Book of Paper Airplanes (Klutz)

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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. This bird-inspired paper airplane does more than look good, it can give you worthwhile gliding distance that more closely emulates an actual bird of prey. Functional, delicately decorative, and best of all, easy to fold; there’s no one who can’t find something to love here.

E ve lo dico, non è una storia facile da leggere. La perdita è reale e ti spezza. Sono stata fisicamente male, ho pianto. Questo libro è disperazione e dolore e pena. Ma è anche un piccolo barlume di speranza. The finished Harrier shown below. It has cool pointed wings and has great stability because of the triangle on the bottom. Erin is on vacation and in a bit of a fight with her husband when planes crash into the World Trade Center on September 11. Her husband works on the 101st floor and though it's nearly impossible he escaped, Erin cannot accept that he is dead. This book takes the reader through the stages of denial, acceptance, avoidance, grief and everything in between. Tabitha Forney wrote this with delicate hands. She took much thought into creating Erin - a grieving widow on the brink of collapse. I felt as if I was sitting right beside her, scouring the ash ridden streets of NYC in search of lost hope. I cried ugly tears right along with her. I can only imagine how difficult it was for the author to pen such raw emotions.The airfoil of the plane also affects the launch. I have tried using highly cambered airfoils optimized for slow gliding, but they tend to degrade the ascent. I wrote a computer program to reproduce the flight of the world record paper airplane to learn what parameters were most important for a long flight. One of the most important things I learned was that Cdo, zero lift wing drag, is more important in the ascent than it is in the descent. The airfoil optimized for slow gliding is not optimized for zero lift, and produces extra drag during the ascent. What is needed is an airfoil which produces low drag during slow, high lift flight, but more importantly has low drag during the ascent. I believe a nearly flat, uncambered airfoil does this. Certainly a flat airfoil is ideal for low drag at zero lift, but it can work at higher lift coefficients also. The flat wing at high lift results in a steep pressure gradient near the front of the wing on the upper surface, which likely aids transition to a turbulent boundary layer which is needed for low drag at high lift. I plan to do more airfoil tests during the spring of '97 to help find the best airfoil for long flight. It’s 2001, and Erin O’Connor’s life is going great. She is a high-powered attorney in Manhattan and is married to a man she loves dearly, Daniel O’Connor, a trader on the 101st floor of the North Tower at the World Trade Center. When her best friend invites Erin to go to Mallorca after a breakup, Erin is hesitant—she’ll miss her mother-in-law’s birthday party—but ultimately decides to go despite Daniel wanting her to stay. 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. 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

There are few technical references for paper airplanes. Naturally paper airplane books talk about paper airplane aerodynamics, but usually in a simplistic manner. There are many reference to low speed flight which are applicable to paper airplanes. Here are a few. 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. This story is incredibly moving and had me tearing up on multiple occasions. The opening scene is especially emotional as it is told from Daniel’s POV inside the North Tower. Author Tabitha Forney did an incredible job depicting Erin’s grief in the wake of tragedy and handled the subject matter of 9/11 respectfully; she has a personal connection to 9/11 that certainly shows in her writing. Erin goes from this strong woman who struggles to balance her independence and her new marriage to a woman who feels like her life means nothing. And this does mess with the pacing of the book as Erin's life continues to be left in the in-between of her husband's death, but emotion is real and so is the reality there are many Erin's out there who lost someone to soon on 9/11/01. Perhaps not an exact replica of the Star Wars Tie Fighter, this is a respectable facsimile which has the basic design of the troublesome tie, and bears the same whirlygig acrobatic action that the short-range space-to-space combatants have. Good for twists, weak on distance.What do you do when life ends…life as you know it? How do you find your way in a world forever changed? Those are the questions that Erin O’Connor faces after the death of her husband Daniel, for Daniel worked on the 101st floor of the World Trade Center and he was there at 8:46 a.m. on September 11, 2001. This is a powerfully emotive story of unimaginable tragedy, and finding purpose in a life that has had its script torn up and rewritten. Erin's journey is one that you will not soon forget. 4.5 stars We see Erin's struggle to get home in the early aftermath and her reluctance to believe that Daniel is really gone. We get glimpses of the days and weeks following the event but the story mainly follows Erin through her stages of grief, coping (not always in a healthy way) and acceptance. She swings through self destruction to finding a way to live productively despite the fact that she felt responsible for all of the decisions that led Daniel to be in the towers in the first place. Coloring books, Lego sets, and adult Nerf weaponryare jumping off the shelves–and it’s not just the fault of kids these days. These items allow grown-ups to get in touch with their inner child, and help keep their development arrested.