Airplane Definition and 350 Threads

The video shows some optimisations on the turbofan engine and reaches the conclusion it needs to be about 4m. The premise is that accelerating more air a little is more efficient than accelerating less air to a higher acceleration and speed, fact mentioned in all aerodynamics books, and that...

Homework Statement US Air Force C-17 Globemaster III aircraft were used to airdrop food to Afghan refugees in the early stages of the war against the Taliban in 2001. Calculate how far ahead of the drop zone a pilot would have needed to drop humanitarian aid packages if the delivery occurred at...

Homework Statement A small airplane wants to fly from A to B which is 200 km due south. The wind is blowing towards the east at a velocity of 50 km/h. If the airplane can move through the air at 300 km/h, find the direction the plane should be heading; the speed of the airplane relative to the...

Hello! When calculating the load factor in a loop the formula is n=V^2/(g*R)+cos(teta) during pull-up of a loop and another formula is n=1/cos(phi) during a level-flight banked turn. How does one combine these to calculate the load factor during a twisted loop?

Homework Statement [/B] "An airplane is flying on a bearing of 340 degrees at 400mph. A wind is blowing at a bearing of 320 degrees at 30mph. Find ground speed and direction of the plane." Homework Equations vx=vcosϕ vy=vsinϕ The Attempt at a Solution [/B] First, my teacher told us to change...

I have to admit I am not good on physics but I am willing to try to understand how is possible for a plane or a glide that's falling without thrust applied downward to make a loop (by changing direction or using the elevators on the tail of plane, like in this picture. I am try to write a...

Homework Statement [/B] A plane leaves the airport in Galisteo and flies 180 km at 67.0 degrees east of north; then it changes direction to fly 255 km at 49.0 degrees south of east, after which it makes an immediate emergency landing in a pasture. When the airport sends out a rescue crew, how...

Homework Statement I'm working on this to further my understanding of parts used in an aircraft braking system. Using known weight, and constant acceleration determine braking moment for a tricycle gear airplane with two main landing gear brakes. Mass- 12,292 kg Acceleration: -1.4 m/s^2 Tire...

This is a supersonic plane with a bi plane layout Date: March 19, 2012 Source: Massachusetts Institute of Technology Summary: A researcher has come up with a concept that may solve many of the problems that grounded the Concorde. An assistant professor of aeronautics and astronautics, says the...

Did you think that dropping turkeys out of an airplane was only a hilarious episode from "WKRP in Cincinnati"? (I think I just dated myself.) Think again...

Homework Statement After flying for 15 min in a wind blowing 42 km/h at an angle of 31° south of east, an airplane pilot is over a town that is 50 km due north of the starting point. What is the speed of the airplane relative to the air? Homework Equations Vx of wind=42km/hr*cos(31) Vy of...

Homework Statement A bomb is dropped from an airplane at an attitude of 14400 ft. The plane is moving at 600 miles per hour. How far will the bomb move horizontally after it is released from the plane? Homework Equations I use the formula involving the distance traveled by an object with no...

This isn't for any particular project or assignment, but I've tried solving this in the past and haven't figured it out. Say you have an RC seaplane, like the one pictured, with the engine mounted well above and aft the CG. You're going to need to angle it down a little to counteract the...

in science shows , an airplane made to fall freely under gravity has its passenger floating in mid air i understand weightlessness is due to 0 normal reaction by floor on person but since both passenger and plane have same aceleration due to gravity what might be reason for relative separation...

Hello! (Wave) An airplane is at the position $(3,4,5)$ at noon and travels with velocity $400 i+500 j-k$ kilometers per hour. The pilot detects an airport at the position $(23, 29,0)$. How can we find the time at which the airplane will pass exactly over the airport? We suppose that the Earth...

Homework Statement An airplane with a mass of 5.32 x 10^4 Kg accelerates down the runway at 1.76 m/s^2 [forward]. Calculate the net force acting on the airplane. Homework Equations Fnet=ma The Attempt at a Solution I did this by multiplying the two given values, but my answer was 93632N...

