Mystery of the CO2 Balloons!

Filled some balloons w  co2  from dry ice in a soda bottle.   As expected, they act like a lens, a magnifier of sound. No mystery there. Just as a dense glass refracts light, the denser gas refracts sound. The mystery is why balloons filled with co2  leak down faster than identical balloons filled by mouth. Yes, there is some co2 in my exhaled breath, but it is mostly  n2,  and  o2.  I would hav expected the n2 and o2 to leak out more quickly, being smaller molecules. So whatzup wit dat?

Topic by Toga_Dan   |  last reply


High Altitude Balloon

Hello guys, I have recently started working on a high altitude balloon project. I am planing on making a balloon that will go up to 100k ft and while it is travailing up to that altitude it will be snapping pictures and taking videos of the sky.  I am publishing all the updates related to this project on a project dedicated website www.AggieSpaceProgram.com . However after i am done i will be also making a very deatailed instructable on it so others may fallow in my foot steps. I just wanted to share my project with the instructables community, L4I

Topic by looking4ideas   |  last reply


My Space Balloon

Hello everyone, I'm robotkid249, and you've probably seen my Wireless Power instructable. http://tinyurl.com/dh8wfa I've been working on a new project for the last 6 months on sending a weather balloon up to 95,000 feet to take pictures. We're launching in a couple of weeks. If you'd like to follow the project, you should go over to http://stratohab.blogspot.com Tell me what you think. Everything is stil in research and development. Check the blog often for updates. Comment below if you have something to add.

Topic by robotkid249   |  last reply


Whats in a LOCOMOTIVE Balloon Smokestack?

Is it just a screen spark arrestor?  Ive been seeking unsuccessfully for a cutaway diagram.

Topic by Toga_Dan   |  last reply


How to make Balloon Beach Tires

Has anyone made Sand tires for soft sand .. to move boat to the water ? .. weight capacity =500 lbs.

Topic by ~Frog~   |  last reply


How do I make custom balloon art? (Not balloon animals)

Hi I was interested in making balloons in different shapes. Similar in make to beach toys or those inflatable chairs. I'm having trouble finding information on how to make them from scratch. I'm assuming they're made of vinyl sheets but I'm not sure of the method to cut and connect them together, or where to obtain those air valves common on all inflatable balloons. Any information would be great. Thanks!

Question by redyellow   |  last reply


Failed Experimentation : Trash bags solar balloon

.Solar balloon made with 20 litres trash bags don't take flight.It's too small and too heavy ...Don't even try : it does not work =o)(go here instead)

Topic by chooseausername   |  last reply


How do I get a solid balloon shape? Using a 3 Foot diameter latex balloon, need to fill with a solid, smooth material?

First:  Thank You Already for Considering helping me. I need the shape of the Inside of the balloon - not the outside like papermache'. I tried Canned Foam Insulation "Great Stuff" brand; but it didn't expand and solidify.  Then I need to cut it in half to get a hemi-sphere / hemi-balloon shape.  A shape like half an egg, but 30" long, 19" wide, and 9" deep if laid on the flat side. Will Gorrilla Glue puff up and stretch out the balloon?  Is there some kind of expanding urethane that doesn't need free air to cure? Will a rubber mold making liquid like Vytaflex fill a balloon to it's "real shape" and cure inside without air?  http://www.youtube.com/v/MJ9lgZ3V90o&autoplay;=1 is a video of making a sink mold from an existing vessel sink.  But I don't have an original of this shape to make a copy of. Ice isn't permanent enough, but would be the perfect slick surface texture.  I don't have the tools to cut a 30x19" sphereoid in half neatly. The goal is to get a solid shape with a smooth surface to use as a mold for pouring material over to achieve a "bowl" shape with a very smooth interior surface and a hand formed outer surface. thanks again

