The delta wing is a wing shaped in the form of a triangle. It is named for its similarity in shape to the Greek uppercase letter delta. Although long studied, it did not find significant applications until the jet age, when it proved suitable for high-speed subsonic and supersonic flight. At the other end of the speed scale, the Rogallo flexible wing proved a practical design for the hang glider and other ultralight aircraft; the delta wing form has structural advantages. Many design variations have evolved over the years and without additional stabilising surfaces; the long root chord of the delta wing, minimal structure outboard, make it structurally efficient. It can be built stronger, stiffer and at the same time lighter than a swept wing of equivalent lifting capability; because of this it is easy and inexpensive to build – a substantial factor in the success of the MiG-21 and Mirage aircraft. Its long root chord allows a deeper structure for a given aerofoil section, providing more internal volume for fuel and other storage without a significant increase in drag.
However, on supersonic designs the opportunity is taken to use a thinner aerofoil instead, in order to reduce drag. Pure delta wings exhibit flow separation at high angles of attack and high drag at low speeds. At low speeds a delta wing requires a high angle of attack to maintain lift. A slender delta creates a characteristic vortex pattern over the upper surface; some types with intermediate sweep have been given retractable "moustaches" or fixed leading-edge root extensions to encourage vortex formation. As the angle of attack increases, the leading edge of the wing generates a vortex which energises the flow on the upper surface of the wing, delaying flow separation, giving the delta a high stall angle. A normal wing built for high speed use has undesirable characteristics at low speeds, but in this regime the delta changes over to a mode of lift based on the vortex it generates, a mode where it has smooth and stable flight characteristics; the vortex lift comes at the cost of increased drag, so more powerful engines are needed to maintain low speed or high angle-of-attack flight.
With a large enough angle of rearward sweep, in the transonic to low supersonic speed range the wing's leading edge remains behind the shock wave boundary or shock cone created by the leading edge root. This allows air below the leading edge to flow out, up and around it back inwards creating a sideways flow pattern; the lift distribution and other aerodynamic characteristics are influenced by this sideways flow. The rearward sweep angle lowers the airspeed normal to the leading edge of the wing, thereby allowing the aircraft to fly at high subsonic, transonic, or supersonic speed, while the subsonic lifting characteristics of the airflow over the wing are maintained. Within this flight regime, drooping the leading edge within the shock cone increases lift but not drag; such conical leading edge droop was introduced on the production Convair F-102A Delta Dagger at the same time that the prototype design was reworked to include area-ruling. It appeared on Convair's next two deltas, the F-106 Delta Dart and B-58 Hustler.
At high supersonic speeds the shock cone from the leading edge root angles further back to lie along the wing surface behind the leading edge. It is no longer possible for the sideways flow to occur and the aerodynamic characteristics change considerably, it is in this flight regime that the waverider technique, as used on the North American XB-70 Valkyrie, becomes practicable. Here, a shock body beneath the wing creates an attached shockwave and the high pressure associated with the wave provides significant lift without increasing drag. Variants of the delta wing plan offer improvements to the basic configuration. Canard delta – Many modern fighter aircraft, such as the JAS 39 Gripen, the Eurofighter Typhoon and the Dassault Rafale use a combination of canard foreplanes and a delta wing. Tailed delta -- adds a conventional tailplane. Common on Soviet types such as the Mikoyan-Gurevich MiG-21. Cropped delta – tip is cut off; this helps reduce wingtip flow separation at high angles of attack. Most deltas are cropped to at least some degree.
In the compound delta, double delta or cranked arrow, the leading edge is not straight. The inboard section has increased sweepback, creating a controlled high-lift vortex without the need for a foreplane. Examples include the Saab Draken fighter, the prototype General Dynamics F-16XL and the High Speed Civil Transport study; the ogee delta used on the Anglo-French Concorde Mach 2 airliner is similar, but with the two sections and cropped wingtip merged into a smooth ogee curve. Like other tailless aircraft, the tailless delta wing is not suited to high wing loadings and requires a large wing area for a given aircraft weight; the most efficient aerofoils are unstable in pitch and the tailless type must use a less efficient design and therefore a bigger wing. Techniques used include: Using a less efficient aerofoil, inherently stable, such as a symmetrical form with zero camber, or reflex camber near the trailing edge, Using the rear part of the wing as a lightly- or negatively-loaded horizontal stabiliser: Twisting the outer leading edge down to reduce the incidence of the wing tip, behind the main centre of lift.
