[SS-VehDev] NC Matrix

[william colburn]

I agree and after sending out the first matrix without
further explanation, I knew it would not be received
well.

The NC matrix was created to choose a concept for
construction with a great deal of knowledge and
background in NC construction.

Not needed were specific values for impact pressure,
stagnation temperature, etc.

What it showed, I believe, was that no single
construction method was outstanding of itself.

The matrix for the case, for instance, will have
Density, Tensile strength, additional processes like
heat treat-plating-autoclaving,materials cost per
case, weight per case, and the items currently on the
matrix.

One method of determining the material and mode of
construction is by legacy alone. This was used on the
Space Shuttle. It created a number of problems. A way
to protect the aluminum structure from intense
re-entry thermal effects was one. They added the tiles
to alleviate that problem. It worked, mostly.

So we could easily say at the outset what material and
construction technique we were to use and then solve
peripheral problems as they come up.

I believe it is better to make a sound system that
requires little or no additions for its primary
function, and little or no additions for secondary and
tertiary functions. 

Awaiting some further analyses so we can incorporate
those results into further matrices.

BC


> I think the basic idea of the matrix has merit,
> however, I think we're still
> way too premature regarding things like possible
> construction techniques,
> material selection, etc.
> 
> Let's complete the first-order approximations to
> determine a starting point,
> then complete loads and thermal analysis (which most
> likely will be some
> sort of iterative process that will be tied into
> aerodynamic configuration),
> and finally tackle materials and fabrication
> methods.
> 
> My 2 pence.
> 
> Cheers-
> Dave
> 
> 
> -----Original Message-----
> From: william colburn
> [mailto:space1space at sbcglobal.net] 
> Sent: Thursday, September 08, 2005 7:45 PM
> To: ss-vehdev at sugarshot.org
> Subject: [SS-VehDev] NC Matrix
> 
> The matrix gives about the same score for all
> candidates. Since it is probably about +/- .5 or so,
> the values are really the same.
> 
> I am rather in favor of Andrej's composite-over-
> honeycomb version. It comes out about even with the
> others and even better if he uses carbon composite
> too.
> 
> The idea of adding the attachment points for
> instruments and hardware as nutserts is appealing
> too.
> 
> The Titanium is the high tech version and would be
> free to us. It suffers from needing insulation for
> the
> inner workings.
> 
> Comments?
> 
> BC
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