Aircraft Definition and 337 Threads

Homework Statement What is the mach number if an aircraft traveling at sea level at 0 degrees with a speed of A)1140km/h b)900.0km/ the answers are 0.995 abd 0.753 in order. I Cant get those. Homework Equations mach number=speed of object/speed of sound The Attempt at a Solution...

hello all, i was reading up on aircraft design one fine day when they talked about landing speed; they have to be higher than one critical speed, the stalling speed. if i remember correctly, is there another stalling speed, the upper limit? reynold's number increases at increasing speed of...

Hey guys, Even iam trying to find out the reason behind the midair stalling of an aircraft if it really exists. The truth is iam not able to get the correct and validated reason for the query. So i request you guys once more to take up this issue and answer this query which is really...

We learn from a very early class that the aerofoil design of the aircraft wings provide it with the required thrust to keep the plane afloat. It is the only upward acting force. And the reason cited for is that the design allows air to rush faster over the upper portion of the wings compared to...

Can anybody tell me how aircraft fly up side down? I'm an under grad aero student and can't see how aircraft do. Can any aircraft theoretically fly up side down?:smile:

http://www.asminternational.org/Content/NavigationMenu/News/HeadlineNews/HeadlineNewsArticle.htm?SMContentIndex=6&SMContentSet=0 Associated Press May 8, 2006

A plane weighing 220 kN (25 tons) lands on an aircraft carrier. The plane is moving horizontally at 63 m/s (141 mi/h) when its tailhook grabs hold of the arresting cables. The cables bring the plane to a stop in a distance of 89 m. (a) How much work is done on the plane by the arresting...

I have 2 problems that are giving me trouble regarding the takeoff anf landing of an air craft. Here are the stats I have so far: Takeoff speed: 33.7m/s Takeoff angle:35 degrees Landing speed: 37.3m/s Maximum Abort speed:30.07m/s Engine Thrust: 1,500N Mass of Aircraft: 1060kg Braking...

Can anyone help me with this problem? A flight attendant pulls her 70.0 N flight bag a distance of 258 m along a level airport floor at a constant speed. The force she exerts is 32.0 N at an angle of 52.0° above the horizontal. Find the work she does on the flight bag and the work done by the...

Well, I am sorry to bother you again, but it seems that after solving my last problem nobody enters that topic anymore :rolleyes: I hope I won't get on moderators nerves here... Well, anyway. As one may remember, I asked about this question: an aircraft flights at height H with a constant...

For two weeks I can't solve this question with my friends. Please help us! an aircraft flights at height H with a constant velocity U. When it passes right above the missile, the missile is fired with a constant velocity V (V>U), but the vector of the velocity of the missile points directly...

I've been told that commercial aircraft don't provide parachutes due to the fact that depressurising the aircraft suddenly to let everyone jump out would kill them. This doesn't add up... If the plane is at 40,000ft, then fair enough, you can't really blow the doors, but if the plane is in...

Does anyone know what kind of time it takes for an aircraft carrie to reach full speed if it starts from rest? Specifically a nuclear powered US carrier (nimitz maybe?). Someone said it takes 5 hours and I am just having a hard time believing it.

http://home.comcast.net/~rossgr1/EAM/mentors.JPG at the museum. I just hope that Greg notices that we were wearing our PF mentor uniforms. EDIT: Ivans post, but I split it out of the aircraft thread. Thought some others might like these pics.

I made a trip to McMinnville Or. to the Evergreen Aircraft Museum. Thought I'd share some pics. Replicas of the Wright Flyer and the first Curtis plane. http://home.comcast.net/~rossgr1/EAM/EAM7.jpg The Spruce Goose. It is simply to big to get into a single image. (I need a wide angle...

I think that the title of the topic is very self explanatory. I want to know what the explanation is for the different implementations, I reckon that it might have something to do with the density of air and water.

For those interested in a remarkable aircraft - Lockheed's A-12, YF-12A, SR-71 Blackbird. http://www.sr-71.org http://www.sr-71.org/blackbird/index.htm at sr-71.org http://www.wvi.com/~sr71webmaster/sr-71~1.htm http://www.fas.org/irp/program/collect/sr-71.htm...