Question by rubyintherough   |  last reply


Rockoon Project

I've seen many high altitude balloon projects and many rocketry projects on the web.  These seem to be pretty established hobbies. The I got to wondering if anyone out there had ever heard of any amateur rockoon projects? If you haven't heard of a rockoon, it is a combination of the word "rocket" and "balloon".  The concept is that a balloon is used to tow a rocket to a high altitude and then lauched. When I've searched around, most of the references I find are to the use of rockoons by Van Allen (of radiation belt fame)in the course of his research back in the 1950's.  The only thing close to anything like an amateur attempt that I found on the web was by a group called JP Aerospace back in the 90's. I'm not necessarily contemplating any such project myself, I just find it a fascinating possiblity.   And like the many amateur high altitude balloon lauches and high power rocketry, it is amazing what people put together.  I wonder if it would be feasible for a high altitude balloon plus high powered model rocket to ever technically reach the internationally recognized altitude of ~100km considered "outer space". I know that both high altitude balloons and high powered rocketry have their own FAA (or equivalent agency) approval hoops to jump through. Perhaps they just wouldn't allow it, or it would be so much red tape that no one attempts it. Even a low altitude rockoon, of a small ~3ft diameter weather balloon towing a standard model rocket would be an interesting project, for the technical challenge of pulling it off successfully. Anyway, if anyone has ever heard of amateur rockoon attempts or your own musings on the topic, I'd be interested in hearing about it!

Topic by LargeMouthBass   |  last reply


what are the different grades of helium?

How do the different grades affect lift capacity?

Question by glnpar   |  last reply


How to produce 14,000 cubic feet of hydrogen? Answered

Okay, here is the deal. Me and a friend where thinking about filling two weather balloons( http://www.ebay.com/itm/GIANT-Weather-Balloon-Meteorological-Military-8-Dia-/330626487344?pt=LH_DefaultDomain_0&hash=item4cfadfd430) with a lifting gas, sending it up with a camera and gps-cellphone. Now, we have everything else figured out but how to get hydrogen, as it is the lightest gas. Is there any way to produce those quantities of hydrogen within a 6-36 hours? I figure I'd ask here because there are quite a few hydrogen powered vehicles here.

Question by bretta   |  last reply


Tetrahedron Antenna

Hello I have a question about an idea I have for an antenna that always points to the sky antenna no matter how it lands; this is for a high altitude balloon. My idea was to make an antenna the shape of a tetrahedron, so that one antenna always points up. Does  having 4 antennas diminish the signal from the transmitter at all? Thank you

Topic by sdtacoma   |  last reply


Surgical Tubing? Answered

Does anyone know a place local (Target, Walmart, Home Depot) where I can buy this, or a water balloon slingshot? Please help and fast, I need this by tomorrow!

Question by KnexFreak360   |  last reply


question about floating things on SF6 or any other gas

Hey guys, I have this burning desire to float something on SF6. Rather than just balloons or foil boat. Right now i am thinking about dandelions seeds, dust bunnies? dead insects? is there any way for these things to float on SF6? or any other gas? In addition, if i use a balloon full of air, how long can it stay up before going back down? if i seal the fish tank up really good, can i keep it up for a good amount of time? Please let me know what you guys think! Thank you so much!

Topic by haoishao   |  last reply


Flexible & Cuttable Solar Cells

Hi everyone,  I found this video about Flexible and Cuttable Solar Cells:  https://www.youtube.com/watch?v=4SJuIl-gd8g Does anyone have experience with them? I would like to do some energy collector balloon with them. Cheers!! 

Topic by poldarko 


How can I make a hollow, see-through sphere? Answered

This is for an adaptation of a lamp. What I want is to cover the bulb with a large (little smaller than a basketball) sphere, so there will be a hole in one end. Light obviously needs to be able to shine through. My first thought was a resin of some sort, and a quick search led me to epoxy resin. Is this see-through? Can colour be added? Any other ideas? Some early thoughts: - In an inflated balloon, inject liquid. Rotate, thereby distributing fairly evenly, until liquid hardens. Cons: How long do I have to rotate this balloon? What if it pops!? (Could use a hard container...) - Double boiler: Use two similar bowls, small inside larger, fill in between. Cons: How to get it even? Smaller bowl would float (weigh it down...) Not even close to a sphere With your suggestions I'll do a few trials, possibly put out an instructable if something works. All suggestions are welcome (even if they deviate a little). Thanks!

Question by funkrack   |  last reply


Polyurethane Film Supplier?

