According to the mission that will fulfill our balloon we will have two types of basket
NOTE: The two missions explained here below are NOT related to the balloon designed before, but are generic for all the helium balloons. You'll have to adapt according to your needs and decide on which of the two proposals roads you wish to continue, or if you follow another all yours.
- Travel the maximum distance from takeoff to landing.
This type of mission is the most simple and cheap that we can do with a helium balloon.
First it will serve as the basket, a container made of polystyrene, or we can build it starting from sheets of the same material. It is best done drilled in more points so that you can easily see inside
Outside, we will have to write a readable and clear message both on the lid and on the sides: OPEN ME!!
Inside we put a PLASTIFIED sheet with the following written, obviously changed by you at will:
Hello! You're the lucky discoverer of this fallen helium balloon that traveled for days in the stratosphere! Help us complete our experiment, you only need to send us an email with a balloon photo and the coordinates of the place where you found the balloon at this address: "Your-Address ......... @ .com/other" and how thanksgiving will receive 15 €/$ on paypal account that'll let us know!
Ciao! Sei il fortunato scopritore di questo pallone sonda precipitato che ha viaggiato per giorni nella stratosfera! Aiutaci a completare il nostro esperimento, devi solamente inviarci una foto del pallone e le coordinate del posto in cui lo hai trovato a questo indirizzo: "Il-Tuo-Indirizzo@......... .com/altro" e come ringraziamento riceverai 15 €/$ sul conto paypal che ci comunicherai!
In this way, with pay/reward only 15 €/$ we will know where it came, without losing expensive equipment and without having to complicate life in strange ways! Write your message in two languages is necessary because the ball could travel thousands of kilometers!! 😀
Given that for this mission you will use a light basket is not necessary parachute, we will connect simply with a cord to envelope. Will be the envelope itself that slowly deflating, will gently down the polystyrene basket to the ground without damage.
To ensure that the balloon does not explode due to the height reached, for this mission we will leave open the hole that we will use to fill with the helium the balloon so that it may compensate the pressure differences without bursting.
An advice to you to help you achieve the maximum distance is to run the ball 20 minutes after sunset on a calm evening, this to delay the balloon meeting with harmful solar rays that will damage the thin envelope and we will lose a bit of helium due to the expansion due to their heat. 😉
Here you can see the launch video of my M3 balloon, 8 cubic meters, designed to reach 27,000 m
- High-altitude video.
- Retrieval of video and GPS instrumentation.
- Low flight time to prevent an excessive distancing from the point of launch.
In a mission of this type the basket will be equipped with parachute to prevent it from crashing to the ground, thus destroying its sophisticated content and causing damage to other property.
The payload that we will use on a mission of this type, will be camera and GPS.
it is essential that it is constructed of polystyrene and that it is closed, cause at 20'000 m the temperature is about -50 ° C. The closure should NOT be tight but must have a pair of 1 mm diameter holes on the sides, otherwise due to the significant reduction of pressure that will meet going up, it will be damaged irreparably, with the likelihood of losing all the content.
To build it, you can use some polystyrene packaging ready-made or build one yourelf with the same material sheets.
Inside as there are electronic devices we must also provide one or two chemical hand warmers, otherwise the batteries will give up quickly with the cold.
NOTE: The warmers coal are NOT appropriate, this is because in addition to the risk of ignite something, it would turn off with increasing height due to a lack of oxygen.
Camera and GPS if possible will be placed in the high part of the basket, because in this way at the impact on the ground (after flight) they will find below the soft material (padding and warmers)
Another very important thing is cover with plexiglass or something similar the hole made for the camera, which otherwise would rapidly cool the interior of the basket.
When its construction is finished, before closing the gondola, fill it with a Styrofoam pieces or crumpled paper (NOT pressed, only crumpled) to insulate better.
The basket will now be attached to a parachute by a strong swivel, which will avoid the twisting of the wires of the same.
The parachute can we build with cellophane or nylon, but since it does not have to withstand great breaking load, cause start already open, I recommend the cellophane.
Of course the parachute should be dimensioned according to the weight that must lead, then never to make strange calculations i will give you the standard size based on weight.
From 100 to 500 grams begin with a diameter of 50 cm and add 10 cm per 100 grams.
500 g to 2 kg, begin with a diameter of 1.5 m and add 10 cm for every 100 gr
If you decided to use cellophane, use reinforced tape to attach the ropes to the parachute, and secure the apex of the parachute to a final rope that will be attached to the underside of the balloon.
For this mission is important that once you have filled with the right amount of helium (we will see later how to dose) the balloon, you close it with tape, making sure that does not leak. In this way when it reaches the maximum height will explode and will return to the ground completing his mission. Equally important it is to throw the balloon in the morning, so as to exploit the daylight hours of the day. 🙂
As for the balloons, it is very important to choose a day without wind. Especially during the liftoff phase.
However, this condition is rarely occur during the day, and usually the best time is early morning.
Before filling the balloon with helium, let's make sure to push out air by compacting the casing, but at the same time being careful not to abuse him too much.
As determined during the design phase, we will need for this ball 3 cubic m of helium, if it will be less if we risk to not being able to lift up to 2 kg of payload established, it will be more the ball will explode prematurely at a lower level.
To know how to obtain, with a good accuracy 3 m cubic needed helium, we must know how much volume the (helium) bottles that we will use had, their internal pressure, and multiply together the two parameters.
Example: 10 liters can ( l ) at a pressure of 100 atmospheres ( atm )
10 x 100 = 1000 l = 1 cubic m
So if we have can as the previous example, we should use 3 for obtai 3 cubic m needed
Now that we know how to behave with the amount of helium, we can open the hole that we left during construction and with a tube, start filling with helium.
Be careful not to over-open the helium valve, otherwise the high flow irreparably harm the delicate envelope.
If we have decided to do the first mission first, I recommend you to connect the cord to the envelope with the tape when the inflation hose is still attached, so that taking the shape of the tube, the hole remains open which will then bleed the excess helium and prevent rupture.
If you have decided for the mission 2, we will fix the connection string to envelope after filling with helium the balloon (making sure it does not fly away), to close the fill hole and make sure that the balloon will explode, so we can recovery of the basket.
Well I think it's all over, if you have questions feel free to ask through the page About Me!