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High altitude balloon payload, from Sable-3 discussion
mchan
post Oct 19 2007, 08:21 AM
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Good show! All you need is a whiteboard that you can draw on to illustrate your concepts.
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AndyG
post Oct 19 2007, 09:34 AM
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A short piece in the Guardian newspaper this week reported that US Meteorologists used to put signs on their balloon instrument packages, warning finders that they would be fined for not returning the contents. blink.gif

Personally I think UMSF should take the "reward" route.

Andy
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jamescanvin
post Oct 19 2007, 10:11 AM
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Good show Doug.

Parafoils - Genius!

Coming back to the camera pointing issue that you talked about. With two cameras, I'm as torn as you are about having one landscape and one portrait vs both in portrait. I don't think there is a lot in it, and determining which is best is probably rather dependent on how much the gondola is swinging. At the moment I think I'm inclined to go with the 'double portrait' mode to, as you say, maximize the coverage from horizon to nadir. A slight clarification from what you said, you probably don't want to mount them to get from horizon to nadir in one shot, we really want to be getting the horizon in as much as possible. So the first should probably be mounted so that the image centre is pointed somewhat at the horizon (maybe a little below). Hence the bottom edge of the lower camera will be at 60-65 degrees, hopefully low enough so that with a few fortuitous swings we get some direct nadir imaging.

If you can do the tests on the field of view and get an idea of what frame rate we can manage (power, memory), I'll examine some images from other projects to try to get some better statistics on the expected gondola motion and then I'll run some more simulations.


Oh, and about mixing units - I now know who I'll be blaming when we loose it on EDL! rolleyes.gif

James


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ustrax
post Oct 19 2007, 10:33 AM
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Man...you need an haircut... tongue.gif


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djellison
post Oct 19 2007, 11:28 AM
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You need a shave smile.gif
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ugordan
post Oct 19 2007, 11:52 AM
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Hahahah... buuuuurn!


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ustrax
post Oct 19 2007, 11:54 AM
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QUOTE (djellison @ Oct 19 2007, 12:28 PM) *
You need a shave smile.gif


Just did... cool.gif


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AndyG
post Oct 19 2007, 01:14 PM
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QUOTE (jamescanvin @ Oct 19 2007, 11:11 AM) *
Parafoils - Genius!


...and the mark XXIII-or-so could benefit from this in a big way. Assume a 30km release point and a (very poor = easily achievable) 5:1 sink rate, onboard gps and a "clever" payload - it could fly itself back to where it started. Preferably landing in the open boot of the UMSF Support Vehicle. rolleyes.gif

As to Doug's hair - I'd sooner he was nailing stuff together than wasting time down the boutique, Ustrax!

Andy G
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djellison
post Oct 19 2007, 01:51 PM
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QUOTE (jamescanvin @ Oct 19 2007, 11:11 AM) *
Parafoils - Genius!


http://www.youtube.com/watch?v=HU2tymr4Rs0

Their plan is, hopefully, to do exactly that - have the payload fly home again. Not a simple problem however. As you can see, getting it to fly straight is non trivial.

Doug
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AndyG
post Oct 19 2007, 02:06 PM
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I thought the parafoil's quote came from James burrowing into your videos, Doug. I mean we are all sat watching Gizmo, like myself, aren't we? laugh.gif

Andy
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jamescanvin
post Oct 19 2007, 02:34 PM
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Actually my comment did come from Doug talking about it in the first video.

But I admit, I did then go, "Oooh Doug has some more videos" and watched parafoil tests and Gizmo. smile.gif


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djellison
post Oct 19 2007, 04:11 PM
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Gizmo may well be involved in the final part of the trilogy smile.gif If she'll sit still.

Doug
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lyford
post Oct 19 2007, 06:19 PM
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I am assuming that since this is UMSF we don't have to worry about Doug posting a video of him trying this concept vehicle:

Balloon Flight

And I must protest that my UMSF addiction is now spilling over in to my YouTube addiction - Phobos-Grunt updates AND dogs on skateboards?!?!?! Where do I sign!


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djellison
post Oct 19 2007, 11:00 PM
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Part the Third
http://uk.youtube.com/watch?v=U0IJM5EWu9Q
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ElkGroveDan
post Oct 20 2007, 01:56 AM
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Does the data from the GPS device include ALTITUDE? If not, shouldn't some kind of altimeter/barometer be included?

(The shed looks smaller than it did in the original wide angle photos)


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