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Ogive Nose Cones
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"Ogive Nose Cones
The ogive nose cone is probably one of the most common
shapes used in model rocketry. It exhibits very good drag characteristics for
general model rocketry use. If you are building a scale Tomahawk, Sandhawk, or
Phoenix, then you will be dealing with an ogive. Ogives are classified by
their "caliber”, or length to diameter ratio. Thus a nose that is one
inch diameter and three inches long is a “3-to-1” (3:1) ogive and has a caliber
of 3.
Once, while trying to build a Nike-Tomahawk, I tried to find
the formula to draw a 3:1 ogive so that I could turn the cone on a lathe. I
looked though Pete Alway’s The Art of Scale Model Rocketry ,
engineering and math textbooks, the CRC math handbook, old rocketry magazines,
and the Internet. I could not find the formulas.
I decided to derive the equations myself. Step 1: What the
heck is an ogive anyway? Webster’s Ninth Collegiate Dictionary
defines “ogive” as “\‘oh-,jiv\ n 1. a: a diagonal arch or rib across a Gothic
vault b: a pointed arch 2: a graph each of whose ordinates represents the sum
of all the frequencies up to and including a corresponding frequency in a
frequency distribution”.
That didn't help much! Searching math and statistics sites turned up an explanation of the term "ogive" which can be found here at MathWorld , or here . They weren't much help in figuring out what an ogive nose cone is.
Further sea"
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