Re: Air Force Signs Off on SRB-CEV

Ed Kyle wrote:
> Total Delta 7920 Dry Mass: 19,318 kg
- snip -
> Total Delta IV Dry Mass: 28,610 kg
>
> So a Delta IV Light would have about 1.5 times
> more dry mass (about 9.3 tonnes (20,500 lbs)
> more metal, fiberglass, etc.) than a Delta 7920,
> but it would only provide about 1.2 times more
> payload lifting ability. In 1998, Michael
> Griffin said that a launch vehicle's production
> cost is roughly equal to $1,000 per pound of dry
> mass. If true, a Delta IV Light would cost about
> $20.5 million more to build than a Delta 7920.

Ed, if dry mass is the sole determinant of launch vehicle cost, what
explains the 50% increase in per-flight cost that the EELV program is
seeing? Did they add tons of lead ballast to every Atlas V that comes
off the line?

And why do you persist in trying to evaluate higher-order effects using
a model that deliberately ignores them? Do you really consider this to
be a valid reasoning technique?

-jake

.

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