[AR] Re: Spartan: Hovering hybrid
- From: Korey Kline <k2@xxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 17 Oct 2014 10:07:15 -0400
Did Masten ever get the four engine version to hover? Has anybody?
On Fri, Oct 17, 2014 at 9:50 AM, <joesmith@xxxxxxxxx> wrote:
> Even Armadillo was able to hover. Masten as well.
>
>
> On Fri, 17 Oct 2014 00:38:03 -0700, George Herbert <
> george.herbert@xxxxxxxxx> wrote:
>
> For some reason I jump straight to a single centerline hybrid with cold
> nitrous gas attitude control, but each to their own...
>
> George William Herbert
> Sent from my iPhone
>
> On Oct 16, 2014, at 2:44 PM, "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
> wrote:
>
>
> 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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