[AR] Re: DMLS Chambers WAS Re: Rocket Labs
- From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Sat, 19 Sep 2015 10:18:06 +0200
Am 18.09.2015 um 20:22 schrieb Derek Lyons:
On Fri, Sep 18, 2015 at 9:34 AM, Norman Yarvin <yarvin@xxxxxxxxxxxx> wrote:
Rockets don't need "optimum cooling", though. They just need enough
cooling to work. One isn't trying to actually maximize heat transfer,
just to have enough of it so that the chamber walls don't fail.
Quoted for truth - "the best is the enemy of good enough".
Actually good design would demand a heat barrier and behind that
the best (effective, weight, .. cooling you can design.
ineffective cooling would require to boost coolant flow
---> larger flumbing --> more weight ...
On the other hand it does not make sense to perfect one aspect
of a design in infatuation and leave others at subobtimal levels.
A good performing design is charcterized by overall upper bounds
mediocrity. i.e.
nothing sticks out below ( raises failures) and
nothing sticks out above ( much effort for minimal gain )
uwe
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