RAM air Aero Tube

[aerohead]

Originally Posted by Blacktree

This conversation is getting confusing. Are we talking about drawing air from the stagnation zone in front of the car, or from underneath? Are we talking about running ductwork through the vehicle, or adding a second floor?

Also, I have no idea what a Baumann scoop is. I tried an internet search, and google showed me a bunch of kitchenware.

A) Tahoe Hybrid designates the conditions of systems operational environment in #1 ( permalink ) on page-1
B) He's talking about pulling air from under the Tahoe, ducting it 'through' the interior of the Tahoe, and releasing it into the wake.
C) As it's never been expressly revealed, I'm under the impression that 'Baumann' had to do with the scoop used under the North American P-51 Mustang WW-II fighter aircraft, or some NAZI aircraft of that era.
It's been mentioned in HOT ROD MAGAZINE, and what's shown matches that of the P-51, and is also shown in Sighard Hoerner's 1951 book ' AERODYNAMICS. Hoerner designed warplanes for Messerschmitt.
D)The 'Baumann' scoop appears at the bottom of Fig. 10.4. 'Shape of Various air scoops' ( 10.26 )., page 189.
E) One must cast a wide net to capture actionable information necessary for streamlining, something Wolf Heinrich Hucho expressed to readers of his 2nd Edition book.
F) For some things the internet remains worthless.

[freebeard]

• It's still page 1 for me.
• The wording is ambiguous --airdam to underneath.
• duckduckgo.com/?q=Baumann+scoop&ia=web Knock yerself out

Currently, my fav airframe is the Piaggio P-119:


www.destinationsjourney.com/historical-military-photographs/piaggio-p-119-italian-fighter/

Mid-engined like an Aircobra with a radial engine. Two ever built.

[aerohead]

Originally Posted by freebeard

• It's still page 1 for me.
• The wording is ambiguous --airdam to underneath.
• duckduckgo.com/?q=Baumann+scoop&ia=web Knock yerself out

Currently, my fav airframe is the Piaggio P-119:


www.destinationsjourney.com/historical-military-photographs/piaggio-p-119-italian-fighter/

Mid-engined like an Aircobra with a radial engine. Two ever built.

'...from under the car...'
'airdam to underneath' is not in the preamble.

[Blacktree]

Originally Posted by freebeard

• It's still page 1 for me.
• The wording is ambiguous --airdam to underneath.
• duckduckgo.com/?q=Baumann+scoop&ia=web Knock yerself out

Even the DuckDuckGo link shows kitchenware... LOL.

I'm familiar with the "cooling pods" on those airplanes. But IIRC, they make use of the Meredith Effect. Not quite the same as what the OP is trying to do.

[freebeard]

That was the point.

It was used as an example for the inlet, The duct was actually a ring shape, with cowl flaps just like other radials. In the picture they're open, behind the removed access panels.

FW-190 used Meredith effect but didn't have the blistered cooler. IIRC. Piaggio was more similar to the Shauberger Trout Turbine, venting at the widest part of the body where the air is moving fastest.

[aerohead]

My archive produced some data germane to this concept.
Only a few vehicles have ever had their pressure profiles measured and reported, or tests conducted which would illustrate any propensity for passive flow conduction.
* John Simonson's 188-mph 1953 Studebaker land speed record car incorporated rear quarter-panel-to-wake ducting, below the taillights, however no quanta has ever been provided as to the efficacy of the modification.
* Simonson's car also harvested underbody flow, via six, mandrel-bent tubes, which passed upwards 'through' the body, to under the backlight, ostensibly for drag and lift reduction.
* Simonson also tapped engine bay air at the transmission hump, and ducted it horizontally, through the cabin, exiting behind the doors.
* Dr. Alberto Morelli and Sergio Pininfarina's, 1961 Ferrari 250 GT indicated for flow reversion, a fail.
* The 1971 Lamborghini Countach LP-500 prototype demonstrated flow reversion, a fail.
* The 1973 Dodge van failed a drag reduction, under the most optimistic conditions of 100% forward stagnation pressure impelling the duct flow.
* The 1984-1987 Honda CRX produced flow reversion, a fail.
* The 2000- on, 1st-gen Honda Insight indicated for flow reversion, a fail.
* The 2018 Jaguar XE indicated for flow reversion, a fail. In order to move air from under the Jaguar to the wake, an 800% pressure rise would have to be overcome.
* Dr. Robert Englar, of Georgia Tech University's Research Institute has never been able to impel airflow without a powered prime mover.
--------------------------------------------------------------------------------------
I'm going to hold to my original recommendation, not to pursue the 'Aero Duct.'
I wouldn't waste any time taking pressure measurements either.
I consider the project dead-on-arrival.

[freebeard]

Can you I.D. the Ferrari I posted at Permalink #2? IIRC there were published figures for the delta.

[aerohead]

Originally Posted by freebeard

Can you I.D. the Ferrari I posted at Permalink #2? IIRC there were published figures for the delta.

I've made it a point to ignore race cars, so I'll be of no help on this one.

[freebeard]

Not a race car. It took three searches to drill down:


hwww.asphalte.ch/news/2013/07/ferrari-f12-berlinetta-road-test/6/

[aerohead]

One of their really-high-performance cars used high-pressure electric fans to blow into the car's base, from the taillight area, which allegedly 'detached' the wake.