This improves stall characteristics and can benefit supersonic cruise in other ways. Moving the centre of mass forwards and trimming the elevator to exert a balancing downforce. In the extreme, this reduces the craft's ability to pitch its nose up for landing. A conve
Eric Harding is an American former professional boxer who fought at light heavyweight. Harding was undefeated in his first 20 fights; these wins included a fight in which he defeated future champion Montell Griffin by split decision to win the NABF light heavyweight title on Nov 13, 1998, a unanimous decision over undefeated contender Antonio Tarver on June 23, 2000. His streak came to an end when he fought Roy Jones, Jr. for the WBC, WBA, & IBF light heavyweight titles on Sept. 9, 2000. He lost by technical knockout, but after the fight Jones Jr. said it was his most difficult fight to date. On Feb. 11, 2005 he defeated David Telesco to claim the vacant USBA light heavyweight title, but lost the title the following year to Chad Dawson by decision, despite dropping Dawson in the 1st round. Professional boxing record for Eric Harding from BoxRec
The men's 100 metre breaststroke competition of the swimming events at the 2011 Pan American Games took place on October 16 at the Scotiabank Aquatics Center in Mexico. The defending Pan American Games champion was Scott Dickens of Canada; this race consisted of two lengths of the pool. Prior to this competition, the existing world and Pan American Games records were as follows: Each National Olympic Committee was able to enter up to two entrants providing they had met the A standard in the qualifying period. NOCs were permitted to enter one athlete providing they had met the B standard in the same qualifying period. All times are in seconds; the first round was held on October 16. The B final was held on October 16; the A final was held on October 16
Lisa "Duffy" Duffin is a fictional character from the BBC medical drama Casualty, played by Cathy Shipton. Duffy was created by Paul Unwin as one of the serial's ten original characters. Shipton received her audition, she thought her chances of being cast were slim, as she had on bandages following a fall, producer Geraint Morris was fascinated by the incident and asked her about her time in the hospital. Shipton was considered for the role of receptionist Susie Mercier, before being cast as Duffy, she made her debut in the pilot episode of the first series, broadcast on 6 September 1986. Duffy is characterised as a "tough" and "carefree" nurse, she wears neatly ironed uniforms. Shipton has stated; the character has been used to portray various issue led stories. First, she became the victim of sexual assault, which caused her to lose her "happy go lucky" persona. Shipton recalled that it was her most harrowing story. Next, she had an HIV scare following the break down of her relationship with Peter Tranter.
In her years on the show, Duffy battled depression and anxiety, in 2018, producers created a story arc in which she is diagnosed with vascular dementia. Her stories have been focused on her many relationship woes via her three marriages; the first with Registrar Andrew Bower, the second with Ryan Johnson, a hospital security guard. Writers created her third marriage with Charlie Fairhead, following a "will they?, wont they?" Relationship that spanned thirty years. Shipton rejoined the cast of Casualty numerous times; the actress first chose to leave the serial in 1993 and Duffy left Holby to start a family with Andrew. She remained until 2002 when she departed with Ryan, she returned in 2006 for two special episodes set in Cambodia. Shipton reprised the role in 2015 for the show's thirtieth anniversary and was soon tempted back on a permanent basis; the actress announced her departure from the series in October 2019, Duffy made her final appearance on 1 February 2020. The character has been well received by television critics, with a reporter from The Daily Telegraph listing Duffy as one of the top ten best Casualty characters.
Shipton received a nomination for Best Drama Star at the 2017 Inside Soap Awards. Duffy is one of ten original characters conceived by the creators of Casualty Jeremy Brock and Paul Unwin. Cathy Shipton was working as an aerobics instructor and thinking of giving up her acting career when she received an audition for the show; the audition for the role was held on 11 January 1986. Not wanting to appear in her instructor's outfit, she borrowed some clothes and ran across London to get to the audition on time. Shipton fell over, she went to an accident and emergency department where they treated her for a sprained ankle and placed bandages on her. The actress was convinced, but Casaulty producer Geraint Morris was fascinated by the incident and quizzed Shipton about her time at the hospital. She acted out part of the procedure; this intrigued his team of writers who decided to hire her. She was surprised when she received the part of Duffy and it only sank in when she was being fitted for her costume.
