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Re: Version 2.0, Re: [gctechspace] Building a group gctechspace rocket?

From: Steve D.
Sent on: Saturday, July 14, 2012 9:27 PM
Sounds like there is a rocketry project there.... I would suggest you guys form a team and do it as a proper project like we are doing with reprap. Organise some meetups, get a team, Put it on your own mailing list and give summaries to the main list of how you are going. You can demo stuff at the open evenings.

On Sat, Jul 14, 2012 at 1:03 PM, Ing. Walter Hartmann <[address removed]> wrote:
Modern Rockets,
fastest Arduino
chemicals for coloured smoke trails, quick burn, steady burn, smoke delay, ejection type . , ,
add Mesh Potatos & they talk to each other in flight to synch.
Fireworks could be propelled to a new level after 1500 years ;)
hasn't been done b4, novel, not obvious ==> can be patented ;)


On[masked]:45, Paul Breuker wrote:
Hi my work colleague in Sydney has launched an Arduino on his ( making it the fastest Arduino?!) he's was checking temp and altitude with his
They normally launch in WA as there is more empty sky there
Regards Paul B

On Saturday, 14 July 2012, Lucas Brandt wrote:
Can you bring in any rocketry equipment you have when your in next and we'll take a look?
Perhaps get a few smaller kits to spark some interest first before we build a big one and see how we go :-) 

On Thu, Jul 12, 2012 at 10:41 AM, Ben Martin <[address removed]> wrote:
Howdee ya'll,
  Since there was rumbling interest on getting the rocket project off
the ground, so to speak, I thought I'd send through an updated hat in
the ring email.

I'd still go with the Ariel/HAMR combination. If anyone has experience
rolling carbon fibre or is interested in making custom fibre glass fins
then I have a fin model which is stable in flight (my first and foremost
concern) and will give 20% better apogee than the kit fins.

Ultimately I'd hoped to 3d print a mold with the reprap and create the
fins with a custom air foil / taper design. Wider at the edges where
more benefit can be gained and while maintaining a linear width cross
section to chord ratio relative to the base of the fin. I'll probably
construct such a design eventually because it seems very interesting.

Another option would be to make the ariel standard and the next one with
custom fins.

One thing I would change from my previous proposal is the rocket motor
to a cesaroni. Much less cleaning and o-ring details...

On Fri,[masked] at 07:21 -0400, Ben Martin wrote:
> Hi everybody!</dr nick>
>   You might remember me from such rocket launches as the one many
> gctechspacers attended. I've been sniffing around the parts list working
> out the bill of materials for the upcoming rocket for a little while. It
> occurred to me today that perhaps the folks at the gctechspace or the
> space itself would like to construct a rocket and tinker with radio
> stuff for tracking.
>   While I'm certainly no expert at this, I'd be happy to schedule a
> "rocket day" at the space where everybody could come along and we could
> put the thing together there. If it is the tech-"space" rocket it might
> also make a good exhibit for folks who drop by.
>   So I'm sort of also throwing out the idea of a group owned rocket. As
> the costs can be quite noticeable even at this level of rocketry.
>   I find the science behind this quite interesting, IMHO it would have
> made many more folks get an "A" in physics at school if there was a
> rocket building prac ;)
> Having constructed a rocket recently, I have jb weild and general
> purpose epoxy, and many other little useful bits that are handy when
> putting one of these little beasties together. Things like buying bulk
> epoxy can really help costs. I'm also a QLD rocketry society member, so
> am able to launch rockets at their meetings.
> I was thinking about this rocket:
> Hard to choose, happy to change.
> My rationale is it has a dedicated electronics bay, 3 inch tube (a trade
> off in height / internal space), and, pending clarification a 54mm motor
> mount tube. The motor tube is also rather long, giving a great selection
> to choose from for motor. With a step down motor mount to 38mm it should
> reach about 1300m on a I600 motor. There is a break in the certification
> needed going from I to J class motors (you need level 2).
> Anyway, looking over the parts:
> $145 Ariel rocket kit
>   60  HAMR aft motor ring
>   37  54-38 step down
>  [masked] for reloadable 38mm case
>   38  motor case adaptors to use less propellant in larger case
> + rocket rails ($5) and other bits I might have forgotten.
> Once off cost is about $430. The reloadable case price varies depending
> on how much force the case is designed to contain.
> A sample of the motor components which are then needed and used up for
> each flight are:
> $37 H242T - 591m apogee
> $56 I161W - 776m
> $93 I600R - 1291m - 296m/s max velocity
> On the other hand, throw a J800T 54mm motor in it ($152) and get 2km up
> with a supersonic 424m/s top out.
> Some links for the interested:

Lucas Brandt
Vice President



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Steve Dalton, President
Gold Coast Tech Space
3b/51 Johnston St, Southport, Q 4215
+61 [masked]

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