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Old 01-23-2021, 03:45 PM   #21 (permalink)
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Anything above or below a wing is called a fence generically. Flaps are hinged things that deploy to alter airflow.

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Old 01-23-2021, 04:30 PM   #22 (permalink)
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Old 01-27-2021, 11:30 AM   #23 (permalink)
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blind in one eye, couldn't see out of other

Parked next to a Mirage last Sunday. Obviously, the actual rear hatch gap was clearly in the original photograph. My brain, somehow couldn't accept the fact that this gap could be so far ahead of the trailing edge, and dismissed it.
Apologize for confusion and Armadillo-vision.
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Old 01-31-2021, 06:09 PM   #24 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
Anything above or below a wing is called a fence generically. Flaps are hinged things that deploy to alter airflow.
Sorry, Wikipedia disagrees , wing fences are perpendicular to Gurney flaps , and developed for use on swept-wing aircraft that suffer from full span stall. Basically a full cord Vortex Generator.
Gurney flaps sole purpose is to give a simple basic flatish/concave shape a more complex convex curved air flow/ boundry layer pattern without the complexity

Quote:
Gurney flap

The Gurney flap (or wickerbill) is a small tab projecting from the trailing edge of a wing. Typically it is set at a right angle to the pressure-side surface of the airfoil[1] and projects 1% to 2% of the wing chord.[2] This trailing edge device can improve the performance of a simple airfoil to nearly the same level as a complex high-performance design.[3]


A Gurney flap shown on the underside of a Newman airfoil (from NASA Technical Memorandum 4071).
The device operates by increasing pressure on the pressure side, decreasing pressure on the suction side, and helping the boundary layer flow stay attached all the way to the trailing edge on the suction side of the airfoil.[4] Common applications occur in auto racing, helicopter horizontal stabilizers, and aircraft where high lift is essential, such as banner-towing airplanes.[5]

It is named for its inventor and developer, American race car driver Dan Gurney.[6][7]
Wing fence =
Quote:
Wing fences, also known as boundary layer fences and potential fences are fixed aerodynamic devices attached to aircraft wings. Often seen on swept-wing aircraft, wing fences are flat plates fixed to the upper surfaces parallel to the wing chord and in line with the free stream airflow, typically wrapping around the leading edge
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Old 01-31-2021, 06:55 PM   #25 (permalink)
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Wickerbill = trim tab on full lock.

Dan Gurney also invented the Gurney Bubble.


www.thetruthaboutcars.com/2014/11/gurney-bubble-gurneys-bubbly/

Quote:
When they were developing the prototype and Gurney tried the cockpit on for size, he had to tilt his head just to fit, so the fabricators at Kar Kraft, Ford’s protofab shop in Dearborn, gave that chassis’ roof a bump. The Gurney bubble (not to be confused with a Zagato bubble) is actually pretty complex, going together from contours on the roof panel, the door, and the engine cowl. You may notice that the steering wheel is on the right hand side of the car, which explains why the bubble is on that side of the roof. Though the Mk IV has right hand drive, it was indeed made in the USA.
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It's interesting, in light of recent controversy, That this comment highlights that the squareback 'bread-van' body killed Ken Miles. The solution was a fastback.
Quote:
jhefner
November 15th, 2014 at 2:04 pm
Great article Ronnie; good to see the MkIV and Dan Gurney reunited. Learned more details about the history of the Ford GT program and the “Gurney Bubble.”

Missing from your timeline is the unfortunate J-car. It was originally built in a “bread van” shape based on the wind tunnel data. During a test session at Riverside International Raceway in August 1966, with Ken Miles driving, the car flipped on it’s back. The honeycomb chassis did not live up to its design goal, shattering upon impact, bursting into flames and killing Miles.

It was determined that the bread van shape generated too much lift; the same issue that caused the Mercedes CLR to flip on it’s back; the crash ended Mercedes’ involvment in sports car racing. Ford instead redesigned the J-Car into the Mk-IV.

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