[AR] Re: fatigue life (was Re: Re: SpaceX F9 Launch/Update...)
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Wed, 30 Dec 2015 19:23:54 -0500 (EST)
On Wed, 30 Dec 2015, Brian Feeney wrote:
Does the Saddle / Jacket engine design alleviate much of the inner to
outer differential thermal wall stress by way of the inner wall (chamber
/ nozzle) sliding relative to the outer wall.
XCOR's patented (US# 7854395 B1) design lets the inner wall expand both
axially (by sliding within the jacket) and radially (by building the
jacket as a loose fit at room temperature, so it's only a snug fit -- not
a crushing constraint -- with the inner wall hot). In principle this
could avoid much of the problem. In practice the details probably matter
a lot...
Henry
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