Re: Flat Bulkhead Tankage

Alfred Montestruc wrote:

>
> Cray74@xxxxxxxxx wrote:
>> This website...
>>
>> http://www.astronautix.com/stages/satkhead.htm
>>
>> ..mentions a "flat bulkhead" for a possible Saturn IC revision that
>> "consists of multiple conical sections."
>>
>> Does anyone have a handy (on-line) diagram of such an arrangement? I
>> think of cones as being round, like ice cream cones, and fail to see
>> how they'd be cobbled together into something that could be called
>> flat.
>
>
> A conic section is a section taken from a solid cone shape and is
> indeed flat.
>
> Imagine the ice cream cone you were discussing, now imagine it is
> solid, now imagine I have a sharp knife and cut a flat section of that
> cone at an angle that is neither perpendicular nor parrallel to the
> axis of the cone. the flat surface made by this cut is a conic
> section.

Definition:
A conic section is the intersection of a plane and a cone.

Sections parallel and perpendicular to the axis are still conic sections.

Starting with a perpendicular cut, eg a horizontal plane and a vertical
axis, we get a circle. Tilting the angle of the plane a bit, we get an
ellipse. Tilting some more, when the angle equals the angle of the cone we
get a parabola, and from there up to parallel with the axis we get a
hyperbola. When the plane is parallel to the axis, ie vertical in our
example, the section is known as a rectangular hyperbola.



The point, the line, and the pair of intersecting lines are also special
cases of conic sections produced when the plane intersects the vertex of the
cone.


--
Peter Fairbrother

.

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