RC Hobby-Cell Phone-shoes Blog

Coaxial rc helicopter is one of the more popular  that come to our mind when people think about electric RC helicopters. And for good reasons too; these double-bladed helicopters is accredited with bringing hordes of new enthusiast into the world of RC aviation. Their popularity stems from their unequivocal stability in the air – which makes them relatively easier to master when compared to their single rotor counter part. They are also predictable enough to be flown within the compounds of one’s home, securing its spot as one of the most loved indoor fliers. Being able to fly right out of the box because they are sold as RTF (Ready to Fly) kits adds to their appeal.

So where did such stability come from? To answer that, the first step lies in understanding how helicopters work. A single-rotor helicopter generates lift when their rotor rotates. As the main rotor turns, another force will also be generated – known as torque, which will in turn cause the entire fuselage to turn in the opposite direction. Since the days when helicopters were in their nascent stage, their pioneers have learnt to counter this effect by including another smaller perpendicular rotor in the tail. This rotor counters the any rotation generated by the torque as well as provides pilots a mean to control the direction in which the helicopter’s nose is pointing at, more technically known as the yaw. To control the yaw, the pilot simply changes the pitch (or the angle) of the tail rotor.

Coaxial helicopters, on the other hand, eliminate the need of a tail rotor completely. This is due to the fact that these fliers have two rotors, one on top of the other, rotating in opposite directions. In effect, the torque generated by each rotor cancels out one another. When such feat is coupled with two rotors’ lift complementing each other results in the extraordinary stability and hovering ability. Because hovering is one of the main components of a helicopter’s flight, "easier to hover" is almost synonymous to "easier to fly". Controlling the yaw in this setup becomes only a matter of slowing or speeding up one of the two rotors. Another merit that comes almost as a bonus is that theoretically, these helicopters do not require a gyro – which means that much less tinkering and setting up is needed.
Although very widely praised, coaxial helicopters are not without faults. The first one stems from the fact that in order to fly, the speed of the two rotor blades must be equal. In fact, these helicopters are so dependent on the synchronicity of its blades that even the slightest deviation is detrimental. So much so that these helicopters will just spin wildly on the ground, never to lift off. Their two motors simply have to always be in their most pristine state. Also, the stability of these helicopters comes at the price of sacrificed maneuverability; they are notoriously slow and unresponsive. Nevertheless, perhaps the utmost annoyance comes when the two blades bite into each other in mid air when most extreme cyclic controls are applied.
All in all, coaxial helicopters are here to stay. They have become the favorite beginners’   rc helicopters. At the same time, many experienced pilot enjoy a flight or two of easy indoor flying with these helicopters once in a while.

Note: Although these coaxial helicopters are "relatively" easier to fly than their conventional counterparts, they still require hours of practice. Also, their fast rotating blade can cause just as much injury as bigger model helicopters. Therefore, never treat them like toys.

U.S. UH-1C helicopter’s basic configuration

Single rotor with tail rotor (Ducted Fan)
The most common rc helicopters type rotors provide a lift, a small vertical tail rotor (tail rotor) is responsible for offsetting the anti-torque rotor. Some models will be designed for ducted tail rotor type, such as the Eurocopter EC-135 helicopters made.
No single-rotor tail rotor (NOTAR)
provide a level of rotor lift, the rear side of the fuselage with the air, and the rotor downwash flow interaction of lateral force to offset the anti-torque rotor. For example, the U.S. helicopter McDonnell Douglas Helicopter MD520N production.

Sikorsky S-92

Eurocopter EC-135

  MD MD520N

Fixed-wing RC airplanes flight lift the body from the fixed wing airplane. When the fixed-wing airplane fly forward, the wing and the relative motion between the air and then generate lift. Lift rc helicopters and wing produced similar principle, only the lift is fixed around the axis from the " rotor . " Do not rely on rotary-wing aircraft flying throughout the body forward to make the wings and the air produces relative motion, but on its own rotation and the relative movement of air. However, while the rotor to provide lift, the helicopter fuselage will be for anti-torque (with the drive rotor rotation equal but opposite torque, that reaction torque) the role of the rotation with trends in the opposite direction. For the single-rotor helicopter, in order to balance the anti-torque, a common practice is another small rotor, tail rotor that is in the rear fuselage offset by the reverse movement of the torque produced. For multi-rotor helicopters, multi-use between the counter-rotating rotor ways to offset the anti-torque effect.

