windshield

[muffildy]

found the buick riviera has a really nice looking rear glass
problem is i cant seem to find any information on the dimensions of it so i dont know if it will even fit.
also, cant find anyplace that sells it in particular except ebay.

[botsapper]

Recommend cleaning up the trailing flow...and it'll look way cooler!

http://pic90.picturetrail.com/VOL237.../387846677.jpg

http://www.paul-davis.com/vehicles/miata/fasback.jpg

http://lh5.ggpht.com/_e9GW4M7g5Rk/Sv...miatalhMOD.JPG

http://www.autokonexion.com/images/f...epic%20589.jpg

[euromodder]

Originally Posted by Frank Lee

The angle of the hood/windshield has no influence over the angle of the windshield/roof.

If the hood/windshield angle is altered by angling the windshield, then it definitely does.

The ws/roof junction is the important one, and angle has less to do with it than how generous the radius at the junction is.

A shallow transition angle makes it far easier to generously radius the junction.

[botsapper]

Instead of an angle change, modders easily chops the glass and lowers overall frontal area.
Even at SEMA 2011, they chopped the windshield for a Spyder concept.
http://www.autoevolution.com/images/...y-medium_4.jpg

[euromodder]

Originally Posted by kach22i

How about an equally angled hood leading to the windshield?

A way to get closer to the streamlining-template's bulbous nose shape.
The Previa ruins it through sheer size and its rear though.

On the Prius and Insight, Mercedes A and B, ... the angle between hood and windshield is also minimal.

[California98Civic]

Originally Posted by euromodder

If the hood/windshield angle is altered by angling the windshield, then it definitely does.


A shallow transition angle makes it far easier to generously radius the junction.

This would explain the design changes to the hood, windshield, roof design across the Prius generations?

First:


Third (latest):


james

[aerohead]

Originally Posted by CFECO

Rumpler, .28 so? It follows your template in plan view, if it was template in side view, it would be really something.

"If the flow is decent as far back as the A-pillars/windshield header it doesn't matter what's going on ahead of them."

Prove it. Vertical flat plate with template rear = full template, I don't think so.

I have a complete analysis of the Rumpler car.I'll try and remember to snag it.

[aerohead]

Originally Posted by muffildy

found the buick riviera has a really nice looking rear glass
problem is i cant seem to find any information on the dimensions of it so i dont know if it will even fit.
also, cant find anyplace that sells it in particular except ebay.

That glass won't pass a state safety inspection.Whatever you choose,it must be laminated safety glass and it must be etched to say so.

[aerohead]

Originally Posted by CFECO

Rumpler, .28 so? It follows your template in plan view, if it was template in side view, it would be really something.

"If the flow is decent as far back as the A-pillars/windshield header it doesn't matter what's going on ahead of them."

Prove it. Vertical flat plate with template rear = full template, I don't think so.

The Rumpler Tropfen-Auto was produced as an open touring car in 1921,with Cd 0.54,and an enclosed limousine in 1924,with Cd 0.28( as measured in VW's modern tunnel.
A plan-view of the car appears in Baron Fachsenfeld's book of 1951.
The body is relying on a 2-D type of flow with the air going primarily around the body rather than over.
The body itself is a 3.044:1 streamline section with 100% aft-body.
*At maximum body camber point the tangent angle is of course zero.
*At 10% aft-body length the tangent angle is 4.5-degrees.
*At 20% aft-body 8.5-degrees.
*At 30% aft-body 14-degrees.
*And from there on to the terminus the tail maintains a 14-degree angle.
--------------------------------------------------------------------------
The roof in plan-view is a 2.164:1 streamline section of 0.89-width forebody and 1.27-width aft-body.
I've not put a protractor to the roof although the rear curvature is quite aggressive and just looking at the image I would presume the flow is separating by the rear axle centerline.
Flow over the roof is very good.It has a familiar architecture.
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I believe that a 3.92:1 section has the lowest Cd in 2-D flow.And little is published about 'cars' based on sections.They are more like inverted boat hulls or wingtips than sections.
--------------------------------------------------------------------------
At Cd 0.28 the car was remarkable for its day however when compared to Jaray's 'pumpkin seed' of 1921 @ Cd 0.13,we have a better path to follow.

[California98Civic]

Originally Posted by aerohead

The Rumpler Tropfen-Auto was produced as an open touring car in 1921,with Cd 0.54,and an enclosed limousine in 1924,with Cd 0.28( as measured in VW's modern tunnel.

Here the 1924 enclosed limousine, I believe:



Not so good over the top, is it. But most air, as you said went around the side. Maybe that was much cleaner, given the shapes.

james