 2022, 16:35The wooden plank skid marks seem as if the load of the car shifts throughout the lap but the most probable thing is that the car could be hitting the bumps on the tarmac at different speeds and different angles.
Silo, going with your theory, could it be that the low-pressure zone under the car, created by those deep tunnel shapes in the middle keeps RB18 away from porpoising? I remember Kyle's(KYLE.ENGINEERS) youtube channel has a video where he mentions the tunnel height contributing to porpoising, I think he said something like a taller tunnel has much fewer chances of detaching the airflow.
Thanks! This is exactly what I was getting at.ing. wrote: ↑07 Jun 2022, 23:18SiLo wrote: ↑07 Jun 2022, 15:01I was speaking about the juts in the main part of the floor, like Golameroso posted with the surfboard. At higher speeds I assume they are detaching the flow in some way, you might be right that they are disturbing the flow through the venturi to stop porpoising.RGAEDA wrote: ↑06 Jun 2022, 16:35The wooden plank skid marks seem as if the load of the car shifts throughout the lap but the most probable thing is that the car could be hitting the bumps on the tarmac at different speeds and different angles.
Silo, going with your theory, could it be that the low-pressure zone under the car, created by those deep tunnel shapes in the middle keeps RB18 away from porpoising? I remember Kyle's(KYLE.ENGINEERS) youtube channel has a video where he mentions the tunnel height contributing to porpoising, I think he said something like a taller tunnel has much fewer chances of detaching the airflow.
Thanks, helps a bit to better understand the details.ing. wrote: ↑07 Jun 2022, 23:29Posted previously in the W13 thread:RGAEDA wrote: ↑06 Jun 2022, 16:35The wooden plank skid marks seem as if the load of the car shifts throughout the lap but the most probable thing is that the car could be hitting the bumps on the tarmac at different speeds and different angles.
Silo, going with your theory, could it be that the low-pressure zone under the car, created by those deep tunnel shapes in the middle keeps RB18 away from porpoising? I remember Kyle's(KYLE.ENGINEERS) youtube channel has a video where he mentions the tunnel height contributing to porpoising, I think he said something like a taller tunnel has much fewer chances of detaching the airflow.
Seems to me the roof of the RBR tunnels are very much arched in section whereas the Merc has a lower, wide and flat roof (in section) and also flat along a good portion of its chord.
The low, flat roof of the Merc would appear to make the flow more sensitive to ride height variations. At full bump, for example, the area will be reduced quite a bit more—assuming the width of the tunnels on both cars is similar. The Merc is turquoise and the RBR is purple:
https://i.imgur.com/MDt0t1K.jpg
With the Merc floor seeming to be flat along most of its chord ahead of the rear axle—as opposed to a more cambered wing-like profile—this would tend to make it more pitch and heave sensitive. As explained already by Migeot in the Autosport article, due to the cars having more suspension travel at the rear, heave displacement at full bump resembles a nose-down pitch attitude. With a flat floor, the throat moves aft and any blockage due to boundary layer build up would get exacerbated and so would affect total DF and CoP location. Front is —>
https://i.imgur.com/P8z35JL.jpg
This may explain why Merc have good numbers in the wind tunnel that don’t translate to results on track. Kind of like the extreme GE cars of the late ‘70s like the Lotus 80 and the Arrows A2.