The following link explains that "it serves as a bleed valve, allowing pressure between the air in the passenger cabin and the air between the outer and middle panes [an airplane window has three panes] to equilibrate", yet it mentions that it is "a failsafe designed to hold the cabin pressure...

Homework Statement How does the altitude of an airplane affect the measurement of the velocity, when using a Pitot tube to measure the speed? The Pitot tube is horizontal, with one end open and another closed. The stagnation pressure is measured at the end of the Pitot tube, and the static...

Homework Statement A horizontal Pitot tube (with one end open for airflow and another closed) is accidentally installed into an airplane askew, so that the tube is not horizontal. Instead the closed tube end is higher (in the y-direction of a xy-plane) than the inlet end. How does this affect...

Malaysia hunts owners of Boeing 747s abandoned at airport (CNN) Maybe the owner(s) died or something...

boneh3ad submitted a new PF Insights post How Does an Airplane Wing Work: a Primer on Lift Continue reading the Original PF Insights Post.

Hi, I'll start by saying I'm new here. I'm in my first year at college and I want to be an inventor. My question is this - if there was an airplane propeller that could pull on air instead of pushing against it to create thrust, would it be more effective at 1. creating thrust and 2. avoiding...

Yes it can, and surprisingly well. Conventional wings tend to be typically: 1. Large (lots of area) 2. Thin (thickness/chord < 15%) 3. High aspect ratio (span/chord > 6) A common example of a wingless airplane would be a lifting body. Benefits of wingless airplanes: 1. Compact (encloses...

Flying against the wind, an airplane travels 3420km in 6 hours. Flying with the wind, the same plane travels 2670km in 3 hours. What is the rate of the plane in still air and what is the rate of the wind?

Homework Statement A Red Cross airplane is traveling horizontally east at velocity v_0 = 80.0 m/s and height h = 350 m above the ground. The plane carries emergency supplies for a village inaccessible by road. The plane will drop the package (without a parachute) into a pile of soft hay...

Apologies up front for the long question … I have tried to be brief. I want to define camera angles for Google Earth (GE) when rotated about an aircraft yaw axis. The input is Latitude, Longitude, Altitude plus Heading, Pitch and Bank angles, actually coming from Flight Simulator. These drive...

Homework Statement A pilot with an airspeed of 500 km / hr wants to fly from City A to City B (which is exactly 700km North of City A); however, there is a wind from the West at 50 km / hr. In which direction should the plane fly in order to arrive directly at it's destination. Homework...

Hi guys, I've been reading a bit and watching a few youtube videos on electric aircraft, but have come across little to do with supersonic aircraft. As far as I understand it an electric aircraft would use basically fans to push air behind it and as such generate thrust. The problem would be...

Homework Statement [/B] Keep in mind this is a Top Gun-themed homework assignment. Cougar comes in for a shaky landing. His 20422 kg airplane traveling at 85 m/s strikes the deck at 3.5 degrees below the horizontal. Cougar's plane snags the landing cable stretched across the deck. The landing...

I'm confused about how an airplane generates lift. If I'm correct the wing of the plane is bent so air can flow over the top of the wing faster than the bottom of the wing, the faster fluids somehow apply less pressure resulting in a net upward force. Why though does a bent wing allow air to...

Homework Statement An airplane goes into a turn 3.6km in radius. If the banking angle required is 28 degrees from the horizontal, what is the plane's speed? Homework Equations Newton's Second. The only forces acting on the plane are gravity and the normal force. This isn't given in the...

Hello. Do you think the idea of placing the jet engine at the front is plausible? Why? Why not? Thanks Yrjosmiel

Homework Statement Assuming you know general specifications of the airplane such as span of the wings and maximum speed, calculate the voltage that is induced when the airplane is flying horizontally through Earth's magnetic field where both the horizontal component and vertical component of...

Homework Statement An airplane has a 50 m^2 wing that is designed so that air on the top travels 20% faster than the air on the bottom. The air on the bottom of the wing moves at the plane’s airspeed and the unloaded airplane has a take-off speed of 90 km/h A) What is the velocity of the air...

