Contact Us


Powered by 123ContactForm | Report abuse

Popular posts from this blog

Canted Vertical Tails - Why are the stabilizers on planes like the F-18 and F-22 slanted?

Image
Why are the stabilizers on planes like the F-18 and F-22 slanted? The tail configuration is usually referred to as canted vertical tails, since the vertical stabilizers are canted away from being 90° straight up and down. As illustrated in the below photo of the F-18 Hornet, this design has become increasingly common on modern military aircraft. Canted vertical stabilizers on the F-18 Other well-known examples of this trend include the F-22 Raptor, F-117 Nighthawk stealth fighter, and F-35 Joint Strike Fighter. The feature traces its roots back to the 1960s when canted tails were incorporated into the SR-71 Blackbird and its predecessors, as shown below. Canted vertical stabilizers on the SR-71 Lockheed designers included these canted tails based on early research into stealth technology. As far back as the 1940s, engineers had realized that perpendicular surfaces, like vertical tails, generated strong radar returns. By canting the tails away from 90°, the radar cross-section (RCS) of ...
Read more

DGCA & EASA Module 15 : Part-8 Engine's Bearings and Seals Question

Image
DGCA & EASA Module 15 : Part-8 Engine's Bearings and Seals Question-Answer 1. Main bearing oil seals used with turbine engines are usually what type(s)?. A. Teflon and synthetic rubber. B. Labyrinth and/or carbon rubbing. C. Labyrinth and/or silicone rubber. Ans : Labyrinth and/or carbon rubbing. Explanation: Jeppesen A&P Powerplant Textbook 3-5. 2. If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects, they. A. are in an acceptable service condition. B. cannot be used again. C. must be degaussed before use. Ans : must be degaussed before use. Explanation: Jeppesen A&P Powerplant Textbook 4-26. 3. A carbon seal has which type of sealing arrangement?. A. Full contact with race. B. Full contact with casing. C. Full contact with labyrinth. Ans : Full contact with race. Explanation: Rolls Royce The Jet engine page 92 refers. 4. The highest turbine bear...
Read more

Aircraft Landing Gear

Image
Why do aircraft have only three landing gear? Why not four? Most aircraft today have three landing gear. Two main landing gear struts located near the middle of the aircraft usually support about 90% of the plane's weight while a smaller nose strut supports the rest. This layout is most often referred to as the "tricycle" landing gear arrangement. However, there are numerous other designs that have also been used over the years, and each has its own advantages and disadvantages. Let's take a closer look at the various undercarriage options available to engineers. Tail-wheel or Tail-dragger :  Gear Though the tricycle arrangement may be most popular today, that was not always the case. The tail-wheel undercarriage dominated aircraft design for the first four decades of flight and is still widely used on many small piston-engine planes. The tail-dragger arrangement consists of two main gear units located near the center of gravity (CG) that support the majority of the p...
Read more