Volkhart V2 Sagitta & Cd 0.16

[aerohead]

Over the last week this crossed the forum. I can't locate it, so I'll treat it out in the open where it won't get lost.
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* The Sagitta, Porsche Type-64 60K10 Berlin-Rome, and Porsche 911 are all considered derivatives of the 1938, 'Lange' car, developed under the direction of Dr. Ludwig Prandtl, at the A.V.A. Gottingen, in Germany.
* The 'Lange' car is a Jaray, 'combination form' design, with lower main body, and upper symmetrical wingtip greenhouse glommed on.
* The greenhouse is designed to create as much flow besides , as is flowing over, and is 100% boat-tailed.
* The greenhouse also requires a panoramic, full, wrap-around, semi-circular windscreen.
* The 'Lange' car is very narrow, L / W = 2.781.
* It's fineness ratio is L /H = 3.576.
* Verjung. = 1.934.
* 'Lange' measured a featureless, smooth, model of the car at the AVA and recorded Cd 0.14.
* Later, Hucho and his co-workers at Volkswagen recorded Cd 0.16, on a 1 / 5 -scale, featureless model of the car.
* In SAE Paper 860216, Aerodynamic Characteristics of Subaru XT, T. Tsukada et al., Subaru Engineering Division, Fuji Heavy Industries, Limited, reported that in their history of 1 / 5-scale model testing, that results were within 97% accuracy, compared to the associated actual production vehicles.
* It may be Hucho's measurement which has been attributed to the Sagitta.
* The Porsche 60K10 has been reproduced, and wind tunnel tested, however the owners have not yet published the Cd.
* Neither the 60K10 , Sagitta, nor 911 share the more liberal dimensional attributes of the actual 'Lange' car.
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* The 2002 Volkswagen 1-Liter Car is a 'Lange' car derivative, with Cd 0.159, lacking front wheel skirts.
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Honk if You Have a Small One!

[kach22i]

I need pretty pictures - sorry.

Found an old 2016 post of yours.

Lange car
https://ecomodder.com/forum/showthre...e-33673-6.html

Originally Posted by aerohead

I think that this is the Lange car which inspired the early Porsche sports cars,like the 60K10 which Ferdinand drove between Stuttgart and Berlin before the war.

To the Cd 0.14-16 featureless,smooth model,we'd have to add in all the features drag,interference drag,drag due to lift,cooling system drag,etc..
Also,if you look at the Lange car in plan view,it has extreme plan taper,nearly from the front of the car.Never done in the production cars.


The Volkhart Sagitta V2 is very similar to the Lange body.Cd 0.21.

[aerohead]

Wow! I'm surprised how much of the images photobucket is allowing.

[kach22i]

Originally Posted by aerohead

Wow! I'm surprised how much of the images photobucket is allowing.

Like the early days of scrambled porn on cable TV, just enough to spur your interest with that trickle of audio.

[freebeard]

I need pretty pictures - sorry.

I raided my albums. Tatraplan, XL Sport concept, and Ganz. The last one is a bit of a stretch.

[Yippeekyaa]

https://youtu.be/HaDWPBco07w

[freebeard]

Whenever I see a modern car where the aerodynamic shape has been hollowed out and vented, like the Aston Martin Valkyrie, I imagine what the details would look like transferred to the Volkhart-Sagitta general shape. Comes now the Bugatti whatever-this-is:



https://justacarguy.blogspot.com/202...r-frankly.html

Shrunk to four-passenger economy car size the front semi-pontoon fenders would be more pronounced and the cabin would be expanded. But the four-skirted slab sides could be replaced by the turbine wheels and vented wheelwells. The wing is unneeded and the single air intake snorkel would be adequate for an economy engine.

[Stubby79]

Originally Posted by freebeard

Whenever I see a modern car where the aerodynamic shape has been hollowed out and vented, like the Aston Martin Valkyrie, I imagine what the details would look like transferred to the Volkhart-Sagitta general shape. ...

Drat! You've gone and put ideas in my head!

Oh gawd, here comes another one!

[Vman455]

Originally Posted by aerohead

* It may be Hucho's measurement which has been attributed to the Sagitta.

Just to correct this: According to VW, the cD = 0.160 value is not Hucho's measurement of a featureless model, it was published in contemporary sources--

The cw value of 0.160 mentioned in contemporary magazines at the beginning of the 1950s was a product of a very vivid imagination.

[aerohead]

Originally Posted by Vman455

Just to correct this: According to VW, the cD = 0.160 value is not Hucho's measurement of a featureless model, it was published in contemporary sources--

Can you expand on your Volkswagen data please?
In Hucho's 2nd-Edition, page 18, Hucho wrote: ' Measurements performed by the author and his co- workers on a one-fifth scale ( Lange car ) model approximately confirmed this value with 0.16.'
Thanks in advance.