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	Science Forum Forum Index » Mechanical, Structural and Chemical Engineering  » Which Fin Design gives the best stability for a model rocket  Which Fin Design gives the best stability for a model rocket « View previous topic :: View next topic »  Author Message Xanath Posted: Sun Feb 28, 2010 6:45 pm    Post subject: Which Fin Design gives the best stability for a model rocket New Member Joined: 28 Feb 2010 Posts: 1 http://www.google.com/imgres?imgurl=http://www.grc.nasa.gov/WWW/K-12/airplane/Images/area.gif&imgrefurl=http://www.grc.nasa.gov/WWW/K-12/airplane/area.html&h=532&w=709&sz=14&tbnid=85O5V8r7pbgkhM:&tbnh=105&tbnw=140&prev=/images%3Fq%3Drocket%2Bfin%2Bdesign&hl=en&usg=__jUgW80lYP2FpHXfzXBUARv1Wbf4=&ei=V2GJS_btEoHWNO78zaYB&sa=X&oi=image_result&resnum=8&ct=image&ved=0CB0Q9QEwBw Out of those fin designs, can someone please tell me which would be the one that gives the most stability to a model rocket? Also, if possible, PLEASE list three or four of them in the order of their effectiveness. I really appreciate it, and I need this really soon. Back to top cypress Posted: Mon Mar 01, 2010 7:02 pm    Post subject: Banned (Trolling) Joined: 11 Sep 2009 Posts: 1219 Location: New Orleans For subsonic flight, the best compromise is the shape that nearly all modern airplane tails use . . . the Trapezoid. Those that deviate from this basic design will be worse generally based on the degree to which they deviate from ideal. The principle is based on the ratio of lift to drag. The highest ratio is best. Then you choose a size who's area provides the minimum required lift to maintain stability. Three fins are the minimum to provide two dimensional stability and symmetrical drag and lift forces. Four fins give lower lift to drag ratio but are easier to install and maintain symmetry. Five or more are needlessly complex. Good luck. _________________ The world is incredible Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First     Page 1 of 1 Science Forum Forum Index » Mechanical, Structural and Chemical Engineering  » Which Fin Design gives the best stability for a model rocket Jump to: Select a forum Natural Sciences----------------MathematicsPhysicsChemistryBiologyHealth & MedicineBehavior and Psychology Environmental IssuesEarth SciencesAstronomy & Cosmology  Engineering and Technology ----------------Mechanical, Structural and Chemical Engineering Electrical and Electronics Computer ScienceMilitary Technology  Social Sciences ----------------HistoryScientific Study of ReligionPhilosophy EducationPoliticsBusiness & EconomicsCriminology and Forensic Science The Science Forum----------------General DiscussionIntroductionsIn the NewsScience-Fiction and Non-FictionArt and CultureNew Hypotheses and IdeasPseudoscienceLinks Site Administration----------------Site FeedbackTrash Can  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
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