Lift Definition and 614 Threads

A surface lift is a means of cable transport for snow sports in which skiers and snowboarders remain on the ground as they are pulled uphill. While they were once prevalent, they have been overtaken in popularity by higher-capacity and higher-comfort aerial lifts, such as chairlifts and gondola lifts. Today, surface lifts are most often found on beginner slopes, small ski areas, and peripheral slopes. They are also often utilized to access glacier ski slopes because their supports can be anchored in glacier ice due to the lower forces and realigned due to glacier movement.
Surface lifts have some disadvantages compared to aerial lifts: they require more passenger skill and may be difficult for some beginners and children; sometimes they lack a suitable route back to the piste; the snow surface must be continuous; they can get in the way of skiable terrain; they are relatively slow in speed and have lower capacity.
Surface lifts have some advantages over aerial lifts: they can be exited before the lift reaches the top, they can often continue operating in wind conditions too strong for a chairlift; they require less maintenance and are much less expensive to install and operate.

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  1. babaliaris

    Torque with Infinity length can lift anything?

    I was always wondering if you can lift anything (no matter how heavy it is) if you just use a really long pipe. Or does torque increases in a way like ##e^x## , ##a^x## and after some point it barely increases? Also if this can be explained mathematically, I would love to see it.
  2. K

    Need help in finalizing the vacuum pump to lift an object

    Hi, I have been asked to identify the right vacuum pump to lift the object having 500 grams weight with one suction cup. I am going through lot of materials to identify correct formulas to calculate the lifting force. and now I am able to calculate the theoretical lifting force. But seems, I am...
  3. AnkitM

    Electrical Build an electromagnet which can lift up to 3 kg from 26 gauge copper wire

    Hey guys I want to build electromagnet which can lift up to 3 kg from 26 gauge copper wire, 12V battery (bike), so how many turns should I do and what will be length and radius of the solenoid?
  4. R

    Relative velocity between lift and screw

    v=16m/s+4*.659s=18.636m/s (for lift) v0=16m/s-9.81*.659s=9.53m/s my question is that why 16m/s is considered for screw velocity ? it is given for lift .what does it mean 9.53m/s? If you drop something , it gets acceleration and I calculate it 6.45m for screw while falling and why should I...
  5. O

    Auto/Motor Centrifugal compressor lift aircraft -- engineering help please

    Hello, I have a design for a different type of aircraft. I wanted an actual engineer to give advice before I fork over for some parts to try and make a working model. Attached are some pics. some of the pics are as if it were a full size acft. But for the model I was just going to use two turbo...
  6. li dan

    Can an aircraft using a geomagnetic field generate lift?

    As shown in the figure, the aircraft includes a geomagnetic field convergence layer, which is a superconductor material. The geomagnetic field convergence layer repels the direction of changing the geomagnetic field, so that the geomagnetic field passes between the upper and lower converging...
  7. J

    Hovercraft Lift: Measuring Clearance Height & Lift Force

    << Mentor Note -- thread moved from the technical forums so no Template is shown >> Hello, I built a hovercraft not long ago for an experiment. What I did was applying more power to the motor and looking at how high the hovercraft could go. However, the formula that I was planning to use, uses...
  8. S

    Calculating Air Speed Diff. of Plane Lifts

    Homework Statement We have a plane which lift area is A=500 m2 and weight of plane is m= 540 000 kg. That the plane can stay in air the pressure difference between top and bottom of the lifts have to be: B>G --> Δp= (m*g)/A = 10 594.8 Pa. Homework Equations Bernoulli equation The Attempt at...
  9. P

    Force to lift a pyramid that is sitting in a water tank

    Homework Statement A pyramid weighing 4000 lb has a base 6ft square and an altitude of 4ft. The base covers an opening in the floor of a tank in which there is water 4 ft deep. Underneath the floor of the tank and on the water surface there is air at atmospheric pressure. What vertical force is...
  10. TechTree

    Auto/Motor Finding a Drum for Motor Shaft to Lift 5kg Box

    Hello, I'm trying to use this gearbox motor as a winch to lift up a small box (5kg), however it needs to have some sort of drum that's mounted to the motor shaft to wrap the string around. Although I'm unable to find anything suitable that I could use. Is there already something that exists that...
  11. K

    Lift and Drag force in a Wind Tunnel

    Hello guys, I am trying to calculate the lift force and drag force in a wind tunnel at my school as a part of a project that i am doing. I am varying the length of the airfoils and trying to measure the lift force and drag force. I have 3-d printed 7 airfoils. However, I am not able to find any...
  12. Quintijn van Heek

    Using the lift equation, can you make anything fly?

