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SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun

Posted by: Rob Goldsmith - Tue Dec 23, 2008 10:48 am
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SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun 
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Post SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Tue Dec 23, 2008 10:48 am
December 23, 2008 - RAMNICU VALCEA
Haas, ARCA's orbital rocket launcher unveiled today. A series of media events, scheduled for next year, will be announched in short time.

Download 3.1Mb brochure.
http://www.arcaspace.ro/orbital/images/ ... uncher.pdf

Photo gallery.
http://picasaweb.google.com/arcaorbital ... t_launcher

Image

Stabilo-ELL engine on test stand. Stabilo-ELL will be launched using hybrid engine technology instead of monopropellant technology.

Photo gallery.
http://picasaweb.google.com/arcaorbital ... rid_engine

Image

"As I promised in May, we intended to launch STABILO-ELL vehicle in autumn of 2008. There were several events that forced us to delay the launch.

Image

First, we are switching from monopropellant to hybrid propulsion. Inevitable, this lead to delays. The hybrid propulsion is the one that we are using for the Google Lunar X Prize Competition. STABILO was designed to become the ELE’s first stage and we planed to use hybrid propulsion for this launch.

Second, when we were about to start the propulsion tests, a personal health problem prevented me to work within the team. The tests were put on hold. I wasn’t available for about three months.

Finally, the team focused on the Haas orbital rocket launcher and on our governmental programs.

The team resumed the work on the Stabilo-ELL suborbital vehicle two month ago, after my return. We rescheduled the Stabilo-ELL launch for the begining of 2009. We hope to avoid further delays. For this end of the year I just hope that you will enjoy the Haas vehicle. We wish you Merry Christmas and a Happy New Year!" - Dumitru Popescu, ARCA Team Leader

Please feel free t discuss this topic further...

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Post    Posted on: Tue Dec 23, 2008 11:14 am
What an amazing looking rocket! :)

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Post    Posted on: Tue Dec 23, 2008 9:11 pm
It's huuge! I really thought that something launched from a balloon would be a bit smaller. :shock:

One question though: did I miss something? how are they going to steer that thing? I don't see any gimbal/vanes/differential throttling abilities/reaction control system (thrusters)?

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Post    Posted on: Thu Dec 25, 2008 2:57 pm
I'm interested in how their extendable nozzles are going to work out, more so how they are going to set them up etc. also their staging attachment points, which is the next stage nozzle I gather.....


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Post    Posted on: Thu Dec 25, 2008 5:46 pm
Marcus Zottl wrote:
One question though: did I miss something? how are they going to steer that thing? I don't see any gimbal/vanes/differential throttling abilities/reaction control system (thrusters)?


you can't find them since it's only a fundraising "papier rocket" (good for the "Carnival of Space") designed by an experienced team of sex-toys' engineers... :oops:

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Post    Posted on: Thu Dec 25, 2008 11:53 pm
grow up


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Post    Posted on: Thu Jan 22, 2009 8:35 am
The whole thing is made out of composites? Thats impressive.

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Post    Posted on: Sun Feb 08, 2009 10:53 pm
Hi guys,

Haas will be launched much later and yes, there will be thrusters. For Haas we are testing the technology for this size but for Stabilo we are already testing the engine.

All our efforts are focused on the next launch.


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Post    Posted on: Mon Feb 09, 2009 11:31 am
Thanks for the update Bogdan!

Best wishes to you and your team!

Rob

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Post Re: SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Mon Sep 14, 2009 10:46 am
There is a mission 3 video up on youtube for those that have not seen it already
http://www.youtube.com/watch?v=4qVuVix5kCE

Very cool, be awesome if they pull it off with no problems!!!
Due to launch very soon I take it!

Good luck guys


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Post Re: SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Mon Sep 14, 2009 8:43 pm
That is how videos should be done.

Quote:
Helen will be using a gravitational stability method in vertical flight without aerodynamic surfaces or jet commands, by towing the component stages and payload. The towing can be made by cable, or rigid-articulated system.
In order to have a stabilized rocket in vertical flight, in gravitational field, this method is using a towed mass in the same direction with the thrust. This mass consists in the next rocket stages and payload. The stability effect depends of several elements: the mass of the stabilized body, the mass of the towed mass and the length between the centers of gravity of the stabilized body and the stabilizer body.
This method can be applied in the extra atmospheric space on vertical ascendant or descendent trajectory under the influence of gravitational field.


I suppose it gets around the Pendulum Fallacy by being non-rigid? Interesting.

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Post Re: SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Mon Sep 21, 2009 9:56 am
Yes, this is the point. By building a non-rigid structure, we create 2 systems: the rocket (for instance stage 1) and the rest (cables, next stages and capsule). This second system is connected with 4 cables that converge to a point below the first system. The first system is rigid. If this system has let's say a 5 degrees angle left from the vertical, the tension in the 4 wires will be different. The non-rigid system below will not have this 5 degrees angle from the vertical. Therefore, the tension on the wires that are connected closer to the right side will be much higher then the tension from the wires that are connected closer to the left side. If we decompose this forces, we get a small horizontal force applied at the bottom of the first system, oriented towards the left. This will tend to stabilize the rocket.

The math is complicated, there are lots of variables. We will encounter oscillations in the cables, shocks when starting the engine, other effects because there is still a thin atmosphere out there. However, it works in our simulations. Very soon we'll see how it works for real.

This is our Popescu-Diaconu stabilization method. Stay with us...


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Post Re: SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Tue Sep 22, 2009 3:22 pm
Quote:
This is our Popescu-Diaconu stabilization method. Stay with us...


And, do you believe Robert Goddard (and so many early rocket experimentalists) was so idiot that he did not realize (after his failed test from 1926) that a non rigid structure, a rocket composed from two parts tied to each other with ropes would fix his instability problems?

Come with facts people from ARCA, prove using Newton's laws that your Popescu-Diaconu method is not a fallacy.


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Post Re: SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Wed Sep 23, 2009 4:58 pm
I cant find the dates for their launches.
Has anyone got a link to the press release suggesting launch dates?

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Post Re: SFS News: ARCA - Haas Orbital Rocket Launcher for Google Lun   Posted on: Thu Sep 24, 2009 4:41 am
1) The launch will be in October 2009. The exact date is not known.
2) ARCA should postpone the launch and rethink the stabilization mechanism of Helen rocket. Otherwise, it will simply crash.
More details can be found at the following link::
http://www.googlelunarxprize.org/forum- ... &start=105


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