I am wondering if anyone knows a polyurethane film supplier (the smallest micron possible) that sells to people who only need small amounts, the current suppliers I have found only take in big orders. EDIT: Location - Melbourne, Australia Application - Balloon Material Size of order - 10 rolls of at least 1m by 15m Budget - Maybe around $400 AUD, but I am flexible

Question by Narwhal60091   |  last reply


Has anyone seen and have an opinion on the tv show Through the Wormhole with Morgan Freeman?

Specifically, when I watch the show, I end up with more questions then are being answered.  Today, he was speaking of the Big Bang, and the many theories involved lately.  He stated that the uniformity of the universe seems odd coming from an explosion that could only produce a random pattern. Then this was illustrated by dropping a balloon full of paint onto a canvas.   WHAT?  The balloon itself would disturb the distribution of the paint so that was not a very good illustration.  If they could drop a "round bulk drop" of paint with no "containers" around it, into a vacuum onto a canvas; and if the same thing happened, I'd be more convinced that one "needs" inflation to make things uniform (I am not arguing against inflation theory, but rather that it is needed for uniformity).  This is merely one example of the many questions I came up with in the first 20 minutes of the one hour show. I had to shut it off...at least for now to stop the explosion of things going through my head.  Any thoughts and ideas and concerns are welcome.  Here is the show....       

Topic by Goodhart   |  last reply


Pedal-powered airship gets half way...

A French amateur pilot's attempt to be the first to cross the channel on a pedal-propelled airship has failed.Stephane Rousson, 39, from Nice, took off from Hythe on the Kent coast at about 0800 BST and was half-way to the French coast by 1300 BST.But he was hampered by a change in the wind direction and called off the trip 11 miles from Wissant in France.Mr Rousson said: "I'm not disappointed. I feel happy because it had nothing to do with any technical failure."During the challenge, Mr Rousson was suspended underneath the balloon envelope in a carbon fibre gondola, powering the two propellers with his feet using a bicycle-like contraption. The most amusing thing about the whole trip is the safety system:Just in case Rousson found himself flying irretrievably high, he hung an open penknife from the gondola framework, with the intention of popping the balloon and heading for a splashdown.Sorry, that's the second most amusing thing. The most amusing thing is the pilot's childhood inspiration - ET.BBC article

Topic by Kiteman   |  last reply


Ancient History: Kite bombs

From the article:   We investigate the kite bömb - a never before built medieval siege weapön that dropped bómbs from a kite over cities. We build one and test it with startling new insights and success. We investigate ancient bouncing bõmbs that actually skip across water - ... Source of article.    I saw this on the Ancient Discoveries. Over the weekend I believe, on TV.   The key to stability was a long tail...... Here is a source of information given to me by Kiteman,  concerning the Ancient Kite Bómbs (arial attacks before the airplane or balloon).      

Topic by Goodhart   |  last reply


Checking Theories

In this topic, place your theories of some chemistry experiments in the comments section, starting with this one. To start with, Fe + 2H2O --> FeO2 + 2H...Place iron fillings to fill 1/3 of a water bottle. Fill the rest with water, and place a balloon on top. Wait X days/weeks/months. The water reacts with the iron to extract the oxygen from the water, leaving only hydrogen, and rust in the products. In the reactants, the hydrogen was bonded to the oxygen.Will someone tell me if this works? The energy that bonds this is the potential energy in the water.

Topic by PKTraceur   |  last reply


Observing "weather" (stratospheric temp.) with cosmic rays

An article in New Scientist reports on an analysis of cosmic ray muon data from the MINOS underground detector, which correlates with "sudden" (24-hour timescale) temperature changes in the stratosphere. The original article in Geophysical Research Letters gives you a good flavor for how this kind of analysis is actually done, and written up for publication. The figure below (Figure 3 of the article) shows the beautiful correlation between the temperature (5-day running average in blue) as measured by sounding balloons, and the muon rate in MINOS (also 5-day running average, red band with uncertainties). The alignment of the two curves is obviously not known a priori. The exact numerical calibration between muon counts (red, right scale) and temperature (blue, left scale) is a fitted output of the analysis, not an input.To me, it's just kind of neat that particle physics can relate so sharply to some "real world" large-scale properties.

Topic by kelseymh   |  last reply