Homework Statement For monoplane of Clark Y wing, 36-feet by 6-feet, with 3.8 sq ft. equivalent flat plate area, what should be the airspeed for minimum Horsepower when fuel has been burned so that the total weight is 1800 lb? Homework Equations Wing Area = 36 x 6 = 216 Weight = Lift Weight =...

Homework Statement A 65 kg airplane pilot pulls out of a dive by following at constant speed, the arc of a circle whose radius is 300 m. At the bottom of the circle her speed is 180 km/h. a.) Calculate net force on pilot at bottom or circle. b.) Calculate force exerted on pilot by seat at top...

Homework Statement An airplane of mass 25,000 kg (approximately the size of a Boeing 737) is coming in for a landing at a speed of 72 m/s. Calculate the normal force on the landing gear when the airplane lands. Hint: You will use 0.92 m as the compression (vertical displacement) of the landing...

Homework Statement An airplane is ascending at an angle of 10 degrees is detected 2000m directly above an observer after 20 seconds the angle of elevation to the plane is 48 degrees. How fast is the plane going?Homework Equations The Attempt at a Solution I just don't know what to do next, I've...

An introductory picture. Homework Statement Its number in my physics exercise book is 1.147. (just for reference, though completely unimportant). The actual problem description is written below. An airplane is flying from point A to the point B which is 400 km west from the point A...

Q: The pilot of an aircraft flies due east relative to the ground in a wind blowing 20 km/h toward the south. If the speed of the aircraft in the absence of wind is 70 km/h, what is the speed of the aircraft relative to the ground? I set up the vector of wind WRT ground pointing due south...

I want to derive some equations for a 2-D airplane's motion, specifically when it lifts off and lands. Can someone show me where I can start and how I can use differential equations to develop equations like the speed/position of the airplane in its x and y components? Also, if anyone is...

if an airplane is on a treadmill and both are at the same speed but the plane is going opposite the treadmill, so they remain at the same exact speed, will the plane take off? Apparently there are many answers to this. - - - Updated - - - i was talking about it today and now i want to hear...

Homework Statement I have to write a C# program for an assignment for school. Programming is not a problem, but physics is :P So I am kindly asking you guys for helping me out with this.. Sorry for my bad english, I'm not a native speaker. A glider pilot starts a back-loop with a plane...

I am trying to measure the lift to drag ratio of a wing. I am measuring the lift by using a electronic scale. But how on Earth can I measure the drag force?

Hi PF, I'm moving to the UK from the US to start on a M.Sc. in plasma physics this fall. I really want to take some of my undergrad textbooks with me, but the shipping charge is outrageous. There are about 4 books that I must have, but I'd prefer more than that. A 10lb Fedex box said it...

I am looking for an equation that correlates material failure and collision speed; so that I can better understand the effects of size and speed on model airplane crashes. Is there an equation that correlates an object's length and speed to material failure, for one-dimensional elastic...

When looking at the shape of an airplane wing from the side, like here I'm wondering what makes the air move faster above the wing. I have some questions about this: 1. It rather looks like there is a longer distance for the air to travel above the wing than below it, but wouldn't a longer...

Homework Statement If a clock in an airplane is found to slow down by 5 parts in 1013, (i.e. Δt/Δto = 1 + 5x10-13), at what speed is the airplane travelling? (Hint: You may need to use the binomial expansion for γ.) To be honest, I'm really confused about what this question's telling me...

This is not homework but rather a concept question. If there was a siren on the front of an airplane that is traveling greater than the speed of sound, would there still be a sound emitted? If the airplane was traveling toward me what would be the frequency? Would I heart it? Where...

Homework Statement An airplane flies with a velocity of 55.0 m/s [ 35o N of W] with respect to the air (this is known as air speed). If the velocity of the airplane according to an observer on the ground is 40.0 m/s [53o N of W], what was the wind velocity? Homework Equations...