New personal best altitude

Water Rockets NSW

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air.command
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New personal best altitude

Postby air.command » Mon Jun 02, 2008 10:14 am

We had another great day this weekend launching rockets at the NSWRA launch meet. There was a unique opportunity to launch during fog to see if we could get video from above it, and we managed to get a personal best altitude with our Polaron VI rocket.

Full details, photos and a highlights video of the day is available here:

http://www.AirCommandRockets.com/day61.htm

Flying above the fog.
Image

Trying to figure out if we should launch the tripod, step ladder or the rocket.
Image
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Postby Wingnut » Mon Jun 02, 2008 12:46 pm



Very... very... cool George!

The video make me want to head out to the launch site right now.

Mike

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Postby skippy » Mon Jun 02, 2008 6:20 pm

Absolutely brilliant video!
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Postby Kryten » Mon Jun 02, 2008 10:18 pm

Umm - Youtube says that video is no longer available?
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Postby air.command » Tue Jun 03, 2008 8:04 am

Kryten wrote:Umm - Youtube says that video is no longer available?


Hmmmm, I was able to access it this morning, both from YouTube direct and from our site as well, I wonder if it was a temporary thing?
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Postby Andrew Burns » Tue Jun 03, 2008 10:18 am

It gives me the same message when I try to watch it, could you post the direct link to youtube?

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Postby air.command » Tue Jun 03, 2008 10:20 am

http://au.youtube.com/watch?v=bWb28IjQiUs

Please let me know if the link works or not.
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Postby Andrew Burns » Tue Jun 03, 2008 10:42 am

Nope I get "This video is no longer available" from that link as well.

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Postby air.command » Tue Jun 03, 2008 10:49 am

I have been doing a bit of reading and quite a few people are experiencing the same problems with various YouTube videos (not just ours). One solution that is often mentioned is:

"Turning off Google Web Accelerator solves the problem."

Andrew, could you please do a test for me and go directly to youtube.com and see if you can find the video and see if it will play for you that way? Search for: "water rocket with boosters 637" It should be at the top of the list. (5:00 minutes long)
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Postby Andrew Burns » Tue Jun 03, 2008 11:06 am

Nope, same error again. I've never installed any google toolbar or similar type thing so I don't think I have a 'google web accelerator' installed.

Tried it in both IE and firefox and I get the same error.

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Postby ~RR~ » Tue Jun 03, 2008 11:10 am

both links work for me :? I use Firefox ...
ohh, and congratulations George... 637ft :shock:
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Postby whipfest » Tue Jun 03, 2008 11:21 am

It also worked OK for me on both sites, late last night (IE, at home).

I can't access youtube at the moment at work, as my work's network blocks their URL :evil:

I'll try again tonight.

Congratulations on the flight George! It looked really good. The kids got a real buzz out of seeing the little chutes on each booster 8)

Did you guys work out what happened on the last flight ? (glad the damage was only minimal!)

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Postby air.command » Tue Jun 03, 2008 11:42 am

Thanks for the feeback guys.

Andrew: also thanks for the test, it may be a firewall or filter issue perhaps.
I have uploaded the video to MySpace as well, perhaps you may have more luck that way.

http://vids.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=35425339

Did you guys work out what happened on the last flight ?


Not 100% sure, but we reviewed the video frame by frame and it is likely to be just plain stability issue. One of the big problems with water rockets is the amount of weight they have near the tail end of the rocket. Generally the water exits quite quickly so the Cg also moves up rapidly during flight. With this particular rocket it has a small nozzle (7mm) and a quite a lot of water (2.4L) so it takes some time before all of it goes. We do this to get the low but long duration thrust, while the boosters have a lot of thrust over short amount of time.

We have two easy options here, either make the nozzle bigger to empty the water faster or we can add more nose weight and bigger fins. Bigger nozzle probably makes more sense in terms of efficiency.

There are also water rocket designs that keep the water at the top and the compressed air below. We may want to explore that design although it is not as efficient.

From the video it did not look like any of the boosters caused the rocket to pitch over.
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Postby Andrew Burns » Tue Jun 03, 2008 4:37 pm

Not sure how it would be a firewall problem, I can see other youtube videos, even other ones you've uploaded. Also that myspace version is telling me "video has been deleted".

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Postby Avachovy » Tue Jun 03, 2008 5:49 pm

finally got around to watching the video and WOW! pitty i didnt make it down there, next time!
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