Mirror designs, if we can't use cameras yet.

[aerohead]

Here is an interesting CFD and wind tunnel study of 'passive jet' mirrors.
Results are a bit quirky,and some off-car testing (which is a no-no) but interesting!http://www6.miami.edu/acfdlab/public...14-01-0584.pdf

[2000mc]

Sweet
*starts holding up various sizes of hole saws to side mirror*

[UltArc]

Originally Posted by Baltothewolf

Is it illegal to use cameras in place of sideview mirrors?

Law section

[freebeard]

Thanks,aerohead, that's awesome.

The MacLaren mirror reminded me of the funnels on the decks of old steamships.

So the 39% improvement was from the simulation? Maybe that would be supported or improved with some fine-scale refinement:



I'm wondering about a blown or molded clear plastic cap on a 3" peep mirror. It needs more testing in the second configuration.

Edit: Nope, I checked. The swan-necked swivel mount would have to go. An annular ring might replace it, swiveling in a fixed mount.

[NeilBlanchard]

The best possible solution I can think of for an optical mirror would be to have a "half teardrop" blister in the side window, that lets the mirror be positioned out beyond the side of the car, and has a tapered form behind the mirror that allows smooth attached air flow.

This kinda' messes up an chances of having (much?) of the side window be operable, though.

[Vekke]

You mean like this?.



My mirror was also wented to driver to get cool air.

[aerohead]

Originally Posted by freebeard

Thanks,aerohead, that's awesome.

The MacLaren mirror reminded me of the funnels on the decks of old steamships.

So the 39% improvement was from the simulation? Maybe that would be supported or improved with some fine-scale refinement:



I'm wondering about a blown or molded clear plastic cap on a 3" peep mirror. It needs more testing in the second configuration.

Edit: Nope, I checked. The swan-necked swivel mount would have to go. An annular ring might replace it, swiveling in a fixed mount.

*The wind tunnel numbers did not correlate at all with the CFD results.
*The difference in drag between CFD and wind tunnel did fit.
*One observation:the body of the mirror is investigated without its attachment structure.
*The second observation:The mirror is investigated divorced from the host vehicle and no 'interference drag' investigation is presented.
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*For us,only meaningful data would have been provided if all testing were done with the mirror/car combination.
*We're left to speculate on what might happen when the passive-jet mirror is 'ON' the car.
*Also,since the jet is annular,the mirror mount cannot intrude within the mirrors main body,otherwise it corrupts the internal flow.Any adjusting mechanism,or turn signal electricals would not be permitted within the cavity.
*And since the mirror WILL be mounted 'somehow' to the car,the mount itself will affect the jet behind it.
*This being the case,the internal ducting and flow may need to be asymmetrical and 'tuned' such that the emerging jet functions as in the isolated flow study.
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I really like what they've done,but another,deeper investigation needs to be made,investigating the technology as an aerodynamic 'system' of mirror and host vehicle together.

[aerohead]

The full-race version of the 911 GT moved the mirrors way ahead of the A-pillars to get them into slower air,and they encased them in long,higher fineness ratio housings,kinda like Mair's wind tunnel model.These mirrors might have something on the order of Cd 0.20,excluding the mounting struts.
http://www.porsche-mania.com/wp-cont...he-911-GT1.jpg
Here is Mair's 'template' with the cylindrical elongation removed

[Smokeduv]

I know it's not the right thing to do, but, can you use cameras on the sides, with a very slim case, but with a double-sided mirror so the camera is behind it? That way you can comply with the regulations and have a very slim sidemirror, as you will have camera displays on board

[NeilBlanchard]

The SIM-LEI used a minimized optical mirror and a camera: