uncleflo
Registered since September 28th, 2017
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MIT OCW - 2.972 How a Hydrofoil Works
Saved by uncleflo on February 12th, 2022.
The rquirement is to lift the boat's hull outside the water. Hydrofoil (It is a foil or wing under water used to lift the boat's hull until it is totally outside the water.) Explanation: 1. At low speeds the hull (body of ship) sits in the water and the hydrofoils are totally submerged in the water. 2. As the boat's speed increases, the hydrofoils create lift. 3. At a certain speed, the lift produced by the hydrofoils equals the sum of of the boat and cargo weights. Therefore the hull comes out of the water. 4. Instead of having an increase in drag with increasing speed because the hull is lifted out of the water (contrary to what happens in traditional boats due to pressure drag), the hydrofoils provide a more efficient way of cruising. Decreasing the drag contributes to the better use of the power needed for the movement of the boat.
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Why are modern 50mm lenses so damned complicated?: Digital Photography Review
Saved by uncleflo on May 11th, 2021.
Back in the days when men were iron and ships were wood, there were some things you could rely on. One of those things was your wide-aperture prime lens was a relatively simple double-guass design. Pre-1900, lens designers had already created five of the six lens types that are the basis of what we use today. (The retrofocus lens didn't come around until the 1920s, and zoom lenses, for those who are curious, are basically modified Cooke triplets.) The double gauss has been THE predominant design for wide aperture primes since the late 1800s. Over the years, designers have added additional groups to bring in more light, correct aberrations, and generally make a better lens. But the double gauss part was there in the center of the lens diagram for wide-aperture prime lenses right up until modern times. Name a famous prime lens and it was probably a double gauss: Speed Panchro, Planar, Xenon, Summicron, Takumar, Ultron, and on and on.
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SailboatData.com - SNAPDRAGON 26 Sailboat
Saved by uncleflo on May 24th, 2019.
Sailboat Rigging Diagram. Founded by Ray Walsh and Len Wakefield as Thames Structural Plastics, originally to build fiberglass components for a number of industries. The emphasis turned to the manufacture of boats early on. The first sailing yacht was the 23' SNAPDRAGON (1962). Expansion came in a number of stages and the company started to build it's own factory at Canvey Island, Essex. (1965) As TSP Ltd., the company began doing the moldings for other boat builders; Thames Marine became the name for selling their own models. There was also a branch that built power boats and another to build the Prout line of catamarans. No longer in business.
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Ergonomics and car seat design with diagrams (Asian Language)
Saved by uncleflo on November 29th, 2018.
An article about the seat and cockpit design of a car, all written in an Asian Language. The Diagrams are very useful for making chairs.
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GoJS - Interactive JavaScript Diagrams in HTML
Saved by uncleflo on May 19th, 2018.
GoJS is a feature-rich JavaScript library for implementing custom interactive diagrams and complex visualizations across modern web browsers and platforms. GoJS makes constructing JavaScript diagrams of complex nodes, links, and groups easy with customizable templates and layouts. GoJS offers many advanced features for user interactivity such as drag-and-drop, copy-and-paste, in-place text editing, tooltips, context menus, automatic layouts, templates, data binding and models, transactional state and undo management, palettes, overviews, event handlers, commands, and an extensible tool system for custom operations. GoJS is pure JavaScript, so users get interactivity without requiring round-trips to servers and without plugins. GoJS normally runs completely in the browser, rendering to an HTML5 Canvas element or SVG without any server-side requirements. GoJS does not depend on any JavaScript libraries or frameworks, so it should work with any HTML or JavaScript framework or with no framework at all. Build custom modeling environments and domain-specific visual languages using the powerful features of GoJS. Provide both a system editor and a read-only status monitor using shared code and templates. Simultaneously show alternative visualizations of the same data in different diagrams. Implement drill-down using expansion of subtrees and subgraphs or a detailed view in another diagram. Yet GoJS is remarkably simple for such a powerful and flexible system. Our thorough documentation introduces the basic concepts and demonstrate typical features that most apps want to offer. Nodes and links can be arbitrarily detailed according to the needs of the application. The API consists of only a few dozen important classes which encapsulate many useful features that interact with each other. There are many properties that permit simple customizations; some methods may be overridden for more complicated customizations.
