Short-Question

# What is the lift coefficient of a Boeing 747?

## What is the lift coefficient of a Boeing 747?

0.52
A Boeing 747 is flying at an altitude of 12,192 meters and has a velocity of 265.5 m/s. The aircraft has a wing area of 510.97 m2. The coefficient of lift is 0.52 and the density is of air at 12,192 meters is approximately 0.30267 kg/m3. The weight of the 747 is 2,833,500 N (637,000 pounds).

How do you calculate lift coefficient?

To calculate coefficient of lift:

1. Multiply fluid pressure by velocity squared and divide the product by 2.
2. Multiply the surface area with the preceding product.
3. Divide the lift force by the product.

### Is the F-117 still stealthy?

An F-117, with its drag chute deployed, after landing at Fresno-Yosemite International Airport on Sept. 13, 2021. “When you look at 117s that come and land and do that stuff, they’re a stealth platform, right?” Loh said. “Early days of stealth, but they’re still a stealthy platform.”

What is a good lift coefficient?

Lift Coefficient: Incidence The value of C L max is a very important airfoil characteristic because it determines the minimum speed at which an airplane can fly. A typical value for the type of airfoil section mentioned is about 1.5.

## What is the best lift to drag ratio?

This is especially of interest in the design and operation of high performance sailplanes, which can have glide ratios almost 60 to 1 (60 units of distance forward for each unit of descent) in the best cases, but with 30:1 being considered good performance for general recreational use.

What is the value of coefficient of lift?

Lift Coefficient: Incidence A typical value for the type of airfoil section mentioned is about 1.5. The corresponding value of α s is around 18 degrees.

### How do you calculate lift and drag?

The lift/drag ratio is used to express the relation between lift and drag and is determined by dividing the lift coefficient by the drag coefficient, CL/CD. A ratio of L/D indicates airfoil efficiency. Aircraft with higher L/D ratios are more efficient than those with lower L/D ratios.

You can only purchase this F-117 for use as a “static display” anyway, so sticking this Nighthawk in your garage to try to get running again is out of the question. Instead, the listing suggests that you could restore the jet for display purposes for right around \$300,000.

## What does a low lift coefficient mean?

A low drag coefficient implies that the streamline shape of the vehicle’s body is such as to enable it to move easily through the surrounding viscous air with the minimum of resistance; conversely a high drag coefficient is caused by poor streamlining of the body profile so that there is a high air resistance when the …

When was the F-117 stealth fighter developed?

F-117A Nighthawk stealth fighter attack aircraft was developed by Lockheed Martin after work on stealth technology, and the predecessor test demonstrator aircraft, Have Blue, was carried out in secret from 1975.

### What kind of drag does the F-117 have?

Highly swept wings are also poor performers at low speed, producing considerable lift induced drag, the F-117A will almost certainly have a narrow range of optimal high subsonic operating speeds where the parasitic and lift induced drag terms appropriately balance.

What was going to be the replacement for the F-117?

The F-117 was to be replaced in the USAF by the F-22 Raptor before the F-22 programme was cancelled in 2009 and replaced with the cheaper and more versatile F-35 Joint Strike Fighter.

## How is RCS reduction used in the F-117A?

Shaping has thus been the principal RCS reduction technique used in the F-117A design. In addition, radar absorbent materials were used for some panels and radar absorbent coating over the area of the aircraft.