[sugpro] Re: Hello Sugpro
- From: Ben Brockert <wikkit@xxxxxxxxx>
- To: sugpro@xxxxxxxxxxxxx
- Date: Tue, 10 Feb 2015 19:57:24 -0500
You might be thinking of the quite instructive
http://www.nakka-rocketry.net/knpurify.html
I could see the appeal of using off the shelf stuff, though.
Glad to see sugpro activity.
On Tue, Feb 10, 2015 at 7:49 PM, Michael Monteith
<dmarc-noreply@xxxxxxxxxxxxx> wrote:
> Andrej,
> I thought I had read somewhere that there is a way to separate out
> the anti-caking part. Might of course be in one of my books that's packed
> for the moved and won't be here until like the first week of March. Uggh
> But maybe someone here has surely been through that feat before.
>
> Michael
> --------------------------------------------
> On Tue, 2/10/15, Andrej Vrbec <dmarc-noreply@xxxxxxxxxxxxx> wrote:
>
> Subject: [sugpro] Re: Hello Sugpro
> To: "sugpro@xxxxxxxxxxxxx" <sugpro@xxxxxxxxxxxxx>
> Date: Tuesday, February 10, 2015, 4:30 PM
>
> Ah, OK
> that makes it clearer. I thought that you have a 70cm BRB
> GPS version.No, I
> don't use any clamping. I know that clamping should
> improve density but I haven't yet come to try this. I
> typically get grains to about 97-97,5% of ideal density.
> I did
> quite some experimentation with different grades of
> potassium nitrate. My goal was to develop a mixing and
> casting technique that would allow me to use a fertilizer
> grade potassium nitrate which is very cheap and readily
> available. I've tried many different grades, particle
> sizes, pH values, defoamers, surfactants, vacuum
> degasing, you name it I've done it. In the end I just
> couldn't get the same high density propellant as I get
> when I use a food grade potassium nitrate without anticaking
> agent. I've read that a lot of people use fertilizer
> grade KN with good success but it wasn't working for me.
> Surfactans and defoamers helped to some degree but still
> the density was lower than with a food grade KN. It seems
> that anticaking agents used in this potassium nitrate
> fertilizers have a significant efect on wetting abilities of
> molten dextrose. as they make the KN particle surface more
> hydrofobic. All these problems went away when I switched
> back to a potassium nitrate without anticaking agent, which
> is twice the price of fertilizer grade, but gives very
> good results. So far I
> didn't have any problems with disbonding even in large
> grains. The material I use for the inhibitor is not a
> paper, but a gasket material called Tesnit BA-202, which is
> made of organic fibers and nitrile rubber. I cut the
> material to correct size to fit snugly in the steel tubular
> holder which is then heated in an oven to 150°C as well as
> base and a coring rod. Just before pouring, the mould is
> pulled from the oven and the propellant is cast. Here is the
> link to this material website: http://donit.eu/material/ba-202/ I
> use 0,5mm thickness and the factory that makes it is
> conveniently located just a few kilometers from my home
> :)
> Andrej
>
> From: Richard Nakka
> <richard.rocketry@xxxxxxxxx>
> To:
> sugpro@xxxxxxxxxxxxx
> Sent: Tuesday, February
> 10, 2015 8:55 PM
> Subject: [sugpro] Re:
> Hello Sugpro
>
> Andrej,
> Thanks for the info. I
> actually bought the new BRB900 unit, which
> comes with a simple GPS receiver. Great thing
> about this unit is that
> no amateur radio
> licence is required.
>
> To
> keep this post on-topic, here's a question about your
> propellant
> grains (beauties, by the way). Do
> you cure the KNDX under pressure or
> clamping? To prevent disbonding. I've
> temporarily migrated to KNSB to
> get good
> bonding (I use clamping pressure), but would like to get
> back
> to using KNDX...to hopefully get those
> nice flat thrust curves that
> your motors
> exhibit :-)
>
> Richard
>
>
>
> On Tue, Feb
> 10, 2015 at 1:06 PM, Andrej Vrbec
> <dmarc-noreply@xxxxxxxxxxxxx>
> wrote:
> > Hi Richard
> >
> > It's nice to hear
> from you again. You are right, the propellant is plain
> > KNDX. I've also experimented with
> other sugars (sorbitol, erythritol and
> >
> mannitol) but in the end I decided in favor of dextrose.
