The RQ-4 Global Hawk is an unmanned aerial vehicle (UAV) used for surveillance by the United States Air Force and Navy. It can survey up to 40,000 square miles of terrain per day from high altitudes. The aircraft was first flown in 1998 and has undergone several variants for different missions. The Global Hawk uses a single turbofan engine and has a wingspan of over 130 feet, allowing it to reach high altitudes and fly missions up to 28 hours in length with a range of over 8,700 miles.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
Strowger Switching System is the first automatic telephone exchange .The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics it is also known as a step-by-step (SXS) switch.
Why do Transformers Fail?
�The electrical windings and the magnetic core in a transformer are subject to a number of different forces during operation, for example:
�Expansion and contraction due to thermal cycling
�Vibration
�Local heating due to magnetic flux
�Impact forces due to through-fault current
�Excessive heating due to overloading or inadequate cooling
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
Strowger Switching System is the first automatic telephone exchange .The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics it is also known as a step-by-step (SXS) switch.
Why do Transformers Fail?
�The electrical windings and the magnetic core in a transformer are subject to a number of different forces during operation, for example:
�Expansion and contraction due to thermal cycling
�Vibration
�Local heating due to magnetic flux
�Impact forces due to through-fault current
�Excessive heating due to overloading or inadequate cooling
Theoretical Presentation of QUAD COPTER where all the historical backgrounds ( Early Attempt and Recent Development), Flight Control and its uses are described. It is helpful for the beginners and also those who want to make a theoretical presentation about it. This was one the best Presentation in our college (+2 level)
World Speed Record 30th Anniversary 1986-2016Leonardo
On the evening of 11 August 1986, a Westland Lynx flew a 15 kilometre course across the Somerset Levels, achieving an average speed of 400.87km/h (249.10 mph).
It became the world’s fastest helicopter. In 2016, thirty years on, this helicopter World Speed Record remains unbroken.
Read the story of this amazing achievement and the people involved in the project.
3. Introduction
• The Northrop Grumman RQ-4 Global Hawk is
an unmanned aerial vehicle (UAV) surveillance aircraft.
• It can survey as much as 40,000 square miles
(100,000 km2) of terrain a day.
• The Global Hawk is operated by the United States Air
Force and U.S. Navy.
• It is used as a high-altitude platform for surveillance
and security.
• The U.S. Navy has developed the Global Hawk into
the MQ-4C Triton version for maritime surveillance.
4.
5. Development
• The Global Hawk took its first flight on 28 February 1998.
• The first seven aircraft were built under the Advanced
Concept Technology Demonstration (ACTD) program,
sponsored by DARPA.
• Nine production Block 10 aircraft, sometimes referred to as
RQ-4A, were produced; of these, two were sold to the US
Navy and an additional two were deployed to Iraq to support
operations there.
• First flight of the Block 20 from the USAF Plant 42 in Palmdale,
California to Edwards Air Force Base took place on 1 March
2007.
• Developmental testing of Block 20 took place in 2008.
6.
7. EuroHawk
• The German Air Force (Luftwaffe) ordered a variant of the
RQ-4B, to be equipped with a customized sensor suit
designated EuroHawk.
• The aircraft was based on the RQ-4B Block 20/30/40 and
was to be equipped with an EADS-built SIGINT package.
• The EuroHawk was officially rolled out on 8 October 2009
and its first flight took place on 29 June 2010.
• On 8 August 2013, the EuroHawk set an endurance record
by flying continuously in European airspace for 25.3 hours,
reaching an altitude of 58,600 feet (17,900 m).
• It was the longest flight by an unrefueled UAS weighing
more than 30,000 lb (14,000 kg) in European skies.
8.
9. Design
• The Global Hawk UAV system comprises the RQ-4 air vehicle, which is
outfitted with various equipment such as sensor packages and
communication systems.
• A ground element consisting of a Launch and Recovery Element (LRE),
and a Mission Control Element (MCE) with ground communications
equipment.
• Each RQ-4 air vehicle is powered by an Allison Rolls-
Royce AE3007H turbofan engine with 7,050 lbf (31.4 kN) thrust, and
carries a payload of 2,000 pounds (910 kilograms).
• The fuselage comprises an aluminum, semi-monocoque construction;
the wings are made of lightweight high-strength composite materials.
