[AR] Re: Spartan: Hovering hybrid
- From: George Herbert <george.herbert@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Fri, 17 Oct 2014 00:38:03 -0700
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
>
> .
>
>
>
>
>
Other related posts:
