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"Bastille" fins?
Hello Doctor,
I have a vocabulary question. The Centuri Sky Devil kit (see: http://www.oldrocketplans.com/centu...10/cenKB-10.pdf ) had several different fin planform options. One of the fin shapes (the one shown on the kit card, on the front of the instructions, and in the catalog illustrations) is called the "Bastille." It looks like the "trailing delta" fin type that is used on the plastic fin units of fireworks missiles. (The old "Dirty Bird III" model rocket plan used one of these fireworks missile fin units.) I'm curious as to why this fin shape is called the Bastille style. It has nothing (as far as I know) to do with the famous fortress-prison of that name that once existed in Paris. (The word means "bastion" or "castle" in English.) Calling this fin shape "Bastille" seems as odd as calling the F-104 Starfighter's trapezoidal wing planform a "Lincolnshire style" wing planform would be if it was called that. Many thanks in advance to you and/or anyone who can shed light on this!
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 09-20-2010 at 05:09 AM. Reason: This ol' hoss done forgot somethin'. |
#2
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Peculiar at best. I suppose it could have been simple artistic licence; I mean there is also the "Cobra" fin shape. Perhaps Jay can cleave into the issue?
As an ego stroke, I believe that your reference is the only one currently searchable on the entire WWW for "Bastille Fins". Well, until now.
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Gravity is a harsh mistress SAM 002 NAR 91005 "The complexity of living is eminently favored to the simplicity of not." |
#3
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Interesting pick up....
When I hear the word "Bastille", one of the first things that comes to mind is French architecture. When I think of French architecture, one of the first things that comes to mind are flying buttresses. To me, these "Bastille" fins look like the flying buttresses found on old European cathedrals. Doesn't sound too cool to call them "flying buttress fins", so.... ...intentional word/image association on the part of the designer? Later, EV |
#4
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Quote:
I think that's it. If you look up the definition of "flying buttress" you get "The flying buttress is a masonry arch extending off the outside of a building, often along the length of the nave of a cathedral, which transfers the thrust of the roof outwards and down to a pier. " Of course, if this were to be accurately applied to a rocket, the root would be up near the nose cone, and the fins would extend all the way down to the bottom of the rocket, but not much more.
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Roy nar12605 |
#5
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Quote:
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 09-20-2010 at 03:56 PM. Reason: This ol' hoss done forgot somethin'. |
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 09-20-2010 at 03:52 PM. Reason: This ol' hoss done forgot somethin'. |
#7
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I swing with the notion of a flying buttress, but why Bastille? That was a relatively typical fortress. It is interesting that GIRD used a similar fin configuration - perhaps not as elegantly curved but functional nonetheless. I have no doubt that CenturiGuy will provide a plausible answer.
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Gravity is a harsh mistress SAM 002 NAR 91005 "The complexity of living is eminently favored to the simplicity of not." |
#8
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR |
#9
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Quote:
et viola
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Gravity is a harsh mistress SAM 002 NAR 91005 "The complexity of living is eminently favored to the simplicity of not." |
#10
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__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR |
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