Fluid Drag Head
Are drag and viscosity the same force?
After I was flying a remote control airplane, I had a picnic with my friends. One of them brought honey and this idea popped into my head.
Also, if gravity is the weakest of the elementary forces, why do things fall to earth instead of being reflected by the charge in aerial particles or the ionosphere? I know this is more of a fluid dynamics question, but I’m wondering why does it matter how many atoms there are to get in the way of another body. Shouldn’t some of the atoms get trapped in between the descending body and the earth so that there’s a point where the object just floats above the earth, or is air pressure what we call the resistance applied by the atmosphere’s atoms which are repelling the falling object (then, as the object approaches the ground, the imperfect positioning of the air’s atoms results in it getting squished out to the side from between the falling object and the ground)?
Good question, Mikey C!
Drag is the force of resistance created by motion through a fluid. It is a force, and in aeronautics it is usually opposed by the force generated by the engine(s), called thrust.
Viscosity is the relative thickness of a fluid. Honey and molasses are very viscous. Water is not very viscous. Air is a fluid that is even less viscous.
A more viscous fluid will produce more drag, given the same velocity.
Tryumph is right, because the earth is so very, very large even a relatively weak force like gravity is very large as well. Darn it! Would be fun to leap 100 feet into the air!
Finally, air flowing at subsonic velocities is virtually incompressible, like water. So it simply is pushed out of the way by the descending object. Seems counter-intuitive, but true.
Hope that helps!
PROFESSIONAL VIDEO TRIPOD WITH FLUID DRAG HEAD WF718
|
|
Ravelli AVT Professional 67 Video Camera Tripod with Fluid Drag Head $73.99 The Ravelli AVT is constructed of pressure treated aluminum and is unrivalled in stability. This tripod incorporates a unique center brace strut system, reliable quick-action leg locks, non-rollback center column, and rubberized feet with retractable metal spikes. The Ravelli AVT is a high performance fluid drag video head that provides continuous drag control and operates on both pan and tilt… |
|
|
Manfrotto 701HDV Pro Fluid Video Mini Head $139.11 Developed specifically to support the latest prosumer and professional light compact HD camcorders, the 701HDV offers an updated design, which has been created for improved ergonomics with locks and knobs that allow for a more solid grip and better control, a better fluidity thanks to improved internal fluid cartridges, a double pan- bar rosette and a bigger sliding plate to optimize the position … |
|
|
Manfrotto 561BHDV-1 Fluid Video Monopod with Head $279.00 The 561BHDV-1 is a compact but incredibly high 4-section aluminium fluid monopod. It is equipped with a fluid head (701HDV special version) including a new long sliding plate. The ergonomic pan bar allows smooth panning and tilting movements…. |