- Category: Engineering
- Hits: 71
Tupolev Tu-144 was world's first supersonic airplane, which took off first in 1996, even before Concorde. Find here interesting facts about Tupolev Tu-144 that you would have never heard before
1. Tupolev Tu-144 could fly with maximum speed of 1510 mph (2430 kmh). This is slightly more speed than Concorde.
2. Like Concorde, the Tupolev Tu-144 was also prohibited from flying over certain areas, due to the noise it created.
3. Due to political and economic crisis that were developed in USSR in 1980's the government started saving money and the program to create further Tupolev Tu-144 was also effected.
4. After flying 55 times, in 9 years, the plane got retired from the service.
5. It doesnâ€™t have air-brakes and reverse thruster and relies only on wheels to stop.
6. The plane flew at 52,000 feet, 8000 less than where Concorde flew.
7. Tupolev Tu-144 could carry 58 passengers only per flight, 42 less passengers than Concorde did.
8. There was a lot of cabin noise coming from engines and air conditioners. Passengers could talk to each other with difficulty. Furthermore, noise at back of the plane was unbearable.
- Category: Engineering
- Hits: 92
The assembly of 787 Dreamliner was started in June 2006 and the first Dreamliner was delivered in September 2011. The 747 Dreamliner is a beautiful aircraft equipped with efficient engine and spacious interior. The specification of Boeing 787 Dreamliner is as follows:
The 787 Dreamliner comes in 3 different models. Each model has different number of seats, as follows:
- 787-8: 210 to 250
- 787-9: 250 to 290
- 787-10: 300 to 330
- 50% Composites
- 20% Aluminum
- 15% Titanium
- Steel 10%
- Misc 5%
About same as 747 and 777 - Mach 0.85
This is quite amazing. During assembly less that 10,000 holes were drilled. In a 787, 1 million holes were drilled.
20% more fuel efficient than any other similarly sized aircraft.
It produces 20% less emission than similarly sized aircrafts.
The electrical system of Dreamliner 787 consumes 35% less power from engine that any other similarly sized plane.
Design of 787 Dreamliner
It took 800,000 hours on a supercomputer to design the 787 Dreamliner.
It is anticipated that maintenance cost on 787 Dreamliner will be 30% less than any other aircraft.
These were interesting facts about Dreamliner 787. This aircraft comes in three slight variations, namely 787-8, 787-9 and 787-10. The minor differences in these three models is in wing span, height, length, takeoff weight.
Tags: Boeing 787 Dreamliner Interesting Facts, 787 Dreamliner Facts
- Category: Engineering
- Hits: 107
There are many advantages of automatic gear cars, such as:
1. You do not have to worry about putting the gear in "Neutral" before starting the car.
2. You can drive the car without needing to use clutch.
3. You do not need to change the gears because gears change automatically.
4. It is much easier to drive your car in stop-and-go traffic with automatic gears.
5. First time learners find it very easy to learn and drive a car that has automatic gear than ones with a manual gear system.
6. Since automatic transmission system is responsible for sensing when to shift gears and shifting between gears, it can do so much more accurately and more quickly than any driver.
7. Automatic transmissions are safer to drive than manual ones. When both of your hands are free to drive and handle the car, it is certain that it is safer to drive a care with automatic gear system.
Tags: Advantages of Automatic Transmission, Automatic Transmission Advantages
- Category: Engineering
- Hits: 95
An automatic transmission is a type of a vehicle transmission that automatically changes gear ratios as you drive your vehicle and accelerate. There are many advantages of automatic transmission as it frees the driver from having to shift gears manually.
The automatic transmission comes with several gear modes, which allow the driver to select the appropriate mode as required by the driving condition. The different gear modes are described below.
Different Automatic Gear Modes
P (Park). This mode locks the movement of the vehicle in any direction. P is the only mode in which cars can be started, other than N (Neutral). The P mode is used when you have to stop and park the car for long time. i.e at your house, office, shopping center parking, etc. In most cars, you
won't be able to pull out the car key from the ignition, unless you put the car in the P mode. A car should come to a complete stop before setting this transmission mode., to prevent damage to the gearbox. In many cars, the foot brake must be applied before taking the gear out of the P mode.
N (Neutral): It is same as P (Park) mode, except that the movement of the vehicle is not restricted. You should use this mode if you are driving in a stop-and-go situation when you do not want to take the extra effort of continuously applying foot brakes when the car should not be moving. This mode can also be used if the car has to be towed. In N mode you can switch the car engine on and off.
R (Reverse): This mode allows the vehicle to be driven backwards. To select reverse, the driver must depress the gear level, press the foot brake or the shift lick button (varies n different vehicles).