> > Bigredbee GPS was a real game changer at
> least for me as I don't have large
> >
> open spaces to fly from. I fly from a small clearing in the
> middle of the
> > dense forest and so far I
> haven't lost a rocket yet. BRB GPS is very easy to
> > set up. First you must download a
> configuration software from BRB website.
> > When you connect the GPS to the computer
> you can make settings like how
> > often do
> you want it to report location and altitude, your call sign,
> output
> > power, etc. On the ground you
> will need some kind of radio setup that can
> > decode incoming APRS data packets sent
> from BRB GPS. There are a lot of
> >
> options but mostly it comes down to how much are you willing
> to spend. Based
> > on my experience I
> would say that the best option for rocket use on the
> > field would be an all-in-one radio such as
> a Kenwood TH-D72 or a Yaesu
> > VX-8GR
> (recently discontinued) or Yaesu FT1DR. These radios are
> pricey but
> > very easy to carry around
> when you are chasing you rocket as you don't have
> > to have several pieces connected with
> cables as would be the case with an
> >
> ordinary radio connected to a TNC (terminal node controler
> such as Byonics
> > TinyTrak4) and a
> separate battery. When the radio receives the data packet
> > from BRB GPS it decodes it and displays a
> current altitude, latitude and
> >
> longitude. When the rocket lands you take the last known
> coordinates and
> > punch them into a
> handheld GPS receiver or if you have one of the above
> > mentioned radios it will display a
> distance and direction to the landing
> >
> site.
> >
> > Andrej
> > ________________________________
> > From: Richard Nakka <richard.rocketry@xxxxxxxxx>
> > To: sugpro@xxxxxxxxxxxxx
> > Sent: Tuesday, February 10, 2015 4:36
> PM
> > Subject: [sugpro] Re: Hello
> Sugpro
> >
> > Amazing
> work, Andrej...! Your rockets are beautifully crafted.
> > Congratulations!
> > I
> particularly like your nice flat thrust curve, that's
> KNDX, right?
> >
> > GPS
> is a clearly a real boon to rocketry recovery, as your
> flights
> > demonstrate. I recently
> purchased a big red bee GPS and look forward
> > to flying it soon....although I must admit
> I haven't quite figured out
> > how to
> use it ...
> >
> >
> Richard
> >
> >
> >
> >
> >
> >
> >
> On Tue, Feb 10, 2015 at 3:16 AM, Andrej Vrbec
> > <dmarc-noreply@xxxxxxxxxxxxx>
> wrote:
> >>
> >>
> Hello guys
> >>
> >>
> I have just recently found out that Sugpro is active again.
> I really
> >> missed
> >> it, as it was always fun to read what
> others are doing with sugar
> >>
> propellants.
> >> Recently I have
> sucessfully flown a sugar rocket to 8km. Here are the
> >> videos
> >> of the
> motor static test and the flight:
> >>
> >> https://www.youtube.com/watch?v=Q2YJtmsqKSU
> >>
> >> https://www.youtube.com/watch?v=z4QmCuDgi_w
> >>
> >> https://www.youtube.com/watch?v=zImHsYWY9-s
> >>
> >> Before that I
> also made a sucessfull flights with a 100mm M motor. You
> can
> >> see the videos here:
> >>
> >> https://www.youtube.com/watch?v=JJlIXvbbtNA
> >>
> >> https://www.youtube.com/watch?v=d_AweYPlwkk
> >>
> >> How many
> subscribers is there currently? I hope that most of the
> folks
> >> from
> >>
> the old Sugpro will join the new list.
> >>
> >> Best
> regards
> >> Andrej Vrbec
> >
> >
> >
>
>
>
>
>
>
Other related posts:
