Hell, I'd say go for it and get the journals.  If I could afford to do
the same for IEEE and AIAA (my roommate gets AIAA, I get IEEE), I'd
definitely go for it.  You never know when that stuff could come in
handy.  I have a bunch of declassified documents from my summer spent at
Wright Patterson Air Force Base if anyone is interested in copies of
them.  

Gabriel 

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of John Carmack
Sent: Tuesday, June 11, 2002 4:22 AM
To: [EMAIL PROTECTED]
Subject: [ERPS] ISAS paper

I finally got around to joining AIAA, and while browsing around the
site, I 
noticed that they have a free sample issues of each of the journals.  In

one of them is a paper about the ISAS VTVL demonstrator:

http://rosina.catchword.com/vl=50987007/cl=13/nw=1/fm=docpdf/rpsv/catchw
ord/aiaa/00224650/v38n1/s10/p36

It answered a couple questions I had about the vehicle:

Q: What is the attitude control?
A: Nitrogen thrusters at the top of the vehicle.

Q: What is up with the bright orange exhaust plume on a hydrogen engine?
A: Engine throttling is by throttling the oxygen only, so at hover or 
descent it is running WAY rich.

Ground support is billed as extremely streamlined for lox/hydrogen, but
it 
still seems pretty shitty from a peroxide engine standpoint, with
several 
hours of work necessary for a 20 second maximum flight.

I have a half dozen or so AIAA books, but I am moving into a new house
with 
a real library soon, so I am sorely tempted to pull a rare 
extravagant-rich-guy thing and say "send me EVERYTHING!!!". :-)

John Carmack


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