Both gravimetric and volumetric.
My personal understanding has always been that any discussion of liquid fuels should be only academic in nature. It might be nice to know a little bit about why the professionals make the choices that they make but liquid fuels are too expensive and too dangerous for ordinary people to screw around with. I'm happy to watch, on television or on the internet, from FAR away (and maybe see a "live" launch someday from several miles away) but I'm too fond of ordinary things like... skin... and breathing... to even think about playing with those things myself.
Well, with one exception. We are allowed Methyl or Ethyl alcohol with Nitrous Oxide. Google Tribrid.
5.2.1. With the exception of nitrous-oxide hybrid rocket motors, liquid rocket motors are
generally prohibited at Tripoli Research Launches. BOD approval may be given for very
well documented liquid motor projects. All such projects must be submitted to the TRC
for review and recommendation to the BOD
Not in general. Tribrids, Alcohol-NOX, etc., requires TRA BOD permission. Special case for an advanced team, well documented. You won't see anything but standard hybrids at local launches.
[U]https://www.tripoli.org/SafetyCode[/U]
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