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'[EE]: Water Rockets list?'
2002\06\28@095248 by Doug Butler

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Where is this Water Rockets list?  It sounds interesting!  I have had
thoughts about various "fireless" model rockets, most involving superheated
steam.

Doug Butler
Sherpa Engineering

On Thu, 27 Jun 2002, Russell McMahon wrote:
>
> >At one stage on the Water Rockets list they got as far as raw deer liver,
> >but the list survived (not without some getting upset).

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2002\06\28@142816 by Brendan Moran

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Hmmm... Supposing the water-rockets people and the [EE] PIC people were to
get together on the idea of going for altitude... Can you imagine? PIC timed
stages...  PIC controlled pressure release valves...  It would be a thing to
behold.

--Brendan

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2002\06\28@151121 by chucksea

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homes.managesoft.com.au/~cjh/rockets/list/


On Fri, 28 Jun 2002 11:29:12 -0700 Brendan Moran <spam_OUTbmoranTakeThisOuTspamMILLENNIUM.CA> wrote:


Hmmm... Supposing the water-rockets people and the [EE] PIC people were to
get together on the idea of going for altitude... Can you imagine? PIC timed
stages...  PIC controlled pressure release valves...  It would be a thing to
behold.

--Brendan

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2002\06\28@154142 by Madhu Annapragada

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Thanks Brenda; and thanks for the rush job on the servo board. I appreciate
it. The rest of the jobs from this place will be more sedate in the future.
Thanks
Madhu

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2002\06\28@155758 by Doug Butler

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Well my thought was to fill the rocket nearly or completely with water, put
it on the launch pad, get a very long ways away..., and then electrically
heat the water and launch.  So there are lots of possibilities for PICs to
control heating, safeties, etc.

Doug Butler
Sherpa Engineering


> {Original Message removed}

2002\06\28@160618 by Madhu Annapragada

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Sorry about that . Wrong address. I apologize.
Madhu

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2002\06\28@163146 by Martin Baker

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Ahhh... In my youth I was affiliated with Rocket Research Institute, the
youth oriented, basement bomber wing of Aerojet General. We designed and
built " Model " rockets. Six foot long tubes of steel filled with
Zinc-Sulfur fuel in little paper cartridges. One experiment, germane to
this slightly o.t. thread, was a steam rocket. This was a welded stainless
pressure chamber with a nozzle and burst plate. It was heated from the
outside by a number of furnace burners, inside a trashcan shield, fed with
natural gas from a tank.

At the burst pressure, it took off....flew about 1/3 mile if I recall. The
landing was, shall we say, abrupt. If one were to manage the system
differently, a pic would be perfect for pressure determination, and
couldlift pins out of a burst plate restrainer....hmmmm....

At 03:56 PM 6/28/02 -0500, you wrote:
{Quote hidden}

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2002\06\29@024938 by Russell McMahon

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> Well my thought was to fill the rocket nearly or completely with water,
put
> it on the launch pad, get a very long ways away..., and then electrically
> heat the water and launch.  So there are lots of possibilities for PICs to
> control heating, safeties, etc.

Heating water to make a "Steam" rocket is a well defined art. Performance is
not stunning compared to common chemical rocket alternatives but lots of
fun. Isps of over 100 are achievable AFAIR. As a comparison, Black Powder is
about Isp=80, Sugar & Pot Nitrate 120, Ammonium Nitrate etc 200 ish,
Ammonium Perchlorate & hydrocarbon & Al 250 ish (Space Shuttle solid rocket
boosters) , Liquid oxygen with various 3000 to 350, Loquid Hydrogen & Oxygen
up to around 450 ish at high pressures (Space Shuttle Main engine).

For air and water only filled rockets best fill is about 1/4 water at
typical pressures. A 1.5l pop bottle goes to 100 metres plus (small dot in
sky) at 130 psi. A fluorescent light protector with lots of experience goes
to 700to 800 feet and a 2 stage fluro design (3l booster plus tube) to about
1100 feet.

       RM

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2002\06\29@080717 by Peter L. Peres

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On Fri, 28 Jun 2002, Doug Butler wrote:

>Well my thought was to fill the rocket nearly or completely with water, put
>it on the launch pad, get a very long ways away..., and then electrically
>heat the water and launch.  So there are lots of possibilities for PICs to
>control heating, safeties, etc.

Fill the rocket with H2O2 instead and discharge MnO2 into it explosively
from an electrically detonated vial ? With a burst plate at the nozzle ?

Peter

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