uncleflo

Compressor Filter System Theory - Scuba Engineer

https://scubaengineer.com/high_pressure_compressor_filtrat.htm

Saved by uncleflo on June 13th, 2022.

Many homes and small workshops have single stage compressors capable of producing 7bar/100psi pressure for powering hand tools and filling truck tires. These simple compressors use the most basic engineering techniques and are successfully mass produced out in the Far East as a low cost consumer product. It comes as quite a surprise when a dive operation comes to purchase their first high pressure divers breathing air compressor to be met with a price tag approaching that of a family car, and the use of which is surrounded by a pile of legal regulations and maintenance obligations, and competent operator requirements which if not met, will cause several well known phenomena.

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How a Sail Gives Lift

http://www.gentrysailing.com/pdf-theory/How-a-Sail-Gives-Lift.pdf

Saved by uncleflo on April 10th, 2021.

How many times have you heard that a sail gives lift to drive a boat because, "the air travels faster on the lee side for it has farther to go than it does on the windward side. So the pressures are different and you get lift." Well, that is wrong! Even a perfectly flat thin airfoil, with the same distance on both sides, has lift when it is at an angle to the wind.

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Arvel Gentry | North Sails

https://www.northsails.com/sailing/en/art-science-sails/gentry

Saved by uncleflo on April 10th, 2021.

In the first edition of the Art and Science of Sails, written by Tom Whidden, president of North Sails Group, LLC, and Michael Levitt, and published by St. Martin’s Press, the authors used Arvel Gentry’s now famous Bathtub Experiment to demonstrate the existence of Circulation, or a second force, that operates around an airfoil, like a sail, wing, or keel etc. Big picture: it’s the combined effort of these two forces that makes the wind speed up on the leeward side — and thus show low pressure — and slow down on the windward side of a sail — high pressure. Gentry was the Boeing engineer who first taught sailors aerodynamics. These diagrams first appeared in Gentry’s Sail magazine articles. In the Revised Edition, the authors used computer testing to show where the wind speeds up around a sail plan and where it slows down. And why and by how much? Nevertheless, Gentry’s experiment is the standard — still popular on the web — and it was left it out of the Revised Edition with trepidation, but we linked in the book to this web page.

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An Introduction to the Physics of Sailing | MIT BLOSSOMS

https://blossoms.mit.edu/videos/lessons/introduction_physics_sailing

Saved by uncleflo on January 20th, 2021.

The goal of this lesson is to explain how sailboats work by exploring basic physics principles. At the end of this lesson, students will be able to identify the forces acting on a sailboat and explain how the combination of these forces results in the forward motion of a sailboat. Students should be familiar with vectors and be able to use them to represent forces and moments, and also should be familiar with using free body diagrams to represent forces and moments. A basic understanding of fluid flow and/or resistance might be helpful, but not necessary. This lesson and the follow-on assessment will each take about one hour to complete. Students only need pen/pencil and paper to complete the activities in the lesson, although an optional activity where students make their own sailboats would require additional materials. The classroom activity challenges are centered around small-group discussions based on the questions posed before each break. Free body diagrams, or another conceptual representation of his or her answer, should support each student’s solution to the questions posed in the video. Instructions for the option of having students design their own sailboats as part of this lesson can be found here: https://tryengineering.org/teacher/sail-away/

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Surfboard Hull Design

http://www.minisimmonssurfboards.com/surfboard-hull-design/

Saved by uncleflo on September 14th, 2018.

I have been wondering about this a lot in Mini Simmons surfboard design (surfboard design in general)—what is a hull and how does it influence the board and the ride? Two factors are at work when a planing surfboard is in motion: the propulsion power, or force, that creates forward motion (the wave energy); the resistance that opposes it (your fat ass standing on the board). When at rest, a surfers weight is borne entirely by the buoyant force (also depending on how much beer you drank the night before). At low speeds every hull acts as a displacement hull, meaning that the buoyant force is mainly responsible for supporting the surfer. As speed increases, hydrodynamic lift increases as well. Ok, you got to reach back to some physics for this one.

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Google’s Quantum Dream Machine

https://www.technologyreview.com/s/544421/googles-quantum-dream-machine/

Saved by uncleflo on September 8th, 2016.

Physicist John Martinis could deliver one of the holy grails of computing to Google—a machine that dramatically speeds up today’s applications and makes new ones possible.

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IBM Shows Off a Quantum Computing Chip

https://www.technologyreview.com/s/537041/ibm-shows-off-a-quantum-computing-chip/

Saved by uncleflo on September 8th, 2016.

A superconducting chip developed at IBM demonstrates an important step needed for the creation of computer processors that crunch numbers by exploiting the weirdness of quantum physics. If successfully developed, quantum computers could effectively take shortcuts through many calculations that are difficult for today’s computers.

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Shock Mitigation in Low-Density Thermoplastic Foams Part I – Dealing with Inbound Kinetic Energy

http://www.foamandform.com/technical-minutes/shock-mitigation-in-low-density-thermoplastic-foams-part-i-dealing-with-inbound-kinetic-energy

Saved by uncleflo on December 7th, 2014.

