I wanted to share with you some history about this Standard Catapult Design, The “Up” and Slobodan Midich. I never met Slobodan face to face, but I hope some day our paths will cross. We became “internet friends” in early 2005. During the winter months of 2005, I started trying to understand how to make indoor model gliders turn better times. I thought I might be able to make some progress if I better understood airfoils and aerodynamics. My web searching led me to a program called xfoil developed by Mark Drela, a professor at MIT. Xfoil is a free software package that can be downloaded from the MIT website (http://raphael.mit.edu/xfoil/). There is also in Yahoo groups; xfoil-Forum for exchange of ideas about xfoil (http://groups.yahoo.com/group/xfoil/) and
Indoor- Discussion of Indoor Models (http://groups.yahoo.com/group/indoor/).
Both of these groups have very interesting discussions about the subject of aerodynamics, models, airplanes, and indoor models. I joined both groups, and I was reading many of the messages sent out by members of these groups. I noticed Slobodan Midich was also a member of both groups and was very knowledgeable about Indoor models, airfoils and how to run xfoil. Since I was just learning about xfoil and had some questions, I sent Slobodan an e-mail message, and from that our friendship developed. Slobodan has taught me a lot about aerodynamics and understanding how to use and apply the information from xfoil. In this process he designed a Standard Catapult Glider, he refers to as the Up. I find this design very interesting and asked his permission to put this design on this website, with all of his work. Below are the following links to Slobodan’s work which I encourage you to read. I find this very interesting reading and hope you enjoy it as much as I have.
Plans for the Up
Plans for the Up-Bis
A Short Biography of Slobodan Midich
A Few Pictures of Slobodan Midich's Models (F1d EC 03,With F1D model, and with helper in F3J)
The Plot of the Wing Airfoil from Xfoil
The Calculated Polar Graphs of the Up Wing Xfoil
The Input Wing Airfoil Coordinates Used to Run Xfoil
The Plot of the Elevator Airfoil from Xfoil