[SS-VehDev] Re: [SS-MAIN] Run Time(s)

Wed Dec 14 09:34:48 PST 2005

Oh?  I was told they had a 48 hour run time.  As manufacturer
specs go I usually take them with a grain of salt.  They are usually
testing in ideal circumstances (72 degree lab, not 110 degree
rocket sitting on the playa).

>From the website:  A single battery will last 5 to 7 days

That's not the conservative figure I was given when I bought my
first one years ago.  I guess the technology has changed.  Who
would have guessed?

Still I think a battery extender is good.  If the rocket falls into
a crevasse we may have to go back the next weekend to continue
the search.

Matt

On 12/13/05, Jim Moses <jamoses at rocketmail.com> wrote:
>
> M,
>
> Thase transmitters already last for many days (>1week)
>
> -J
>
> *Lakestake Rocketry <lakestake at gmail.com>* wrote:
>
> Good afternoon Bill,
>
> There are a number of us who have one or multiple transmitters.
> A loan of these can be arranged for closer to the launch so that
> each part has redundant transmitters.  We would want to 'tag'
> each part that either descends independently, or would do so if
> there is an unplanned separation.
>
> In addition we should add a backup battery to each transmitter.
> The one that ships with the transmitter is good for over 24 hours,
> but by adding another very light battery we could extend each
> transmitter's effective duration to a week.
>
> Matt C
>
> On 12/9/05, william colburn <space1space at sbcglobal.net> wrote:
> >
> >
> > Joe owes me a rockethunter beacon which I will donate
> > to SStS.
> >
> > There will be a few more circuits, but the basic idea
> > is sound. Unless there is a spring loaded arrangement
> > or some other positive disconnect, the connectors
> > should be rearward facing as much as possible to
> > prevent them from hanging up at launch.
> >
> > BC
> > --- Dave McCue <dmccue at uci.edu> wrote:
> >
> > > I propose that the rocket be ground powered by a
> > > "breakaway" circuit that
> > > disconnects at liftoff. A simple diode "OR" circuit
> > > on the vehicle
> > > power bus manages the changeover to vehicle power.
> > >
> > > This arrangement requires that the ground power
> > > system's voltage be
> > > slightly higher than the output voltage of the
> > > on-board battery, but I
> > > expect that the electronic subsystems all do their
> > > own voltage regulation
> > > anyway, so the change in bus voltage should not be
> > > an issue.
> > >
> > > For the college rockets I've been involved with, we
> > > just use a connector
> > > that has a mild friction fit to supply power until
> > > the rocket lifts off
> > > and breaks the connection. Accidental disconnects
> > > are no problem because
> > > the rocket's battery just takes over. You could add
> > > another pin to the
> > > connector for battery status/charging, if desired.
> > >
> > > For vehicle recovery, I strongly suggest using a low
> > > power beacon, such as
> > > a Rocket Hunter tracking transmitter. It has its own
> > > power, is light
> > > enough to be taped to the parachute cord, and will
> > > run for many days. As a
> > > matter of fact, attaching it to the recovery system
> > > is useful for
> > > detecting parachute deployment, becasue the signal
> > > strength will increase
> > > when the transmitter's antenna unfurls at ejection.
> > >
> > > -Dave McCue
> > >
> > > On Sat, 10 Dec 2005 cstrudwicke at optushome.com.au
> > > wrote:
> > >
> > > >
> > > > Can we assume that if a launch is scrubbed, we can
> > > safe the propulsion from remote and approach the
> > > vehicle to re-attach the umbilical ?
> > > >
> > > > This all depends on the method of umbilical
> > > attach/detachment we go for ??
> > > >
> > > > CS
> > > >
> > > >
> > > > > Rich Nakka < richnakka at rogers.com> wrote:
> > > > >
> > > > > craig strudwicke wrote:
> > > > >
> > > > > >I need to make estimates of total payload run
> > > time (for battery and
> > > > > power
> > > > > >converter calcs), so can anyone give me their
> > > best estimates for the
> > > > > >following :
> > > > > >
> > > > > >1. Pad time (ie time on pad after powering up
> > > payloads up to point of
> > > > > >liftoff)
> > > > > >
> > > > > >
> > > > > I would suppose only a few minutes. But take
> > > into account numerous
> > > > > recycles due to scrubbing?
> > > > >
> > > > > >2. Time to apogee
> > > > > >
> > > > > >
> > > > >
> > > > > Time to apogee based on the latest sim (dph49)
> > > is 170 seconds. Descent
> > > > > time depends on the approach we take with regard
> > > to chute deployment and
> > > > >
> > > > > chute size. I've played around with sims that
> > > indicate descent time
> > > > > (from apogee) of between 300 and 500 seconds for
> > > the payload "capsule".
> > > > > Booster descent time should be similar to
> > > capsule to ensure the two
> > > > > components land in same general area.
> > > > >
> > > > > >3. Recovery 'hang time'
> > > > > >
> > > > > >
> > > > > Data acquisition and video can of course end at
> > > touchdown, but
> > > > > transmitters should be powered for 3 or 4 days
> > > (?). Maybe a low power
> > > > > redundant transmitter for weeks?
> > > > > Assuming that the booster & payload descend
> > > separately (which seems to
> > > > > be the way we are going) the booster would need
> > > a power supply for it's
> > > > > recovery transmitters & chute deployment.
> > > > >
> > > > > Richard
> > > > >
> > > > > >Thanks,
> > > > > >
> > > > > >CS
> > > > > >
> > > > > >--
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> > > > > >
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