[AR] Re: Above 65000 ft for free
- From: Peter Fairbrother <zenadsl6186@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 4 Sep 2018 02:13:15 +0100
On 03/09/18 12:57, John Dom wrote:
https://www.youtube.com/watch?time_continue=48&v=QFMmkUacW_s
Propellant mass required = zero J
I imagine takeoff took a few ..
John
"The older you feel
the less that you need
the higher you fly"
WOT?
On a personal note, getting older, up for bionic knee also. Just
retired, waiting on pension and house sale / purchase - but then, whoopee!
Decided to build actual rockets for a while, rather than focussing
perhaps too closely on high-temperature-and-pressure-oxygen compatible
alloys, and the technologies to build them into efficient
high-temperature turbine blisks for teeny-tiny LOX-rich
staged-combustion engines. More of that later, but for now:
So: 1st rocket. LOX/kero, 400N turbopumped engine (of course), 60 psi
tank/inlet. About 10kg wet mass. Target 2kg dry? Perhaps too ambitious?
Can get 4" x 1.5mm wall 6082 aluminium tubing for real cheap. 4"
diameter rocket means ~14 fineness ratio. Wall is too thick, means 3+kg
dry. OK, it's just for practice and fun, something easy to begin with.
Need to spin tank ends, a skill I do not have - hopefully it won't be
too difficult to learn. TIG weld ends to tanks, yay.
Weld filler? I will solution treat and age the finished structure
(though in this over-strength case it probably doesn't need it), turns
out in that case plain old 4043 is best, as the weld metal is as strong
as the base metal when it's that thin, which 5556 isn't quite up to.
Which tank goes on top, LOX or kero? Does the duct from the top tank go
through the bottom tank, or outside it? Design decisions which have been
made and remade before now. Is it ok/sensible to run detcord
through/along the duct for range safety purposes?
And now for the hard stuff:
UK launch site. Perhaps over Karman line - any suggestions?
UK launch rail. Can anyone lend me one? Next summer sometime, if all
goes well. I don't want to try thrust direction control just yet, so
fins: and with a slowish start, the longer the launch rail, the better.
--Peter
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