this instucterble is based on ewilhelms most exelent instructerble with a few added benifits.
recomend you do not release it with in the flight path of your local air port coz this baby goes realy high.
and in the right conditions wont come down till the sun is down as once the fuel has gone the sun seems to heat the black plastic enuff to keep it up.

Step 1: bits n peaces u need

beg borrow or steal two of the largest, thinest (crinkly noisey stuff) bin liners you can get, thick plastik may be to heavy.
cut the bottom from one befor compleatly unfolding for straitest cut and tape them together with light packing tape to create the envolope of ballon.
with strips of balsa wood make a large capital letter I shape to fit tightly in mouth of envolope, use pins to hold in place while you adjust for tight fit, remove and glue.
should be an aproxamate sqaure.
put a long needle threw middel of balsa frame with alumium foilglued in place to prevent fire .
couple bits of tape at each corner is enuff to hold envolope in place.
This caught my eye as I was a volunteer crewman for a hot air balloon company last year, but upon reading it, I have several SERIOUS problems with it: 1 - Clearly, no proofreading was done on the text. 2 - Sending several square meters of plastic into the air to come-down "who-knows-where" is a good example of environmental negligence. 3 - The potential liability of using firelighters on an uncontrolled platform makes there use irresponsible. It's so easy to cause a grass, brush, or forest fire which can kill people, destroy property, a produce huge environmental damage.
I have to agree with safety issues addressed in this post....consider tethering the balloon and use the opportunity to teach safety AND Leave No Trace practices to your buddies and the kids with you. (Fire extinguishers were where?) Glad you shared your experiment and methods. Look like you had a great time and hopefully you will take these well intended suggestions as ways to make your next ballooning jaunt safer AND more enjoyable for all.
INSTRUCTABLES it's written all over the place on the site !<br />
good instructable, but take the time to CHECK YOUR SPELLING
Download Firefox and it spellchecks as you go along. Great stuff for dummies like me.
Firefox ROCKS!!!!!&nbsp; <br /> <br /> Let's start the chant.....&nbsp;&nbsp; Firefox!,Firefox!,Firefox!,Firefox!,Firefox!,Firefox!......
yupp; thats what I got :]
how could you set up a small, lightweight GPS system? One that either records coordinates and can be plugged int o a computer, or some sort of lng range wireless streaming. I smell an instructable......
nice. what you could do to be able to pull it down or not loose track of it is attach a fishing pole or kite string to it, so when you want to pull it down you can.
How much weight can it lift? Obviously not a lot, but can you give me an extimate? Furthermore, ignore the snipers. I found this instructable very interesting. I was actually linked here from another site :D
VD calculations (volume density)<br/><br/>Calculations:<br/><br/>V1. = weight of balloon material and load and density of contained or displaced volume of hot air<br/><br/>VS.<br/><br/>V2. = Density of same volume of ambient temperature air<br/><br/>If VD of V1 &lt; V2 - Balloon Rises. (&lt; = less than)<br/><br/>If VD of V1 &gt; V2 - Balloon Sinks. (&gt; = greater than)<br/><br/><a rel="nofollow" href="http://en.wikipedia.org/wiki/Density_of_air">http://en.wikipedia.org/wiki/Density_of_air</a><br/><br/>Temperature and pressure<br/><br/>The density of dry air can be calculated using the ideal gas law, expressed as a function of temperature and pressure:<br/><br/>p' = p / r x t<br/><br/>where &#961;' is the air density, p is absolute pressure, R is the specific gas constant for dry air, and T is absolute temperature.<br/><br/>1 cubic meter of dry air at 20*C = 1.204 Kg<br/><br/>1 cubic meter of dry air at 35*C = 1.146 Kg<br/><br/>15*C temperature rise of air of 1 cubic meter of air = displacement of 58 grams or 0.058 Kg......<br/><br/>Increase air temperature = lowering of air density = greater boyancy of balloon (less weight of air inside given volume of balloon).<br/><br/>Increase volume of balloon = greater boyancy or lift.<br/><br/>The only thing to actually find out is the approximate TEMPERATURE of the air inside a well inflated black plastic bag.<br/><br/>Everything else can then be calculated out - surface area, volume, weight of plastic bag and tape; and if the volume is enough = load lifting as well.<br/>
I can see one of these on mars. Woot! Replace the fire starters with some ammonium nitrate and sugar... so it burns without air... fills the whole thing with hot CO2, releases, and carries a camera aloft for days... without having to carry pressurized hydrogen or helium... suhweet! maybe put a camera or something on it, to record or even transmit home... and maybe a gps logger... that would be awesome!
GPS ain't gonna work on mars. No constellation of satellites whirring overhead there ya know. ;D
*sigh* I know. GPS only works on or near Earth. Specifically, the satellites don't whir, they simply orbit. There's no air up there, so no whirring sound. Not even a swoosh from Nike. Not yet anyhow. There is a constellation of satellites on Mars, however... they all speak the same language, and can distance-find using one another's radio signals. So, it wouldn't be a Garmin system, but you could sure use a GPS like system on Mars. More specifically, this guy who posted the instructable could duct tape a GPS receiver with a data logger to the bottom of the thing, and see how far and where it went... A-La-Radiosonde GPS on mars... bah!
what if we dump soooooo much air into space, we lose the vacum.
If and when we move people to Mars permanently I don't doubt that MPS (Mars Positioning Satellites {I just made that up}) satellites that double as Iridium sat phone type comm sats will be one of the first projects no doubt. Hmm..I could write a SciFi story. OP that is a cool balloon. We made one when I was a kid out of a clear drycleaning bag with candles in it. PD got calls about the UFO.
That eeeeww effffoh flew riiiight over mi howse. Them aalleuns did probing on mi pirate parts. Dat is whii ih cnt smell too good. sorry, couldn't help myself. I actually made consistant "D"s in spelling and grammer in school. The balloon ROCKS though. Nightflight!
true i cant spell, but should spelling ever become the mesure of a man ill go for a gender reasighnment and spend the rest of my days ragging on every one elses lives. as for safety or enviromental isuses it is up to indervidals to make their own choises and or safety tests re: the "not liable" section. do feel free to boost your ego,s over my bad spelling if it is all you have to fight off depresion and suicide. ;-)
The plastic is very concerning. Can clog the guts of marine charismatic macrofauna. I use tissue paper. Works well. Cheers!
Yes, and how long do the fightlighters burn. Do they present a fire hazard if the balloon goes down to soon. But I do like the way you are involved with your kids building something and teaching them these things. I hope they have seen this instructable on the WWW. Keep up the good work. Thanks for sharing.
I had a go at building some of these a few years ago, the fire lighters usually burn out in about 15 miutes, And chasing after the baloon up to that time is a must.

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