With the continuous development of various mobile phone operating system for high-end mobile phone player, the simple application, ROM can not satisfy their curiosity, change into their pursuit of mobile phone operating system. But there are a considerable number of players on one hand, not satisfied with the current operating system, but also strong on the Android system such upstart of curiosity, like the Deep and to start with. For this consumer psychology, many china cell phones  manufacturers have begun to develop smart phones equipped with dual system, and strive for greater customer base.

New to science and technology trends are often open from the cottage, as this appearance seem G2, address him by his phone for the GPhone smart phones, equipped with a WM6.5 and google  Android phone OS , but need to bring their own CD in random Brush copyed memory card software, was able to complete the switch operating systems, it is inconvenient to the general audience.

Cottage GPhone use Marvell PXA310 624MHz processor, 3.2-inch resistive touch screen, resolution 480 * 320 (HVGA), RAM128MB + Flash256MB, 8GB extend maximum support. WM6.5 + Android 1.5 support the dual system, optional software more.

This GPHONE price of more than 1200 yuan, the hardware configuration is relatively quite satisfactory, it should be none other space.

GPS, WIFI function has become a basic configuration of the current intelligent machines, then the dual system china mobile phones,of the machine appears to be too specific smart phone will add new highlights. With the dual system or system operation, in the days, the mobile phone brand is no longer the limit, application development is the direction we need to think about first.

Language for day X90 Dual SIM dual standby propaganda with the facts, we phone interview in China China’s first home dual card dual standby phone technology Yulong Cool Communication Technology Co., Ltd. Yong Gu, director of brand marketing. The ancient Chinese general told reporters when talking about mobile phones, currently on the market claiming dual card dual standby mobile phone technology sources are from 2004, China Unicom launched dual-mode single-pending product, launched in 2005, dual-mode dual standby Cool Products to achieve a double number in a cell phone while dual network standby. Later, Cool in the G-line also achieved double-number at the same time standby and connected, this is the dual card dual standby technology was the origin.

Our reporters have been talking about mobile phones in China, currently on the market have a lot of cottage also claim to be a dual sim phone dual standby in the technology and use it as capital of wild speculations, than the price of a single card single number by nearly 50% more expensive .

On this issue the ancient general, said the real dual sim dual standby requirement is a number in the call, another number will prompt a call came in from the user decide whether to answer. In some cottage products and technologies because of cost constraints, can do dual card standby at the same time, can not simultaneously call, not the actual meaning of dual card dual standby. Test whether a cell phone is a true dual card dual standby is also very simple, with a phone call to another phone call came in a busy tone or be able to connect will be able to distinguish the.

There are a lot of friends in the use of cottage dual sim apple iphone phone, there are a considerable number of people were called "kerosene." But the news that Apple has to get iPhone / iPod Touch’s design patent. Apple did not get in before the design patent, there is a lot of "class iPhone" mobile phone products, but also the most well-known from non-manufacturers, but Apple was not yet received design patent, but this does not mean that Apple does not care .

Today, Apple obtained a first-generation design (including the iPod Touch) the patent is likely the next time some "class iPhone" mobile phone makers to attack. Known as " China dual sim apple iPhone " Apple  phoneis likely to become the first target, of course, these are mere speculation.

And, like Google Android phone OS, jointly launched by Intel and Nokia’s MeeGo cell phone operating system is Linux technology popular platform for mobile terminals. Currently the system has been delivered to the Linux Foundation to promote, Linux Foundation director of operations in China Ke Li Fu said to ZDNet, the Foundation will be fully mobile equipment manufacturers to promote MeeGo system, but also very much welcome the Shenzhen small and medium sized companies use the platform cottage.

MeeGo is the combination of Nokia’s Maemo platform and Intel’s Moblin Linux operating system, Intel concluded in April on the Beijing IDF, it was the industry’s attention. Ke Li Fu said, the first version of the MeeGo system will be released next month, Nokia will launch a mobile phone equipped with MeeGo, while Intel will launch the appropriate hardware.In fact, MeeGo be delivered by the Linux Foundation, a non-profit organization management actually accelerated the pace of the promotion system itself. Ke Li Fu said that as the nature of the Foundation, currently supports MeeGo system manufacturers have many competitors, vendors are currently supported Neusoft, Acer, Intel, Tencent, EA, DeviceVM and other kinds of companies.