Shipton admitted that she was nervous during her first day on set and did not think her Bristol accent sounded right, likening it to "a demented Pam Ayres". She was asked to tone down her accent, so it was easier for viewers to understand what she was saying. Shipton was considered for the role of Susie Mercier, a character who filled the role of the emergency department's receptionist; when Duffy was introduced into Casualty she was played as a "carefree" character with a "tough" and "determined" side. Writers gave her hobbies including dieting and gossiping. Duffy has a distinct appearance and style - her hair is pinned up and she wears a neatly crisp ironed uniform. Shipton carries her with a serious facial expression that "inspires confidence"; the actress has stated that Duffy is a "real" middle-aged and "hard-working" mother who female viewers could relate to. Duffy does not always make the right life viewers responded well to this. Shipton wanted Duffy to appear as authentic as possible.
She always did her own suturing in scenes and this made her feel like a nurse, which added to the realism on-screen. In the first series the character was shown not taking her job seriously, she would gossip with Susie about her colleagues personal lives. She filled her time trying out diets, she protested against a local cinema showing adult films about nurses and succeeded at having them removed. But Duffy's behaviour was soon changed. Shipton felt, she described Duffy in her early episodes as "a kidney bowl carrier, a blue flash, little more." Following being sexually assaulted Duffy dropped her "cheeky girl" mentality and gained an "emotional life". Pregnancy made the character more determined and career driven. Shipton explained that Duffy "became a sister, there was another gear change. I think lots of women who bringing up a child identified with her. I had the chance to show that Nurses are professionals, not dogsbodies or angels or girls desperate to find a doctor to marry them."By 2006, Shipton viewed Duffy differently because of her l
Pembine High School is a high school in the Town of Pembine, Wisconsin. The school is named Beecher-Dunbar-Pembine High School after the district to which it belongs. Opened in 1903, the high school served the Pembine District, but added other geographic areas; the school serves K-12 students, with a student population of 257. The first high school in Pembine was a four-room schoolhouse built in 1903 that served different grades. In 1957 additions of a cafeteria and shop enlarged and modernized the school. Further additions came in 1973 with a library. In 1990, when the school faced overcrowding problems, it considered consolidating with Niagara High School; the decision to consolidate was turned down by a town vote. In 1997 to answer the overcrowding problem the town passed a $2 million addition to Pembine High School that nearly doubled the square footage. Pembine High School requires at least 25 credits in core courses to graduate. Departments include: Art Career and Technical Education English Math Music Science Social StudiesOn December 23rd 2013, seven teachers at Pembine High School were among 77 statewide to earn National Board Certification.
This made Pembine the school with the highest concentration of Nationally Board Certified Educators in the state. Extracurricular activities include: Art Club Band Handbells Math Club Drama Club School Yearbook Student Council Forensics French Club National Honor Society Students Against Dangerous Decisions Pembine High School has three mascots for its athletic teams. For football, Pembine tri-ops with Niagara Public School and Goodman-Armstrong Creek High School to make up the Northern Elite Predators. Girls' high school basketball, girls' high school softball, boys' high school baseball, girls' cross country and boys' cross country are consolidated with Goodman-Armstrong Creek High School to make up the Pembine-Goodman Patriots; the mascot of Pembine High School for girls' high school volleyball, boys' high school basketball, golf is the Panther. Boys' basketball Girls' basketball Football Girls' softball Boys' baseball Boys' & girls' golf Girls' volleyball Cross country Official website
Elaea or Elaia Elea, was a town of Thesprotia in ancient Epirus toward the mouth of the Acheron river. The town is mentioned by Ptolemy. Thucydides calls the surrounding district Elaeatis and indicates that Ephyra was in the territory of Elaea, its port was Elaias Limen the "Bay of Elaea", which the Periplus of Pseudo-Scylax asserts was the main port of Thesprotia. Coins ascribed to the town, with the inscription "ΕΛΕΑΤΑΝ" or "ΕΛΕΑΙ", have been found that have been dated c. 360-335 BCE. The town's site is identified as near Khrysavgi. Smith, William. "Acheron". Dictionary of Greek and Roman Geography. London: John Murray