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Written by Kevin Sharbonda
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http://www.rcgroups.com/forums/showpost.php?p=7940545&postcount=11 Re: Launch, CG and Elevator -------------------------------------------------------------------------------- Analysing Martin Weberschock's Launch setup. A theory by Marcus Stent This is basically my opinion on how Martin Weberschocks sets up the Launch Mode of his F3B glider. This was deduced by listening to his lecture in 2000 and applying my learnings from the XFoil program (Profili 2). Please feel free to make comment on my observations… Step 1. The towhook for Launch Mode is not dependent on where the C.G. is, but rather where the Aerodynamic Centre of the model is located. This is because during launch we add an external force to the model (the winch) which adds probably 50Kg of force to the Model. This force needs to balanced with the Lift force of the Wing, so we get a smooth launch, and this Lift force is generated at the Aerodynamic Centre of the model. The fact that there is a 2Kg model stuck in between these two huge forces is just about irrelevant, and weather the 2Kg mass is 5mm forward or back is going to have even les effect.. |
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Written by Web Master
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The Baltimore Area Soaring Society is an AMA sanctioned Club of approximately 60 members, formed in 1980 to enjoy the pleasure of silent R/C flight. BASS is sanctioned by the Academy of Model Aeronautics and is recognized by AMA as a Gold Leader Club. Almost all areas of silent flight are pursued within the Baltimore Area Soaring Society. Our members participate Thermal Soaring, Slope, Hand Launch and electric powered R/C. Our main purpose is to promote friendship among modelers and a better understanding of the construction and successful operation of R/C sailplanes and electric aircraft. Members enjoy the use of BASS supplied equipment specific to thermal soaring. BASS maintains both contest and sport winches, retrievers, winch batteries, battery chargers, retriever pole, frequency pins and related supplies. In addition to this equipment, BASS even provides a "Club Trainer" to allow newcomers to experience the thrill of soaring. Members also receive the club newsletter, BASS News. This is published 11 times a year and truly is the "Information Provider to the Glider Guider". |
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Written by Frank Weston
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A topic of great interest on the internet, and in various soaring newsgroups is the dive test. Mostly there has been a lot of confused discussion, with more verbiage than knowledge exchanged. Here for you newsletter readers is our attempt at a simple, straightforward discussion. First, some plain English definitions. |
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