Years ago on the now defunct show Beyond 2000 there was a prototype aircraft being built in Russia that had no wings as such. Its shell had rectangle holes in it that I guess let air get in and flow over tiny internal wings or something. Anyone know what I'm talking about? It was big but not as...

Does Larger aircraft need longer way (space) than smaller aircraft to take off?And why?

What was so special about WW2 era German 88 mm anti aircraft gun later used to great effect as an anti tank gun?

Is it possible to use big gyroscopes to directly control yaw, pitch and rotation of aircraft? Let's make the assumption that the system must be able to produce a specific moment (force couple) for an arbitrary length of time, without the power necessary to do so increasing. An example...

http://www.airliners.net/info/stats.main?id=389

See the attached figure. It is the admision system of an aircraft (I think it admits supersonic flight). The air enters by the left side. But I'm not sure what are these two branches. The branch of above is closed (it is a recirculation of fluid there) and the below one is opened, so the air...

heres the problem: steam-powered catapult used to launch aircraft could "throw a nissan pick-up five miles(8045meters)" catapult has the power to accelerate 30-ton aircraft from zero to 160mph(71.511m/s) in just 2.5 seconds nissan pick up truck weighs 3500 pounds and the flight deck is 57...

Hello I want create a small model of aircraft or helicopter 30-50 cm long which can fly for 3-4 minutes just as a hobby how should i go about? Thanx

Here is a problem, please let me know whether my answer is right or wrong. Locate the position of a spaceship on the Earth-Moon center line such that the tug of each celestial body exerts on it would cancel and the craft would literally be weightless. I found two equations: A...

Francesca, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport. (see pic. attached) She notices that the string makes an angle of 20° with respect to the vertical while the aircraft accelerates for takeoff, which...

I was wondering about the benefits of building a biplane for an aero-design contest. The rules state a particular wingspan limit, but there is no limit on number of wings. There is also a limit on the type of engine. The plane that’s able to lift the heaviest payload and still be controllable...

I would say that combat surface ships not to mention aircraft carriers, are obsolete(sitting ducks) when it comes to "real" war for example with china or iran.During Falklands war exocet rockets wrecked havock among british ships. Would not be prudent then, to develop new class of...

Falling from an aircraft...effects? Deploying something from an aircraft or helo...what are the different forces that are going to act on that object, or rather, where would I find information about that. Say a relatively light box is dropped out of a moving helo, how would I go about figuring...

http://www.theglobeandmail.com/servlet/ArticleNews/TPStory/LAC/20040410/PLANE10/TPNational/Canada http://spaceflightnow.com/news/n0211/22parachute/ The technology to apply this to commercial aircraft already exists though the Apollo program. Aviation will never be the same. Edit...

I watched a "Black Aircraft" show on the science channel. In the show they mentioned a researcher working on old Russian technology that placed a strong beam in front of the aircraft to strip electrons from the air molecules so the plasma creates its own initial shockwave to lessen drag on...

http://www.detnews.com/2002/schools/0212/03/c03-24756.htm Detroit News-Darren Jacobs "Dearborn High School students Ethan Rein, Jim Bergren and Luke Duncan are breaking the law -- of gravity. ___Rein, a senior, and juniors Bergren and Duncan, have built an anti-gravity aircraft that...

I am trying to gain an understanding of how Stealth technology defeats conventional radar, and wondering about strategies to get around it. In addition to explaining the basics of the Stealth technology, can someone explain why the planes are not simply detected by infrared sensitive devices...

A jet airliner moving initially at 795 mph to the east where there is no wind moves into a region where the wind is blowing at 140 mph in a direction 56 degrees north of east. What is the new speed of the aircraft with respect to the ground? Answer in units of mph. how can i start this off

Can someone tell me what would happen if you made an oval light aluminum container, filled it with lighter than air compressed gas like helium, strapped a rocket to the end of it, and sent it flying. Let's say you add a rudder or tale to the end of it and then a gyroscope to the center of it...

Just a little question again. Which law explains the best why an aircraft can fly? A The ideal gas law of Boyle Gay Lussac. B The secound law of Newton. c The basic law of aerodynamics of Bernouilli.