Aero versus Windscreen

[Ian Mackenzie]

Some nice data here of a couple of runs for comparison: 

https://www.locostbuilders.co.uk/viewthread.php?tid=208938

Cheers

Ian

[Jonathan Kay]

Yes, good to see the experiment run, but, as a responder noted, it's hard to interpret without repeat runs in the same configuration.

I can't see the site now because it's blocked me: what are the flat-out speeds? They didn't look sufficiently different.

Jonathan

[DougBaker]

I hope it will help someone in making decisions :-) especially on trackdays ...

 

max speed with windscreen was 205 kmh (127 mph)

 

max speed without windscreen was 216 kmh (134 mph)

[mossy7]

It's interesting none the less. It shows no real difference until about 100mph . I had imagined the difference would be noticed at lower speeds, say 60 +mph. Since the national speed limit is 60 for single carriageways...oh hum....... 

[Tony Whitley]

There is a noticeable difference on motorways*; with the windscreen taking my foot off the accelerator is enough to slow down sharply, with the aero the car sails on and I have to use the brakes.

* at a lot less than 100 MPH

[Tony Whitley]

[Jonathan Kay]

Thanks, Tony.

Those curves don't look compatible with the subjective experiences.

Jonathan