Zazzle Shop

Screen printing
Showing posts with label Sound Barrier. Show all posts
Showing posts with label Sound Barrier. Show all posts

Friday, October 22, 2010

Planes Breaking The Sound Barrier

Published by Nat B
From http://www.djmick.co.uk/

Planes Breaking The Sound Barrier

These are pictures that we rarely if ever see simply due to the fact the timing has to be precise.  When a plane hits the sound barrier it refers to the point at which an aircraft moves from transonic to supersonic speed.
The term came into use during World War II when a number of aircraft started to encounter the effects of compressibility, a collection of several unrelated aerodynamic effects. By the 1950s, new aircraft designs started to routinely “break” the sound barrier

But for simple people like us if refers to a badass point in time where a plane looks like it’s going through some kind of storm that it created on its own. And that storm happens to look pretty awesome.

Planes Breaking The Sound Barrier

Planes Breaking The Sound Barrier

Planes Breaking The Sound Barrier

Planes Breaking The Sound Barrier

Planes Breaking The Sound Barrier

Planes Breaking The Sound Barrier

Planes Breaking The Sound Barrier
source


Prandtl–Glauert singularity

More info here: http://en.wikipedia.org/

Wednesday, June 16, 2010

Host broadcasters to 'filter' noise from vuvuzelaV

Associated Press
From: http://soccernet.espn.go.com/

JOHANNESBURG -- TV viewers can take out their earplugs -- the vuvuzelas are going to have a bit less buzz.

Host Broadcast Services, the company that provides the broadcast feed for the World Cup, said Tuesday it has doubled its audio filters to reduce the constant blaring buzz of vuvuzelas.

TV viewers around the globe have complained that the swarm-of-bees sound from the plastic horns is stinging their ears.

"Despite HBS' core philosophy, which is to provide 'realistic' host broadcast coverage reflecting the ambience in the stadiums, additional audio filtering has been implemented," according to the daily newsletter given to rightsholders Tuesday.

The filters also will minimize other crowd noise in the stadiums, such as chants and cheers.

Several broadcasters already had taken their own measures to reduce the drone. French broadcaster TF1 changed its microphones after the opening match between Mexico and host South Africa, replacing them with mics commentators hold close to their mouths to better filter sound.

The BBC, which had received 545 complaints from viewers as of Tuesday morning, said it is considering giving viewers the option of muting ambient noise while maintaining game commentary through its "red button" digital service. Viewers would push a red button on their remote controls to receive the quieter broadcast on a separate channel.

"We have already taken steps to minimize the noise and are continuing to monitor the situation," the BBC said in a statement. "If the vuvuzela continues to impact on audience enjoyment, we will look at what other options we can take to reduce the volume further."

The noise of the vuvuzelas has been the talk of the World Cup, so much so that British bookmaker William Hill is now taking bets on whether the horns will be banned at English Premier League stadiums next season.

"The vuvuzela certainly polarizes opinion, and we suspect that individual clubs will want to put a rule in place to enable them to ban them should they threaten to become widespread," Hill's spokesman Graham Sharpe said.

Hill's also is taking bets that the vuvuzelas will be banned by the end of the World Cup. But FIFA president Sepp Blatter has strongly backed the use of the horns since they were introduced to the wider football world at the Confederations Cup test event in South Africa exactly a year ago, and he said again Monday they're here to stay.

The vuvuzelas are something uniquely African, and Blatter said he is not about to ban the music traditions of fans in their own country.

Several players said the din of the horns is having an impact on the field. Netherlands striker Robin van Persie avoided a second yellow card -- and a ban from the next game -- by blaming the vuvuzelas for failing to hear an offsides whistle.

Argentina striker Carlos Tevez said the din of vuvuzelas makes it hard for players to communicate with each other on the field.

"Those sirens or trumpets -- I don't know what they are -- make it very difficult to speak on the field," Tevez said after Argentina's training session Tuesday at the University of Pretoria. "You have to shout and sometimes you run out of breath, you get a bit more tired. They are extremely bothersome."

But van Persie said he doesn't want to see vuvuzelas banned.

"I think we have to respect it, because we are in South Africa, and we need to respect where we are," he said. "This is their tradition. This belongs to them."

In Durban, Switzerland coach Ottmar Hitzfeld scheduled an extra public training session and invited South African fans, knowing they would bring their plastic horns.

Hitzfeld said it was good practice for his players to get used to communicating on the pitch when their voices are drowned out by the constant buzz.


Copyright 2010 by The Associated Press

Tuesday, June 15, 2010

BBC May Filter Out Vuvuzelas from Broadcasts

Fans play their vuvuzelas prior to the World Cup group D soccer  match between Serbia and Ghana at the Loftus Versfeld Stadium in  Pretoria, 13 June 2010
Photo: AP

Fans play their vuvuzelas prior to the World Cup group D soccer match between Serbia and Ghana at the Loftus Versfeld Stadium in Pretoria, 13 June 2010

The BBC says it may start to filter out the sound of vuvuzelas from its World Cup broadcasts, following complaints about the incessant drone.

The BBC said Tuesday it had received 545 complaints from viewers, forcing officials to look into options to reduce the noise from the plastic trumpets.

One option would be to offer an electronic filter that reduces most of the ambient noise while maintaining the game commentary.

Football coaches, players and reporters have all complained about the constant din generated by thousands of vuvuzelas at the stadiums. However, FIFA officials say the horns are a South African tradition and will not be banned.

Some information for this report provided by AP, Reuters and AFP.

Thursday, May 14, 2009

Stealth bomber photographed breaking sound barrier

A stealth bomber is frozen in time as it breaks the sound barrier during a test flight above the Californian desert.
A Stealth bomber is frozen in time as it breaks the sound barrier during a test flight above the Californian desert : Stealth bomber photographed breaking sound barrier
B-2 Spirit Bomber breaking the sound barrier over Palmdale, California Photo: EPA

Its unmistakable teardrop profile is shrouded in the blur of a condensation cloud as it reaches high subsonic speed.

The striking image of the B-2, officially known as the Spirit Bomber, was taken as the aircraft soared over Palmdale, near Los Angeles.

It was released to coincide with the announcement of upgraded military software for the United States Air Force's fleet of 20 B-2s.

The bomber is central to America's air warfare capabilities and is the flagship of the nation's long-range strike arsenal, with the ability to unleash conventional and nuclear weapons.

Its stealth comes from a combination of reduced acoustic, infrared, visual and radar signatures, making it difficult for opposition defences to detect, track and engage the aircraft.

They have seen action in Iraq and Afghanistan.

The B-2 can travel as high as 50,000ft and weighs 153,700lbs without its payload of bombs.

The cloud effect is caused by a vapour cone also known as the "Prandtl-Glauert singularity".

It appears when there is a sudden drop in air pressure around aircraft travelling just above or below the speed of sound.

These condensation clouds, also known as "shock collars", are frequently seen during space shuttle launches but their precise nature is still under debate.

US defence contractor Northrop Grumman Corporation disclosed on Tuesday that it is installing upgraded software in the B-2 bombers' flight management system.

A statement from technology group Semantic Designs, which designed the software, said the project "will enhance and extend the lifetime of the B-2".

The company said: "Although the B-2 is the Air Force's newest bomber, its computers and processors require upgrade to keep up with integration efforts.

"Expanded and more reliable systems are necessary to maintain the B-2's leading edge combat capabilities."