# Questions tagged [drag]

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### How does an airflow sensor work?

There are 4 piezoresistive sensors placed at position A, B, C and D.1 I searched for the working principle of an airflow sensor and I saw this. If I am trying to identify the expected displacement ...
1 vote
41 views

### Why do wing-tip vortices cause an induced angle of attack upstream?

My question is the following. Wing-tip vortices induce a downward flow on the root side of the wing. So, if this induction happens at the wing, and these vortices are then shed downstream, why is ...
67 views

### Wooden Sailing Ships - Why The Drag Pieces of Common Logs Were Shaped like Sections of a Circle?

I was reading the website What is the difference between a nautical mile and a knot?, and it said The common log was a rope with knots at regular intervals, attached to a piece of wood shaped like a ...
282 views

### Drag force and coefficient for cylinder through water

Pushing a cylinder through the water with an angular velocity of $\omega$. The cylinder diameter and length are $D$ and $L$ respectively and the length from the rotation point to the center of the ...
47 views

### Is there a way to simulate the drag effect created by acceleration while in a stationary object?

There was a video of a train that had tvs in the windows so it appeared the rider was moving across the landscape. If the train was stationary the passenger would not believe the ride was real because ...
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### Drag coefficient of a complex object made using simple objects (with known drag coefficient) in small Re?

Let say you have an object made of simple objects (figA1). You know the drag coefficients of simpler objects (here spheres and rods, figB1). Is there a way to estimating the drag coefficients of the ...
1 vote
853 views

### Is the drag coefficient/velocity of of a vehicle based on frontal area?

Does the frontal area of a vehicle determine the velocity/drag coefficient of a car? A Ferrari 458 has a Cd of 0.33 while a Corvette C6 has a Cd of 0.29. Does this mean the Corvette will have less ...
99 views

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### How does the pressurized suspension of the Hyperloop not affect the tube pressure?

So one of the proposed suspension systems that will be used on the hyperloop include the externally pressurized air cushions. These cushions lift (or at least help lift) the capsule and reduce drag ...