Vena Contracta 'template'

[aerohead]

After a dose of BAYER HEROIN (R), I revisited the fluid mechanics text and was captured by an image of the famous 'vena contracta' entry loss, for a submerged, flush, straight-edged, pipe inlet feeding off a larger reservoir.
As the water enters the inlet, it forms a Prandtl surface of discontinuity, swept, rotationally into a streamlined torroidal ring of dead water, in the form of a perfect venturi, as you'd find looking down any barrel of a HOLLEY Dual-Feed, Carter AFB, or Rochester Quadrajet carburetor.
In 'side' profile, the forebody constitutes 39.3% of its length, with 60.7% aft-body, Length / height = 6.13, and maximum rear slope angle of 21.2-degrees, before reflection, blending onto the pipe wall.
Nature working it's magic.

[freebeard]

I looked for a word count feature in two word processors then gave up and counted by hand, so approximately 113 words.

113/1000 multiplied by 100 equals 11.3% of one picture.

What happens if it's a twisted pipe? Viktor Schauberger: Austrian Patents (Vortex Control of Water Flow)

English Translations/Transcriptions:

Austrian Patent # 113,487: Construction for Creating Wild Brooks & Flow Regulation

Austrian Patent # 122,144: Artificial Channel for Transporting Logs

Austrian Patent # 134,543: Conduction of Water in Tubes & Channels

Austrian Patent # 136,214: Installation & Correction of Flow in Draining Channels...

Austrian Patent # 138,296: Water Conduction

Austrian Patent # 142,032: Construction for Fabricating Tap Water...

Austrian Patent # 166,644: Plow

Austrian Patent # 196,680: Tubing for Flowing & Gaseous Media

Austrian Patent # 117,749: Jet Turbine

French Patent # 1,057,576: Processes and Equipment for the Conveyance of Liquid, Gaseous or Aeriform Media Processes [ &c ]...

Austrian Patent # 145,141: Air Turbine

British Patent # 1,187,632: Apparatus for Agitating Body of Fluid

US Patent # 1,775,871: Apparatus & Method for Sorting Wood

[freebeard]

Well, I can't find a better thread so what do you think about the aerodynamics this?


bigcommerce.com: Fishing Spear Accessory for the Can Cannon

This is a dart for fishing. Arrowhead not included. In theory the plate acts like the fletching on an arrow. I have no idea how the tip is centered in the bore. Using it to fish from a boat would involve refraction of the sight line, but then don't AR-15s work under water.

[Piotrsko]

Kalashnikov's do.

I suspect it's a friction fit in the barrel so loaded centered would continue centered because of the pressure firing it.

[aerohead]

Originally Posted by freebeard

I looked for a word count feature in two word processors then gave up and counted by hand, so approximately 113 words.

113/1000 multiplied by 100 equals 11.3% of one picture.

What happens if it's a twisted pipe? Viktor Schauberger: Austrian Patents (Vortex Control of Water Flow)

I'd rather not think about it, considering all that's on my table.

[aerohead]

Originally Posted by freebeard

Well, I can't find a better thread so what do you think about the aerodynamics this?


bigcommerce.com: Fishing Spear Accessory for the Can Cannon

This is a dart for fishing. Arrowhead not included. In theory the plate acts like the fletching on an arrow. I have no idea how the tip is centered in the bore. Using it to fish from a boat would involve refraction of the sight line, but then don't AR-15s work under water.

I don't want to think about it. Maybe it's own thread?