    If I have a contraption with wings that weighs 120 kg, the wings in total are 2 meter squared, and I make it go 60 km/h, will it fly? According to the lift equation (L = (1/2) d v^2 a CL), it should, since L=(1/2)*1.225*277.788*2*3.39 = 1176.789 Weight = 120 kg = 1176.789 N L = lift = 1176.789...
  13. M

    The right reason for lift force on an aerofoil

    On the internet, I found two different explanations for lift force. In one of the explanations, bernoullis equation was applied between the stream flowing under and the stream above the aerofoil(the stream above moves faster and so less pressure than the lower). The other explanation says...
  14. SIDDHARTH MANWANI

    How to calculate the force required to lift an object into the air (helicopter)

    Hey everyone,I am trying to make a helicopter using an AVR or ARDUINO BOARD I wanted to know how do I calculate the force required to lift the helicopter.Can anyone also help me how much revolutions per minute(r.p.m) should the fans generate.I am planning to use two fans.
  15. bob012345

    Can a Vertical Lift Engine Hover With 30 Pounds?

    I'd trying to design a vertical lift engine to lift about 30 pounds in the air about one foot off the ground with minimum power. The device has to hover. The engine should itself weight 5 pounds or less and have a footprint no larger than one square foot. By minimum power, I mean something like...
  16. Suyash Singh

    Why Is the Calculated Velocity for Lifting a Person in a Wind Tunnel So Low?

    mass of air X velocity = mass of man x gravity (10000)x(v)=60x10 velocity=600/10000 how come velocity is so less? I am still in school so forgive me if my calculations look stupid.
  17. D

    Particle Entrainment in a Counter-Current Flow Reactor

    Hi there, I am currently looking to build a rotating kiln to provide the necessary heat/res. time/gases to react a solid feedstock. The problem that I can envision, however, is that the solid (which is fed as small particles) may become entrained in the counter-current gas flow inside the...
  18. F

    Pressure and Lift around a Wing

    Hello everyone, I am pondering on the airflow around a wing: When air flows over a wing, part of the air goes below the wing and part over the wing. Even when the air is moving, the pressure at a point in space is always isotropic. The pressure on top of the wing is slightly lower than than...
  19. K

    How Much Force is Needed to Lift a Shed Hatch?

    I plan to build a hatch door in one side of my shed. The plan is that the hatch door will be hinged at the top long edge. The hatch door will open from the bottom long edge. The hatch door will open out and up to a horizontal position (possibly slightly past horizontal). My question is what...
  20. P

    Lifting a Man with 100m^3 of Helium

    Hi, Reading about different ways to lift a human being, I've come to realize the easiest is simply manipulating density as follows: Denisty of Air at STP: 1.20 kg/m^3 Density of He at STP: 0.000179 kg/m^3 Therefore for every cubic metre (m^3) of air displacement, lift achieved is ~1.2 kg/m^3...
  21. F

    Airplane lift, take off and loading capacity

    Hello Forum, I understand that an airplane can fly when its overall weight ##W_{plane}## (force pointing down) is perfectly balanced by an upward directed force called lift ##F_{lift}##. If the lift is larger than the weight, the plane will rise in height. When the airplane is empty and...
  22. R

    Lift and screw impact velocity

    Homework Statement Consider the elevator and screw in Example 2-17. Assume the velocity of the elevator is 16 mls upward when the screw separates from the ceiling. (a) How far does the elevator rise while the screw is falling? How far does the screw fall? . I have only problem second part of...
  23. Leo t