Low-density thermoplastic foams are frequently used as energy-absorbing foams. That is, kinetic energy from an incoming mass is mostly dissipated in the foam, resulting in little, if any, throwback or reverse propulsion of the mass from the foam. Typically, energy absorption is described in terms of the area under the foam stress-strain curve. The typical stress-strain curve for a low-density foam is depicted as having three general components: At low compression, say, less than about 5%, the foam acts as a Hookean elastic spring. That is, the extent of compression, ε, is directly proportional to the applied stress, σ , with the proportionality, Ef, being the modulus of the foam: σ = Ef ε. For essentially all foams, the modulus of the foam is directly related to the modulus of the polymer, Ep, and the ratio of squares of the foam density, Ep, and polymer density, ρP: Ef = Ep (ρf / ρo)².

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Ray / Triangle intersection code - Math and Physics - GameDev.net

http://www.gamedev.net/topic/447861-ray--triangle-intersection-code/

Saved by uncleflo on December 7th, 2014.

Hallo, Im working on the collision detection part of my program and have it partially working. Right now it works in some cases, but fails in other A triangle made like this works.

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Nozzle Design

http://exploration.grc.nasa.gov/education/rocket/nozzle.html

Saved by uncleflo on September 2nd, 2014.

A rocket engine uses a nozzle to accelerate hot exhaust to produce thrust as described by Newton's third law of motion. The amount of thrust produced by the engine depends on the mass flow rate through the engine, the exit velocity of the flow, and the pressure at the exit of the engine. The value of these three flow variables are all determined by the rocket nozzle design.

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Reaction Engines Ltd : Space Propulsion Systems

http://www.reactionengines.co.uk/

Saved by uncleflo on May 30th, 2014.

Driven by an extensive and pioneering technology programme, Reaction Engines Ltd has made a breakthrough in aerospace technology that is now allowing the development of engines that will propel aircraft at speeds of up to five times the speed of sound or directly into Earth orbit.

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LF Special Report: 10 Futuristic Materials

http://lifeboat.com/ex/10.futuristic.materials

Saved by uncleflo on May 29th, 2014.

10 Futuristic Materials by Lifeboat Foundation Scientific Advisory Board member Michael Anissimov.

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True, Reactive, and Apparent power : Power Factor

http://www.allaboutcircuits.com/vol_2/chpt_11/2.html

Saved by uncleflo on February 23rd, 2014.

We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. This “phantom power” is called reactive power, and it is measured in a unit called Volt-Amps-Reactive (VAR), rather than watts. The mathematical symbol for reactive power is (unfortunately) the capital letter Q. The actual amount of power being used, or dissipated, in a circuit is called true power, and it is measured in watts (symbolized by the capital letter P, as always). The combination of reactive power and true power is called apparent power, and it is the product of a circuit's voltage and current, without reference to phase angle. Apparent power is measured in the unit of Volt-Amps (VA) and is symbolized by the capital letter S.

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122R-02 Guide to Thermal Properties of Concrete and Masonry Systems - 122R_02.PDF

http://www.bpesol.com/bachphuong/media/images/book/122R_02.PDF

Saved by uncleflo on February 8th, 2014.

This guide reports data on the thermal properties of concrete and masonry constituents, masonry units, and systems of materials and products that form building components. This guide includes consideration of thermal mass of concrete and masonry, passive solar design, and procedures to limit condensation within assemblages.

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Open Data - University of Southampton

http://data.southampton.ac.uk/vacancy/251313FP.html

Saved by uncleflo on July 4th, 2013.

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Open Data - University of Southampton

http://data.southampton.ac.uk/vacancy/251413FP.html

Saved by uncleflo on July 4th, 2013.

This page shows raw data about this resource. We have not yet had the time to build a pretty viewer for this type of item. Don't worry if it seems a bit arcane -- you are looking under the hood of our service into the data inside!

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BoxCar2D

http://boxcar2d.com/

Saved by uncleflo on February 27th, 2012.

Each car is a set of 8 randomly chosen vectors: direction and magnitude. All the vectors radiate from a central point (0,0) and are connected with triangles. For each wheel it randomly chooses a vertex to put the axle on, and picks an axle angle from 0 to 2 pi. If it chooses -1 for the vertex that wheel is turned off. There is nothing to prevent multiple wheels from being on the same vertex. Users: So very insightful and deeply thought provoking. You must be a genius.; Really hypnotic and fun to watch!; 71 generations and I'm stuck at 923 for the last 50 generations. Bug in program :( ->That's not a bug. It's a local maxima. No change to 5% if its DNA will result in a higher score, so it stays there. Increase the mutation rate, and (eventually) it will climb. Though it will go through a whole lot of shitty generations first. It's a problem inherent with all simple genetic algorithms.

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Example: Solving a first order ODE by Laplace transforms

http://autarkaw.wordpress.com/2011/02/03/example-solving-a-first-order-ode-by-laplace-transforms/

Saved by uncleflo on October 31st, 2011.

I have a audiovisual digital lecture on YouTube that shows the use of Euler’s method to solve a first order ordinary differential equation (ODE). To show the accuracy of Euler’s method, I compare the approximate answer to the exact answer. A YouTube viewer asked me: How did I get the exact answer? In this blog, I use the Laplace transform technique to find the exact answer to the ODE. In a previous blog, I showed how to find the exact answer to the ODE by the classicial solution technique.

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