[AR] Solid rocket insulation, yet again
- From: William Claybaugh <wclaybaugh2@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Tue, 24 Apr 2018 03:51:52 +0000
I had a nice visit w/ Kory Kline over the weekend. Whilst looking over my
two-stage hardware he noted that because extruded aluminum tubes are always
out of round, he and found that phenolic liners failed by cracking into the
inevitable gap upon ignition.
His solution to this issue was to spin cast a liner of htpb mixed w/ carbon
black and then cast a monolithic grain into that lined tube. This seems to
me clever; he suggested that it does work.
My own approach has been to straighten the tube until the bulkhead will
pass through it, end to end. This leaves a maximum of 0.010” of clearance
on the phenolic liner (which has the same OD as the bulkhead); that has not
proven to be a problem in a total of eight firings at 9” diameter.
Are there other solutions to the extruded tube out of roundness issue?
Bill
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- » [AR] Re: Solid rocket insulation, yet again- Lars Osborne
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- » [AR] Re: Solid rocket insulation, yet again- William Claybaugh
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- » [AR] Re: Solid rocket insulation, yet again- Edward Wranosky
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