McMurtry Speirling

[johnny comelately]

The reason for the wings is fairly adequately explained in the video link at the start of the thread.
Initially designed as a track day car, following feedback from pro-level drivers the wing boosts stability at high cornering speeds.
The bodywork was initially designed for low drag (relying on the suction for grip).
Suction can be run at max from 0mph.

Sadly the video commentary is amateurish, Stu - case in point - it is claimed later on during the vid that downforce via
suction is variable, so the wing isn't required, & it can also be seen (in wet airflow) - the 'diffuser' - is non-functional.

Totally agree on the diffuser.

The big take-away from the video that I found was the tiny size of the suction area.
If doing something similar I would mount the suction ‘collector’ from the hubs/lower wishbones (such that only the wheels tyres saw the load), allowing for more refined body control.

When I was at Uni I investigated the possibility of shaping wheel rim spokes for extraction, which could be ducted to a sealed section at either axle. Downside was that it would be totally speed sensitive (although nowadays they could be wirelessly controlled to reduce that sensitivity - or even close them off). A bigger downside was the lack of a wind-tunnel….
CFD wasn’t an option, the internet hadn’t yet been made public & email communication was limited to educational & research establishments.

Way back in the last millenia the F1 circular wheel holes were designed to extract air outwardly.

[Dernie Ecclestone]

The reason for the wings is fairly adequately explained in the video link at the start of the thread.
Initially designed as a track day car, following feedback from pro-level drivers the wing boosts stability at high cornering speeds.
The bodywork was initially designed for low drag (relying on the suction for grip).
Suction can be run at max from 0mph.

Sadly the video commentary is amateurish, Stu - case in point - it is claimed later on during the vid that downforce via
suction is variable, so the wing isn't required, & it can also be seen (in wet airflow) - the 'diffuser' - is non-functional.

Totally agree on the diffuser.

The big take-away from the video that I found was the tiny size of the suction area.
If doing something similar I would mount the suction ‘collector’ from the hubs/lower wishbones (such that only the wheels tyres saw the load), allowing for more refined body control.

When I was at Uni I investigated the possibility of shaping wheel rim spokes for extraction, which could be ducted to a sealed section at either axle. Downside was that it would be totally speed sensitive (although nowadays they could be wirelessly controlled to reduce that sensitivity - or even close them off). A bigger downside was the lack of a wind-tunnel….
CFD wasn’t an option, the internet hadn’t yet been made public & email communication was limited to educational & research establishments.

Depends on how the suction envelope is shaped. Newey's video game cars had both a functional diffuser and suction fan. Likely this McMurtry does as well. Given that, for whatever styling is may have, most of its shape seems purposeful. The drawing in that video was only explanatory, not depicting any real shape.

[Stu]

When I was at Uni I investigated the possibility of shaping wheel rim spokes for extraction, which could be ducted to a sealed section at either axle. Downside was that it would be totally speed sensitive (although nowadays they could be wirelessly controlled to reduce that sensitivity - or even close them off). A bigger downside was the lack of a wind-tunnel….
CFD wasn’t an option, the internet hadn’t yet been made public & email communication was limited to educational & research establishments.

Way back in the last millenia the F1 circular wheel holes were designed to extract air outwardly.

I was doing this back in late-80’s.

[Andres125sx]

^ All you have to do Andres, is look at the winged Chaparral # 1, in the same photo as the fan/suction # 66 car,
both utilize air-pressure downforce, one being pushed down, the other is pulled down, how do you not get that?

Not surprising from you, ignoring the questions when you have no reply, and moving the goalposts... Do you think that #66 fan car has any engineering work to reduce drag? Or since it was the very first suction car they focused on the fan and sealing the floor?

You´re constantly comparing apples to oranges, then critizicing they´re different


Looks like if you think a picture of a 70s 80s car proves the purpose (or not) of a car designed 50 years later. Sorry but no, it proves nothing

[gruntguru]

The Sperling has a rear wing only - added to shift the DF balance rearward at high speed. The fan concept intrinsically has the same F-R downforce balance at all speeds and modification required to shift it at speed would be much more complex than the simple addition of a rear wing.

[J.A.W.]

The Sperling has a rear wing only - added to shift the DF balance rearward at high speed. The fan concept intrinsically has the same F-R downforce balance at all speeds and modification required to shift it at speed would be much more complex than the simple addition of a rear wing.

The seemingly simplistic addition of a 'dumb' (& drag inducing) external airstream rear wing appears
to confirm a 'primitive' approach - since even if suction-zone downforce area vectoring is too "complex",
then surely, a fan-efflux vent 'blown' wing certainly should be feasible - esp' given the non-functional
'diffuser' situation - which is currently demonstrated to be ah, 'over-blown'...

[Andres125sx]

For what reason exactly they should blow the wing? It can corner at 3G even in slow corners, something I´ve only seen in the Valkirie, but only in fast corners while the McMurty can do 3G even in hairpins so for what reason exactly they should re-design the car completely from scratch to implement a blown wing?

Maybe for mkII that will be a good idea, but right now, even without a blown wing, this is problably the fastest car ever, at least for one lap as at those power levels the battery can´t last long. But with current design they simply don´t need anything more to wipe the floor with any competitor on a fast lap. That´s something I´d say

Even so you can only critizice it from any point of view you can imagine, at first you directly said it sucks, then you said the styling has no purpose, then it´s toy-like, now the wing is primitive and simplistic... We got it JAW, you don´t like it, as any other EV. No need to repeat it on every single page of the thread. With that attitude and insistence someone might thing you´re just trolling

[vorticism]

It has similar proportions to another compact EV time trial special, the Tajima E-Runner, which ran Pikes Peak. The Spierling seems ideal for either a Nordscheife or Pikes Peak run.

[johnny comelately]

From the lady who had that brilliant interview with Nigel Mansell, Maximus Chiltonus and the new fact that the footprint of this devil is the same as the Formula One cars of the 1960's

[Holm86]

From the lady who had that brilliant interview with Nigel Mansell, Maximus Chiltonus and the new fact that the footprint of this devil is the same as the Formula One cars of the 1960's

"The Lady" is former top model Jodie Kidd She's pretty cool

[johnny comelately]

From the lady who had that brilliant interview with Nigel Mansell, Maximus Chiltonus and the new fact that the footprint of this devil is the same as the Formula One cars of the 1960's

"The Lady" is former top model Jodie Kidd She's pretty cool
https://www.independent.ie/incoming/df2 ... 383382.jpg

Your temperature apparatus needs recalibrating

[johnny comelately]

[AR3-GP]

Insane.

[Andres125sx]

Insane for any hypercar, but when you notice it´s RWD....


So we can safely say this is the fastest car in the planet, right?

[johnny comelately]

Insane for any hypercar, but when you notice it´s RWD....


So we can safely say this is the fastest car in the planet, right?

That should be their advertising slogan !