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SequenceDiagram.org
Saved by uncleflo on May 15th, 2017.
SequenceDiagram.org is a completely free online tool for creating sequence diagrams. The graphic design is created by yusi.se. All processing of parsing and painting the diagram is done using javascript client side in the user's web browser. This not only makes it snappy to work with, but it also means that your secrets are safe. Since no backend server is used it is also possible to use the web application offline. There are many sequence diagram tools out there but this is the only one which allows you to: Script using a simple text notation when it is most convenient to do so, and Interact using your mouse to draw and change arrows or create notes when that is most convenient In other words bringing the best from both worlds. This makes it very easy to work with large diagram where other similar tools struggle. It also doesn't have any ads or unnecessary istracting elements. (Even the top bar can be hidden to maximize the working area). The source script of the diagrams can be save as text files directly to your hard drive or in the browsers local storage. There are also single click buttons to save the diagram in HQ png or LQ jpeg format. The size of the image depends on the current zoom level. If you want to share a diagram with others there is a URL share button available. It creates a link containing all the data of the diagram and can be sent to others so that they can view your diagram or keep working where you left off. The tool is developed and maintained by people who create a lot of sequence diagrams in their daily work and from efficiency point of view weren't 100% satisfied with the existing tools.
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GoJS® Diagramming Components for HTML5/Canvas, by Northwoods Software®
Saved by uncleflo on November 14th, 2014.
GoJS is a feature-rich JavaScript library for implementing interactive diagrams across modern browsers and platforms. GoJS makes constructing diagrams of complex Nodes, Links, and Groups easy with customizable templates and layouts. GoJS offers many advanced features for user interactivity such as drag-and-drop, copy-and-paste, transactional state and undo management, palettes, overviews, data-bound models, event handlers, and an extensible tool system for custom operations. GoJS is pure JavaScript and it does not depend on any JavaScript libraries or frameworks. Users get interactivity without requiring round-trips to servers and without plugins such as Flash or Silverlight.
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Brushless DC (BLDC) motor with Arduino – Part 2. Circuit and Software
Saved by uncleflo on July 15th, 2014.
In this post I will describe the hardware and the software part of a project involving the use of BLDC (Brushless DC) motor salvaged from a broken XBox 360. This is a second installment in the series of posts related to Arduino and brushless DC motors. Please see the first part for a bit of info on the theory behind the commutation sequence. Once you understand the commutation sequence for the particular design of the BLDC motor, the circuit design for the BLDC driver becomes pretty clear. It is not much different from a bipolar stepper driver in that we need the be able to both source and sink current at all ends of the windings, except of course in this case there are only three ends whereas the bipolar stepper has four.
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3 Normal Forms Database Tutorial
Saved by uncleflo on March 21st, 2013.
This is meant to be a brief tutorial aimed at beginners who want to get a conceptual grasp on the database normalization process. I find it difficult to visualize these concepts using words alone, so I shall rely as much as possible upon pictures and diagrams. To demonstrate the main principles involved, we will take the classic example of an Invoice and level it to the Third Normal Form. We will also construct an Entity Relationship Diagram (ERD) of the database as we go.
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UaShem.com | Video and TV | Video Clock and Message Generator
Saved by uncleflo on May 20th, 2009.
I was searching for device to generate video clock signals recently when I stumbled onto this circuit from David L. Jones of Tronnort Technology in Sydney Australia.David has a very impressive set of designs available at http://www.ozemail.com.au/~dljones/projects.htm.
This circuit allows you to superimpose a title and/or the time and sate on an incoming video signal - very useful when editing video tapes. It's also a good introduction to video signals and processing. The text that follows is from David's article
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