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SFS News: TrueZer0 - latest tethered flight test

Posted by: Rob Goldsmith - Sun Sep 21, 2008 8:11 am
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SFS News: TrueZer0 - latest tethered flight test 
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Post SFS News: TrueZer0 - latest tethered flight test   Posted on: Sun Sep 21, 2008 8:11 am
To the untrained eye, this is probably one of the uglier flights we've made. But to us, it is incredibly encouraging.

http://www.youtube.com/watch?v=tk4DUC9dG5A

First, the throttle is working very smoothly... Not wanting to send the vehicle to the top of the tether like last time, we tried to gingerly get it into the air. As you can see, the takeoff is nice and gradual. Second, the vertical stability control loop is working for the first time, and it appears to be working quite well. As the vehicle ascends, it is pointed solidly in a constant direction until it hits the tether. In fact, looking at the gyro data, you can see that the control system did a fine job of keeping the vehicle from rotating during the (admittedly short) ascent.

Image

The X, Y, and Z gyro axis are represented by the red, green, and blue lines respectively. Full scale on that graph is about 300 degrees/second. The fact that the graph stays flat up until the vehicle hits the tether just before second 858 makes us very happy.
Finally, both Scott and I aborted the flight pretty much simultaneously. I told the flight computer to shut down, and Scott triggered the safety system. This is the first time the safety system has been used to end a flight, and it worked without problems. (You can see the nitrogen venting from the top at the end of the flight).

The test was not without some issues however.

When the vehicle ascended, it was supposed to go straight up. Apparently the control system thought up and to the right was the better choice. We'll be looking at the data to work out what happened.
Also, after it hit the tether, the control system got a little aggressive trying to correct, and flung the vehicle up and to the left pretty hard before we aborted. The abort was energetic, and some pieces of the vehicle got bent. At the same time, the telemetry antenna got caught in the tether and was broken off. None of the damage was major, and it should all be fixed over the next few days.

The next step is to widen the flight envelope a bit. George's forklift has been great, but we need to give the vehicle a little more freedom so we can see how it will behave. Something along the lines of that telescopic forklift that Unreasonable is using would be really nice if we can find one inexpensively.

Please feel free to discuss this topic further...

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Post    Posted on: Sun Sep 21, 2008 8:26 am
This looks very interesting!

Getting a lot of progress from Armadillo, Unreasonable and now these guys to! Be good to get some more info, i can't find any contact details anywhere.

Great stuff!

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Post    Posted on: Mon Sep 22, 2008 8:31 am
You are right. There is no Info whois or how to contact Turezer0 on that page of them.

so here is what i got form a whois truezer0.com :

Quote:
This WHOIS database is provided for information purposes only.
We do not guarantee the accuracy of this data. The following uses of this
system are expressly prohibited: (1) use of this system for unlawful
purposes; (2) use of this system to collect information used in the
mass transmission of unsolicited commercial messages in any medium;
(3) use of high volume, automated, electronic processes against this
database. By submitting this query, you agree to abide by this
policy.

Registrant:
TrueZero
1735 N. Paulina St. #503
Chicago, IL 60622
US

Domain Name: TRUEZER0.COM

Administrative Contact, Technical Contact, Zone Contact:
TrueZero
Scott Zeeb
1735 N. Paulina St. #503
Chicago, IL 60622
US
(773)791-8457
szeeb@designintegrity <dot> com

Domain created on 04-Apr-2008
Domain expires on 04-Apr-2009
Last updated on 04-Apr-2008

Domain servers in listed order:

NS.CT0.COM
NS.E93.ORG


There is at least an emailadress you can contact now.


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Post    Posted on: Mon Sep 22, 2008 4:09 pm
blimey, good info!

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