    Rotary motion to lift a dump truck

    Homework Statement In my robotics class I was task with creating a robot to lift and house objects, I have the lifting mechanism, and a housing area, but I can't figure how to get the bucket of the robot to dump using a rotary motor. Homework EquationsThe Attempt at a Solution Tried to fixate...
  24. Sandeep T S

    I Gravity Inside and Outside a Moving Lift

    Yesterday I post a thread, this post is continue of that one. In pic 1 lift is accelerating. A observe inside the lift would assume that he is on planet. if he is on planet time slow on ground and fast in sky. Pic2 shows gravitational field, that have high magnitude in bottom, low at...
  25. Sandeep T S

    B Einstein's Lift Experiment: The Principle of Equivalence

    In Principle of equivalence, we indroduce to the theoram by a lift experiment, my question is why the lift is fully closed one, why the observer in lift forbidden to observe out side world
  26. T

    How to get greater lift from an aircraft wing

    I want to know about how to get more lift from aircraft wings without increasing engine power and wingspan.
  27. K

    Lift coefficient of rocket at vertical flight

    Hi, I am looking into aerodynamic parameters for rockets (ogive nose, cylindrical body of different diameters, four fins at bottom) and have a question about the lift coefficient. If a rocket is launched vertically, with zero incidence angle and wind, would that result in a very small lift...
  28. Victoria_235

    How Does a Lift's Acceleration Affect the Pulley System Dynamics?

    Homework Statement Two blocks are attached by strings of negligible mass to a pulley with two radii R1=0.06 m and R2=0.08 m. The strings are wrapped around their respective radios so that the masses can move either up or down. The pulley has a moment of inertia I=0.0023 kgm2 , and is supported...
  29. S

    Pump has a suction lift of more than 10.3 m

    As I was going through a course on Hydraulics, there was a brief explanation about how the atmospheric pressure can only support a water column of 10.3 m.A few more points that are prerequisite to the discussion are as follows 1)A fluid cannot be pulled;it has to be pushed. 2)A centrifugal...
  30. N

    Simple Machines Revisited + more - making 2.5 ton lift

    I always seem to get into "big" projects these days and need to whip out some math that has a lot of cobwebs. I'm not too worried about injuring myself... but I don't want to inadvertently have something break over a vehicle bed / trailer. I think most of the system components are good... I...
  31. G

    Does a Pendulum Stop Swinging in a Falling Lift?

    Assume a pendulum was swinging in a lift. If the cable breaks and the lift starts to accelerate down at g would the pendulum stop swinging and freeze in its current position? Merry Xmas. G.
  32. P

    Power required to lift something vertically

    Homework Statement I'm using a force of 392 pound feet of force to move an object that weighs 250 lb a distance of 22 in in 1.3 seconds.. how do I determine how much power was consumed in this move?[/B] Homework Equations Power = force * distance/ time The Attempt at a Solution 749 watts
  33. Dalton Peters

    Can a Jet Plane Take Off on a Treadmill?

    So I have heard this around the internet before but thought is was a question worth exploring if a jet plane is sitting on a treadmill and the treadmill moves backwards at the same rate the plane is moving forward will it take off? I think no because the plane would have to be moving forward for...
  34. L

    Force and Power Required to Lift an Elevator Car

    Homework Equations P = W*V Fnet = ma V = 3.0 m/s W = 29.9[/B]The Attempt at a Solution I think i got this wrong, but I want you to check if my answer is right :( Heres what i did: So, P = force * velocity P =force*3.0 m/s force = force due to gravity + acceleration (net force) is F = ma =...
  35. Jeffsg605

    How Do You Calculate Helicopter Rotor Lift Using the Lift Equation?

    I am trying to calculate the lift generate by a helicopter rotor using the lift equation, which is L = \frac{1}{2} \rho V^2 * C_L * S \\ where \\ \rho\mbox{ = density} \\ V\mbox{ = velocity of a point on the rotor} \\ C_L\mbox{ = lift coefficient} \\ S\mbox{ = surface area swept out by the...
  36. P

    Will a block slide in a moving lift with equilibrium?

