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

From: Paul B.
Sent on: Saturday, July 14, 2012 9:45 AM
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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