Book of Paper Airplanes (Klutz)

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Getting a tight spiral with a football is something that many people, like Mark Sanchez, have failed to get right. Putting the perfect spin on a paper plane is something almost no one can do, unless they have the secret ingredient. A little practice is all it takes to get a rifled spin time and again with this little dervish.

First, fold the top left corner all the way down so it meets the right edge of the paper. You’ll then unfold, as this will be a guiding crease.

M.M. O'Meara and T.J.Mueller, "Experimental Determination of the Laminar Separation Bubble Characteristics of an Airfoil at Low Reynolds Numbers", AIAA-86-1065, May 1986

Real airplanes have to be optimized to perform some mission. Since its tough to beat the basic wing/fuselage/tail configuration for aerodynamic efficiency, most planes look that way. The mission of a paper airplane is to provide a good time for the pilot. Sometimes that means the amazement of seeing something radical fly through the air. The combinations of wings, tails, fuselages, and other parts that can be made to fly is endless. Beyond the traditional paper airplane designs there are many exotic shapes that don't look like they should fly. One of these is the "hoop shape", known as the Vortex in my original book. Another exotic shape is in my 1997 calendar called the X-Plane. It is basically two wings attached in the middle and at different angles to form an "X" shape. Other more familiar shapes, but not thought of as airplanes, can also be made to fly. One of these is the Starship from my 1997 calendar, which looks like a futuristic space craft , but it actually flies. With paper airplanes its easy to make airplanes that don't look like real airplanes. Substituting the minimum sink results into the power equation, and knowing that vertical velocity is power/weight, gives the following: Families, relationships, possessions are all sharp nails driven into the fabric of life, pinning you down. When they're ripped away, it gives you freedom but leaves you in tatters."Sharp and fast, The Concorde isn’t going to necessarily win many distance competitions, since it’s so streamlined, but it’s a nasty dogfighter that will take down any bogies that head into your airspace. Cut hard and accurate, it’ll rip holes in those ceiling snowflakes that Betty from HR keeps hanging up around the holidays. Over dinner she tells Daniel she is leaving the next day for Spain. They disagree. He doesn't want her to go and she doesn't want to stay. The next day they hardly speak, he heads to work. Just as she's getting in a cab to leave for the airport Daniel arrives to kiss her cheek goodbye and she's off. Low aspect ratio wings are easier to fold. One of the reasons we make paper airplanes is because they are fast and easy to build (gee, is that two reasons?). As mentioned in section 2.2, where a paper airplane balances is called the Center of Gravity (CG), and there is a specific CG position known as the Neutral Point which provides neutral pitch stability. If the airplane has a CG ahead of this point, the plane is stable, if its behind this point its unstable. Naturally all airplanes without computer assisted flight controls need a CG ahead of their neutral point. For rectangular wings the neutral point is ¼ of the distance from the nose to the tail. For delta wings (such as the common dart paper airplane) the neutral point is ½ of the distance from the nose to the tail. Many thanks to Netgalley and She Writes Press for sharing a free copy with me in exchange for a honest review. All opinions are my own.]

A number was devised which gives the relative importance of viscosity in fluid flow. It is called the Reynolds Number, and it is the ratio of momentum forces to viscous forces in a fluid. The bigger the number, the less influential the viscosity. The viscosity is essentially a constant for a fluid (it changes a bit with temperature), but momentum is proportional to the speed of a fluid over a surface times the distance it has traveled over the surface. For air it is roughly: Erin has everything. Friends, a good job, she is married to Daniel, the love of her life, and they live in New York where they are building their future. I'm not gonna lie, this story is brutal. It basically ripped my heart out and left me a bit of a sobbing mess by the time I finished it. It is so beautifully written and the way Erin struggles with her guilt and grief during the ten years following 9/11 is told with such realistic and raw emotion. At times this makes this book very difficult to read, but at the same time that's what makes it so compelling and real. I also loved how the author showcased that grief isn't linear, nor is it the same for everyone. And even though people around you expect you to move on, if you yourself aren't ready, it will not end well. Erin's story is definitely one I will not soon forget. would honestly recommend this book to everyone. Tabitha dedicates this book to all the victims of 9/11, and those they left behind. May we never forget. Erin is drinking margaritas on a beach in Mallorca, helping her best friend get over a breakup, when she hears a plane has crashed into Daniel’s building. On a television at the smoky hotel bar, she watches his building collapse. She makes her way home with the help of a stranger named Alec, and once there, she haunts Ground Zero, nearby hospitals, and trauma centers, plastering walls and fences with missing-person flyers. But there’s no trace of Daniel.Auto folder:Look at all those paper airplanes! Wouldn’t it be great if there was a machine that can fold the paper airplanes for you? Well there is. In 2008, Balkcom & Mason invented the first origami-folding robot. Watch video or read article. This machine could fold a paper airplane, a samurai helmet, and a paper cup. This wasn't going to be easy. If successful, it would be my forth time at setting the record. Each time was the absolute I could achieve, with improvements resulting from improving my planes and from working on a faster throw. My best unofficial time, 20.88 seconds, was the product of months of working out and well over 100 airplanes constructed. And I have another enemy sneaking up on me as well - time. I am 35 years old, and soon I know my arm speed is likely to decrease. By comparison the wings of a four passenger airplane have a Reynolds Numbers of up to about 6,000,000. Also, remember the transition from laminar to turbulent? That happens at a Reynolds number of no less than about 10,000, so the first ½ to ¼ of the flow over a paper airplane's wing is laminar. Since the Reynolds Number is much less than for full sized airplanes, this means viscosity is much more dominant, resulting in more drag, and more difficulty in creating lift. This paper airplane is a warm-up of sorts. It’s simple, requires few folds, and flies well. It’s just not going to win you any contests or style points. If it’s your kid’s first time making a real paper airplane, this is a good place to start. This was a difficult novel to read because the feelings of Erin are so realistically raw. The author really gets you into Erin’s thoughts and includes some utterly heartbreaking scenes such as when Erin lays on the sidewalk near Ground Zero, wanting to be near the dust of her husband. It’s because you care for Erin that it becomes difficult when she takes some major risks including drinking, using drugs and squandering the 9/11 Victim settlement she gets. I have read a lot of grief novels, but that doesn’t make Erin’s struggles any more poignant. This was a well written book. Four and a half stars.