    Homework Statement Homework Equations The Attempt at a Solution [/B] Effective gravity = g-a So Frictional force = tension Tension = m(g-a) u 2m(g-a) =m(g-a)
  37. R

    Lift and Drag Force in ANSYS CFX

    How i can know the magnitude of lift and drag force from ansys cfx?
  38. S

    Chordwise location of lift for wing structural design

    Hi everybody, I'm designing the wing of a new aeromodel and I need a few informations for the structural design of the wing box that I couldn't find in the few litterature I have by now. So, here comes the question... For the sizing of the box beam that will be the main resistant part of the...
  39. PsychonautQQ

    I Impossible to lift the identity map on the circle

    Suppose that L: ##S^1## ---> ##R## is a lift of the identity map of ##S^1##, where e is the covering map from ##R## to ##S^1##, where ##R## is the real numbers and ##S^1## is the circle. Then the equation e * L = ##Id_{S^1}## (where * is composition) means that 2*pi*L is a continuous choice of...
  40. R

    Equilibrium Question -- Thrust versus Lift....

    Homework Statement Given: Thrust: 103000 N Lift = ? Weight = 86500 N Resistance = ? Homework Equations I'm just to figure out the value of resistance and lift. The Attempt at a Solution I can't seem to figure out a way to find out resistance, but with lift I believe it has something to do...
  41. yecko

    Calculating Coefficient of Lift: Angle of Attack of 7°

    1. Homework Statement https://i.imgur.com/tG9unNs.png 2. Homework Equations in picture below 3. The Attempt at a Solution https://i.imgur.com/egZC3Ay.jpg I calculated the angle of attack is "7", yet the answer is "1", which implies the coefficient of lift is about 0.2 from the answer. I...
  42. F

    What is the angle of attack for a Rogallo wing and how does it generate lift?

    Does a Rogallo wing generate a lift at all ? If yes, how ? It does not seem to have wing profile to generate lift.
  43. C

    How to Calculate when A Roll Back Would Occur on a Ski Lift

    Hello! First off, here is a video of what a roll back is: Here's my question: How could I determine how much of a load the lift is carrying for there to be a loss of friction between the haul rope (the cable) and the bull wheel (the main wheel at both the top and bottom terminals), causing...
  44. C

    What Physics Topics Relate to Ski Lifts?

    Hello Everybody! I am looking for some help in formulating an investigation topic relating to ski lifts. What measurable physics topics relate to ski lifts? One idea I came up with how much downward pressure of riders on a chairlift would overcome the friction of the haul rope (the cable) on...
  45. I

    Minimum Mass required to lift up an object from a spring

    Homework Statement FInd min mass so that block loses contact with ground. Spring is initially in its natural length, the mass attached to spring is on ground(M) Homework Equations Equations of conservation of energy The Attempt at a Solution Min compression = 2mg/k to lift up object, Normal...
  46. T

    What determines the maximum weight an electric motor can lift?

    What determines the maximum amount of weight an electric motor can lift / move for its size? So assuming the electric motor weighs a specific amount, what would be the limiting factor to how much weight it can move / lift for the weight it weighs?
  47. T

    Predicting lift on an Aerofoil with varying Angles of Attack

    I am conducting a school based EEI and have found issues in predicting lift on an aerofoil with respect to angle of attack.I understand the formula for lift is L = (1/2) d v2 s CL. I also understand there are many confusing variations to the calculation for the lift coefficient but i am yet to...
  48. S

    Lift equation and pressure coming out of a tube?

    I am making a small project at home for my solar panels. I have made a similar project when I was in school but I can't remember the equations. I want to attach an air compressor to a tube then install it on top of a solar panel, and pinch a few holes in it to clean the dust that accumulates...
  49. Builder

    Air Pressure Lift: Lifting 250 lbs 6-12

    How much air pressure, from six 1inch in diameter pipes, would it take to lift something no more then 250 pounds about six to twelve inches off the ground?P.S. This is a personal question not, homework.
  50. CharlohAwk

    Is it possible for a feather to lift a car?

    I'm no physics major... And I have no formal education... I just have a task that I wonder if could be possible... Could a feather lift a car? Could you use the weight of a feather and the proper lever system or systems to lift a standard sized car off the ground?
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