Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com

EcoModder.com (https://ecomodder.com/forum/)

- Aerodynamics (https://ecomodder.com/forum/aerodynamics.html)

- - 1923 Persu Streamliner (https://ecomodder.com/forum/showthread.php/1923-persu-streamliner-12319.html)

1923 Persu Streamliner

From the wik:

Quote:

Aurel Persu (1890-1977), was a Romanian engineer, and among the first to apply aerodynamics principles to automobiles. He came to the conclusion that the perfectly aerodynamic automobile has the shape of a falling water-drop.
Persu implemented his idea in 1922-1923 in Berlin, building an automobile that could reach very high speeds for that time, and it could take curves at up to 60 km/h. It was the first car to have the wheels inside its aerodynamic line, which we take for granted today. The car ran for 160,000 km and can be seen since 1961 in the "Dimitrie Leonida" Technical Museum [1] in Bucharest. The car is still working today.

http://www.shorey.net/Auto/Eastern%2...0(Romania).jpg

http://4.bp.blogspot.com/_TS-xzb12aS...mousine_cr.jpg

http://autoturism.rdslink.ro/persu.gif

Very weird-looking and unfunctional by today's standards, but quite nice in the eye of an ecomodder.

On the second and third pictures, notice the little shade/visor above the driver's side windshield. That must have killed airflow.

Certainly not what you might call an aesthetic success.

The shape of raindrops is dominated by surface tension. They are egg-shaped, without long, streamlined tails. Water drops running down a surface are probably the source of the analogy.

Hucho referred to this car as the first ever based on a streamline body of revolution.The performance speaks for itself.
My first glimpse of this car.Thank you mucho!

Quote:

Originally Posted by Piwoslaw (Post 161478)

On the second and third pictures, notice the little shade/visor above the driver's side windshield. That must have killed airflow.

I wonder if that was "poor mans air conditioning"?

Bicycle Bob -

Quote:

Originally Posted by Bicycle Bob (Post 161509)

The shape of raindrops is dominated by surface tension. They are egg-shaped, without long, streamlined tails. Water drops running down a surface are probably the source of the analogy.

Yes and no. I said the same thing to my Dad, and he went through an extensive proof that the surface tension turns raindrops into spheres when they are on their own :

http://comps.fotosearch.com/comp/CSP..._~k0207062.jpg

I agree with the analogy, though. Our artistic interpretation of rain is as lines. Also, I think that's what cameras can see, the "streak" of the falling raindrop :

http://comps.fotosearch.com/bigcomps...07/pr80499.jpg

CarloSW2

Looks like it would be the Ambiguously Gay Duo's truck

I also noticed that the distance between the rear wheels seems to be half that of the front wheels. It's almost a trike!

Quote:

Originally Posted by Piwoslaw (Post 161478)

That the opening front window slot, can be seen on the original photo too. One question I have, did the front lights swivel too ?

...love the "aero" wheel covers!

...and, yes, to my eyes, it looks like the headlights swiveled with the wheels.

Car Bibles : The Hybrids Bible
http://www.carbibles.com/images/aurelpersu.jpg

Quote:

Did Citroën really get there first?

The Aurel Persu car
For the history buffs, here's a nugget of trivia : Romanian engineer Aurel Perşu actually came to the conclusion that the teardrop was the best shape in 1922 and built a vehicle to prove it. He patented the shape in 1924 and both Ford and GM expressed an interest in buying the patent at the time, but since they didn't want to commit to also building the car, Perşu refused their offers. That vehicle had a drag coefficient of 0.22 - lower than most vehicles today - and it's still fully functional and on display at the Romanian National Technical Museum in Bucharest. Since 2006, the museum has awarded an annual Aurel Perşu Aerodymanic Automobile prize to the car manufacturer that produced a vehicle in the previous model year with a drag coefficient lower than 0.3. In 2006 the Mercedes S-Class took the prize and in 2007 the prize was given to Toyota Corolla.

Read more: http://www.carbibles.com/hybrids_bib...#ixzz2hNHPqFbo