[AR] Re: Spartan: Hovering hybrid
- From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Fri, 17 Oct 2014 08:44:55 +1100
Jon,
You’re thinking in liquid mode ie. LOX. You need to think monoprop oxidizers
eg. Nitrous or Peroxide. If you look at Nitrous:PE for example, the performance
for O:F ratios between 5:1 to 10:1 is pretty much the same. The internal bond
energy of the oxidizer provides a significant portion of the propulsion energy.
Saying that, I generally agree that typical hybrids aren’t suited for this
application although if your expertise is in hybrids and you’re really
comfortable with them…
Troy
...Because once you've done all the work to figure out how to do fire and
throttle valves, building another set with slightly different characteristics
is just too hard. Much easier to deal with a chamber that changes geometry
throughout the burn, and where you have no real control over mixing efficiency.
I mean, cool if they can pull it off, but I've got to scratch my head on why
they'd do it that way. There *are* places where hybrids might make sense, but I
have a hard time believing a hovering vehicle is one of them. Unless bobbing
around like crazy in a semi-controlled fashion is good enough.
Sorry if that came off overly negative, I just wonder about people's design
choices sometimes.
~Jon
On Thu, Oct 16, 2014 at 8:12 AM, Mark C Spiegl <mark.spiegl@xxxxxxxxx> wrote:
I have no connection with these guys.
They're building an LLC type vehicle using hybrid rocket motors instead of
biprop.
http://www.spartanproject.eu
--MCS
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