[AR] Re: "How Hard Can It Be" rocket episode
- From: George Herbert <george.herbert@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Tue, 19 Nov 2013 11:25:19 -0800
For liquids, one might consider recovering using a front-mounted propellant
tank (possibly open-cell foam filled) with integral nosecone, with
mid-mounted electronics with a really good shock mounting and really SOLID
nose bulkhead between it and the front tank, and just use lawn darting
recovery and assume replacement of the nose tank after flight.
It does have the somewhat problematic issue of the heavy-ish motor being
aft, but you could weight the nose enough to get nose-first recovery when
empty, or ensure the electronics package is heavy enough, or ...
On Tue, Nov 19, 2013 at 10:18 AM, Bill Claybaugh <wclaybaugh2@xxxxxxxxxx>wrote:
> My impression is that this is not quite correct for large store bought
> motors and careful builders: big store bought motors are expensive enough
> to make getting them back worthwhile for most hobbyists.
>
> Since I build my own--and since I combine the motor and airframe--I pay
> only the direct cost of materials and avoid the airframe altogether, which
> cost is far less than the full marked up cost of motors and airframes. That
> makes recovery much less economic to me (especially since the fins and
> nozzle typically survive impact, meaning only the tube and bulkhead require
> replacing); even so, it is worth recovering the electronics: a simple video
> telemetry system can easily approach $2000, including hardware.
>
> Bill
>
> Sent from my iPhone
>
> On Nov 19, 2013, at 12:41, "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
> wrote:
>
> > This speaks volumes to me about the state of the art in rocketry.
> > Rockets are not flown for their data or telemetry. It's all about the
> > big whoosh and that's pretty much it. Why even bother with recovery as
> > none of the rockets fly twice. Get live telemetry and just get the CG
> > set for flat spin and let her go. Have a sliding weight/payload that
> > moves the CG back after apogee.
> > Ballistic anyway as far as I can tell- I know of 3 of these same
> > rockets never found at black rock.
> >
> >> -------- Original Message --------
> >> Subject: [AR] Re: "How Hard Can It Be" rocket episode
> >> From: David Weinshenker <daze39@xxxxxxxxxxxxx>
> >> Date: Tue, November 19, 2013 9:47 am
> >> To: arocket@xxxxxxxxxxxxx
> >>
> >>
> >> Uwe Klein wrote:
> >>> George Herbert wrote:
> >>>> 50 foot long bright colored streamer. Small weight on one end. SD
> card in
> >>>> the middle, in a little pouch...
> >>>
> >>> When do you separate the storage?
> >>>
> >>> You want to have data to the last nanosecond if possible.
> >>> Also the crash site unusually is the easiest to find.
> >>>
> >>> Just harden the storage to a level that makes
> >>> the surrounding vehicle into a sufficiently effective
> >>> crash zone.
> >>
> >> Maybe just put the streamer on the memory chip, and wrap
> >> it up within the electronics package, so that if it becomes
> >> dislodged on impact you can find it easily in the debris field.
> >>
> >> -dave w
> >
>
>
--
-george william herbert
george.herbert@xxxxxxxxx
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