In addition to large companies, including companies like cottage  apple iphone dual sim  manufacturers have also been welcomed into the MeeGo lineup. Ke Li Fu said, and as Android, this system is more suitable for smart phones, netbooks, automotive systems, networks, television and other kinds of products, and after delivery in Intel, MeeGo also supports the ARM and other architectures, not just Intel The X86 architecture.However, Linux Foundation and will not choose to operate a unified online application store. Android, iPhone OS, including the main product is touted has mature online App Store. Ke Li Fu said that the nature of the Foundation, will establish uniform procedures for shops, while he supported the various vendors set up under this system, different application platforms.

On the other hand, Linux Foundation has just announced the first region to set up branches in China, in fact, Ke Li Fu Foundation, I was the first person in China. However, he employed many years in the Linux industry, has created such famous enterprises Turbo. He said, "I will start and Chinese enterprises to communicate, in promoting the Foundation, while also MeeGo to promote."

Highlights

• Touch Screen – Easy-to-use and responsive touch screen function for smooth navigating, watch mobile phone.
• Dual SIM  phone-  Dual working(Dual standby).
• Fully Unlocked – Works on all four main GSM frequency bands for great reception world wide.
• FM Radio – Pick up your favorite FM radio stations wherever you are.
• Bluetooth – High speed wireless technology.

Additional Feaures:

• Dual cards standby phone  
• MP3 / MP4 player 
• Calendar 
• Memo 
• World time  
• Calculator
• Support memory card  
• Support GPRS  
• Sound recorder
• Touch Screen
• E-book reader  
• FM 
• MMS 
• WAP

Unlike the U.S. market, with Google Android  phone operating system products and not its peak performance. Survey data show that the most popular on the market several phones on the market in April being "cold."

Market performance in the hottest HTC Hero frustrated once in mid-April, although the rebound, but in the end follow-up fatigue, it is difficult to achieve a breakthrough, finally maintained at the original share; the top three of the other 2 products, the overall follow the footsteps of the market, market performance have different degrees of decline.

Summary: China mobile phone market, Google Android operating system is not in the U.S. market, so shine, market performance can be "mediocre" to describe a whole even is temporarily down signs. • Eric Schmidt said "china Android phone is expected to play in the global handset market first or second role" in the Chinese market will not be staged!

A mobile phone that contains two numbers of subscriber identity modules or sim cards is known as a dual sim phone. The introduction of the sophisticated technology has rewarded the consumer by relieving him from the discomfort of carrying two sets of  china cell phones. People have welcomed this unique device for being able to use one sim for official purpose and the other for just personal use. The operation is very simple, which can be effected by the operation in the phone menu itself.

The popularity of the dual Sim iphone touched a tremendous growth due the versatility of its function. A number of working people are using this special device to get the benefit of being connected to the office and the personal world at the same time through a single mobile phone. This wonderful accessory was introduced in the market only during the later half of the previous year.

There is another aspect, which has triggered immense popularity among the mass is its advantage of the coverage. This means that when a particular sim card is not working, you can still be in touch with your family or office with the help of the second sim card. So you are always in touch with your near and dear ones. All the facilities come in an affordable price range, which is yet another benefit for common people.

This kind of dual sim phone is being highly appreciated by the business class people. They make full use of the facilities provided by the dual sim mobile phone. One particular sim card is from the origin country, which they belong to and the other one for the place where the business man has gone for his business purpose. So he is able to make his business trip successful without having two sets of mobile phones with him causing unnecessary discomfort.

Earlier there was a facility to insert two sim cards into a single phone but only one of the sim cards could be activated at a time. They had to switch off the phone and switch on again to use the next sim card. Later software was developed to solve this problem which helped users to switch between the cards without switching the phone off and on. But this had its own flaw. Only one line could be used at a time. You could receive calls one at a time.

People did use dual sim cards before the advent of these new dual sim phones. In the earlier case, there were phones available to support two sim cards, but the major flaw was that you had to switch off your instrument to access the second sim. Later with more technological developments advance software was introduced to counter this hitch and it became possible to switch between the cards without shutting off the instrument. Now this facility had its flaws. Calls from one line only could be received at a time.

Our technology has further advanced to provide us with models capable of enabling continuous usage of dual cards. A combination of CDMA and GSM technologies are used to transmit voice data. These types of phones are readily available in the market. All information regarding the service providers providing this facility is available on the net.