PORSCHE 60K10 at A2 Wind Tunnel

[aerohead]

At this site, at the 17th image from top is a good resolution photo of this hand-built recreation of the iconic Porsche, undergoing testing in Mooresville, North Carolina.
My impression from the smoke is that, as with it's 1947, Volkhart V2 Sagitta cousin, the centerline flow cannot remain over the steeply sloped roofline.
T64 Coming to the 36hp Challenge

[aerohead]

3rd from top shows flow separation off rear slope
https://bugazine.com/2013/03/26/reko...gen-windkanal/

[freebeard]

It sounds like lawyers got involved in 2018.

I can't find a good search criterion, but wasn't there a race car recently that had a distinct concavity on the tail to get downforce without a wing? Wasn't it French?

[aerohead]

Originally Posted by freebeard

It sounds like lawyers got involved in 2018.

I can't find a good search criterion, but wasn't there a race car recently that had a distinct concavity on the tail to get downforce without a wing? Wasn't it French?

Other than record cars and the human-powered record bikes at Battle Mountain, I've been pretty active about ignoring race technology altogether and typically avoid participation on threads where it does come up.
There's little apparent applicability with respect to passenger cars. I thought we would have given it all up back in 1973.
aerohead, curmudgeon in training
'Don't wake me!'
'Honk if you have a small one.'

[Autobahnschleicher]

Originally Posted by aerohead

3rd from top shows flow separation off rear slope
https://bugazine.com/2013/03/26/reko...gen-windkanal/

It does indeed seperate, but still a CD of 0,217 is awesome.
Given a frontal area of 2,1 m², that's a CDA of 0,4557 and beats a 1st gen insight, wich has 0,465.
Even my car with its much smaller frontal area only gets a CDA of 0,528 in stock condition.
(ragtop, hardtop probably a little less)

[kach22i]

Originally Posted by Autobahnschleicher

It does indeed seperate, but still a CD of 0,217 is awesome............

I agree, and from what I've been getting out of some old threads is the idea that the closer to the attached form a shape is, the better the Cd, separation or not.

From the opening link provided:
http://cal-look.no/lounge/index.php?topic=25766.0

The Type 64 tribute car is finished and race ready.

The results of the Team Versuchwagen Type 64's A2 Wind Tunnel test were spectacular and verified the aero efficiencies of Kommendas original sketches. And some surprises as well. In the tunnel, the vehicles tires are placed on top of sensitive computer connected electronic scales mounted under the floor which record variations in pressure as air flows over, under and around the body at various wind speeds. The biggest surprise (lesson?) came when improvement was found by removing the Copacetic Metal Shaping fabricated full belly pan along with the rear fender skirts/spats. This combination provided the most stable pressures at higher air flow speeds. It was determined the rear skirts/spats added 50 pounds of lift to the rear! It was also determined that installing a 4 3/4 inch tall perfectly vertical spoiler at the rear deck lid area would actually reduce lift, add stability "and reduce drag" making higher speeds possible without increasing horsepower. There is no front splitter, air dam or spoiler. The wind tunnel engineer running the tests indicated he had never seen such a early example of aerodynamics prove so successful. Kudos to Erwin Kommendas foresight and natural aero expertise.

Too bad about the rear wheel covers.

I'd like to see a photo of that vertical spoiler, looked for it but have yet to find it.

I did find the following.

Reply #11, 3rd image - the underbelly - aft
Re: T64 Coming to the 36hp Challenge
https://www.landracing.com/forum/ind...?topic=15621.0