In spotty or choppy lift, the Apogee’s maneuverability is strikingly good. In a typical contest it is quite competitive with full size 1.5 meter HLGs. The all-laminar airfoils give good launches and surprising penetration. thin airfoils with 100% attached laminar flow at higher speeds.very light extremities and fast rudder roll response.The Apogee hand launch glider obtains thermaling performance primarily via high launch and tight circling capability. The fast control also allows safe flying in high turbulence which grounds most 2-channel 1.5m gliders. The Apogee’s fast roll rate, tight circling radius, and docile stall behavior allow very small or spotty thermals to be worked very close to the ground with confidence. This is where the small span of the Apogee really has a considerable advantage over “full-size” HLG’s - even aileron “full-house” designs. You can do some things to influence sink rate (the “hang time”) of a design, but if you can get 20% or more launch height advantage, this will swamp any minor hang time advantages.Ī perhaps even more important consideration is maneuverability. One of Mark’s early observations was that in hand launch, launch altitude is one of the most important parameters of a successful design. The Apogee HLG is the result of some careful thinking about the nature of the flight requirements of a high performance hand launched sailplane. There are several flying and in construction in the club, and we expect that once you build one, the number will multiply at a “pretty fast rate”. Comments on the Apogee, from those who have seen it fly, range from “wow” to “very surprised” to “how did he do that?”. The Apogee HLG series is the outcome of his RC HLG design analysis starting in 2000, and continuing with some recent updates. He is a well known aerodynamicist at the Massachusetts Institute of Technology, and as some of you have read on the Soaring Exchange, Mark is also working to see if he can get his XFoil airfoil design code released to the public domain by MIT. If you have experience building light wood or composite airframes, have a gram scale and are used to using it while building, like building from scratch and want to build a world class HLG, the Apogee is for you! Introductionįor some of you, Mark Drela needs no introduction… For the others, Mark has held indoor HLG records and innovated in many aspects of HLG design for the indoor crowd. In return for this effort, if built from properly chosen materials, constructed carefully and accurately, the Apogee will surprise you with its capabilities. Obtaining the Apogee’s potential requires careful construction and a constant (obsessive?) attention to weight and construction details. Unlike the Terminator, which was designed for the first-time HLG builder, the Apogee is a (very) high performance design. As such, the Terminator HLG site includes numerous construction details and a design that is fairly insensitive to design changes and construction “oopses”. You can use the thicker one at the wing root and the thinner one at the wing tip, or from the middle of the wing up to the tip.The Terminator, which was our first web-published design (designed by Bill Grenoble and Denny Maize), was an effort to bring composite construction and HLG’s to first-time builders. ![]() () - I got several requests for airfoils which are suitet for smaller ds planes (2m or 80") and a Reynoldnumber of 500.000-1.000.000. If you are interested in a substantial support for a complete DS-soarer by my person or if you have any remarks to the airfoils please. If you have build a soarer with one of these airfoils please contact me to tell me your flying impressions. If a commercial use is desired or someone needs a different design for a different task please. ![]() ![]() A commercial use is restricted by the designers copyright. The airfoils can be used by every private person. The laminar bucket is for the most of the airfoils between Cl = 0.15 and 0.6 and therefore in the most used lift regions what concerns DS. This should lead to a remarkable higher top DS-speed. The design has a much longer laminar flow than the DS-19 which is used by Brian McLean's Extreme. ![]() If you will use them for a normal F3B or F3F soarer you will be disappointed. They are thick so that it´s easier to build a rigid wing and dam fast. They start to run at a speed of 40 m/sec or more. Nov 2006) "The DP-DS-airfoils are made for extreme top speed DS-sessions (Re = 1.000.000 - 2.000.000. Drela, Delft University, DS airfoil Dirk Pflug
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