D (Drive): In the D mode, you engage the gear, allowing the vehicle to move forward through its range of available gears. How many gear ratios are in the gearbox i.e 4, 5 or 6 or more, vary in different car models.
3 (Third): This mode is not available in all models. When selected, the transmission is limited to the first three gears only. This mode is also recommended when driving downhill.
2 (Second): This mode limits to first 2 gears of the transmission only. It is useful when you want more acceleration, or driving on snow or ice, as well as when going downhill or climbing uphill with heavy load in the car.
1 or L (First or Low): Both 1 and L are used in different cars. This mode puts the car in 1st gear and locks in it. This mode is used if you're going uphill with very heavy load in the car. You can also use this if you are going downhill and wants to increase the braking effect.
Other Non-Common Gear Modes
The following modes are rare, and found in very specific model of vehicles:
S (Sport): The Sports mode operate same as the 'D' mode. The only different in driving the car in this mode is that the gear shifts up much faster, maximizing all the engine power, during acceleration. In this mode, the vehicle also down shifts the gear much faster compared to the D mode, giving the maximum effects of engine braking.
B (Brake): When this mode is selected, the car applies engine braking, used when going steep downhill. This also reduces the driver's needs to apply hard foot brake. This mode doesn't down-shift the gear but uses engine power to reduce pulling, required while driving downhill.
M, -/+ : This option allows the user to manually shift down or up the gear anytime during the driving, by overriding the current automatic gear selection. This mode may be useful when going uphill in a fully loaded car, and the and you suddenly feel need to down-shift the gear to suddenly accelerate the car more. The + option allows you to shift the gear up and _ sign allows you to shift the gear down.
W (Winter): In a very few car models, W mode has been provided. When engaged, the car's second gear is selected instead of the first gear, when start moving. This mode is used when driving on snow or ice, to reduce likelihood of wheel spinning on ice or snow.
D2 to D5: These modes uses only the first two, first three, first four and first five gears only.
- 7 Great Advantages of Automatic Gear Cars
- CVT Transmission Advantages
- Advantages of a 4x4 Car
- Worst Driving Habits to Avoid
Tags: Auto Transmission Vehicles, Automatic Gear Modes
- Category: Engineering
- Hits: 92
Fuel is one of most expensive elements of the operational cost of running an automotive vehicle, other expenses being repair and maintenance expenditures. While not much can be done to reduce the repair and maintenance expenditure, a lot can be done to minimize the fuel cost, utilizing the vehicle under a prescribed distance and road conditions. Due to the tremendous increase in fuel costs, drivers are now more concerned to reduce this expenditure. Important steps to be carried out in this regard are mentioned below, which are not at all difficult to achieve, and can be undertaken with a slight change in driving habits.
Change Driving Habits
Switch Off: If stopped on a traffic signal, or waiting for a friend, or a train is passing, it is advisable to switch off the vehicle. Even switching off for a small time, can be useful, as it may occur several times a day, due to various reasons.
Most Economical Speed: Each vehicle is designed to be most fuel efficient, at a certain speed, which can be called as the most efficient and economical speed. Owners may not be aware of this fact, and may be of the opinion that moving fast will always be economical, which is not true beyond a particular speed. Similarly, moving slow in low gear, will be expensive.
No Frequent Brakes: Often the driver is aware, that his vehicle needs to be slowed down after travelling a particular distance. Thus, he should slow down the vehicle by removing foot from the accelerator, from a distance, and brakes should only be used when absolutely essential. Each application of braking action, wastes some expensive fuel.
Warming of Engine: Engine should not be warmed for an excessive long period, as warming for approximately 30 seconds may be adequate. Additional warming will be achieved as the vehicle moves.
Windows Closed: Windows should be closed, as open windows cause unnecessary aerodynamic drag, due to which extra fuel is burnt. Fuel consumption may be increased up to 10-15 percent on highways, when windows are open.
Tire Pressures: Tire pressures should be strictly in accordance with the recommended pressures mentioned in the owner's manual, since unequal or more/less air pressure will cause extra drag or friction, and affect the fuel economy.
Air Filter Clean/Change: Dirty air filter can cause extra 10-15 percent of fuel consumption, which should be cleaned/changed as recommended by the manufacturer.
Less Weight: Weight in the vehicle may be passengers or load, should be minimized, as each extra weight has to be paid in the cost of fuel.
Use of Proper Gas: Proper octane rating of the gas should be used, mentioned in the owner's manual, which may be Regular, Premium, etc.
Combine Trips: All the work required during a day, including office, school, market etc can be combined wherever possible, which will reduce the fuel consumption.
Walk: It may not be always necessary to use a car, and alternatives such as walking, bicycle, or sharing with a friend, may be explored.
These were tips on how to improve car's fuel economy. If you will follow the above tips, you will be saving a lot of money every month on fuel.
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