Flying some shit with helium...?

[P.addy]

Hey..

Little project I'm doing at the minute, and the internet as always is telling 2 different answers.

I want to lift 1 - 1.5kg of static weight that does not move. I want it to float through my control (wires, poles) but I also want it to ascend up as high as it can. Basically the opposite of free falling Like letting a balloon go, it just fucks off up to the big blue.

Can anyone give me an exact amount of helium that would be required, even better if you can give me that figure in standard party balloon numbers

Everything bar the helium is ordered so its good to go Before you go and say test it, I need to know a decent amount of helium to buy for multiple attempts and working out what I would need for a swarm....

Karma for all helpful ones as always

[Tungtvann]

80-100 balloons (for 1kg). Double that for extreme lifting speed.

[lihp]

around 180balloons for 1.5kg
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[lihp]

You need to remember in the calculations that you need to lift the weight of the balloon and the string also, which I included
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[lihp]

And I reckon around 1500litres of Helium
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[Tungtvann]

What about getting hold of some industrial balloons? Couple of those that can hold hundreds of litres rather than 5 might make it a bit easier!

[Rogerborg]

Yup, ballpark is 1 cubic metre / 1000 litres per kg (assuming standard temperature and pressure, and that you're on earth).

But helium is a strictly limited resource and you're intending to piss it away on a lark?

A real man would use hydrogen. 8% more lift, and what could possibly go wrong?
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[The Artist]

Much better off using a weather balloon. Can be bought on ebay and you will need quite a lot of helium. I was really bored once and was trying to work out how much I would need to lift myself, a chair and some bevvies up to a decent height. I figured I would need some strong rope but this in turn means I needed more helium and it got too expensive to actually do.

[Hetzer]

https://en.wikipedia.org/wiki/Larry_Walters

https://www.express.co.uk/news/weird/51363/Man-flies-garden-chair-tied-to-helium-balloons
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[Tungtvann]

It's pretty expensive stuff now, too. I reckon it might cost a few hundred quid in helium! 'mon Paddy, what ya doin?

[stinkwheel]

Remember if you're intending to go very high, the balloon(s) will expand massively in size as the air pressure decreases.

At 10,000 feet, the air pressure will be roughly 70% of what it is at sea level. Your balloon will increase in size by a third or so

Weather balloons are designed for this.

Anyway. Stop withholding details, this isn't a military procurement exercise where you tell people what you want them to supply but not what it's for because that's how you end up with avionics systems that don't physically fit inside your helicopters.

Tell us what you're trying to do.

For rapidly elevating a single payload of 1.5kg directly up very quickly, have you considered a rocket? Or a catapault? Or an air cannon?
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[P.addy]

It is a HD recording device with GPS and stuff. Further things would be controlling the device and making it follow a paired device.

For example, suspended item pairs with my phone. It follows me if I walk backwards. Not exactly its use, but I'm aiming for that to be its primary function.

Firstly, I need to get it in the air as high as it can go and work from that. I'd try alternatives to helium, but I know of none. It also needs to be fairly stable from the initial lift and I need to be able to roughly control its descent to not smash the poor thing to bits.

Example, its similar to a Parrot Drone 2.0 but controlled differently and has a Pi onboard for the GPS/Bluetooth stuff to work.

[Tungtvann]

When you say follow, do you mean the camera following your movement? Will it always have to be tethered and how high do you actually want it to go?

[CaNsA]

[Aff]

I recently read an article in Popular Mechanics about 2 MIT students that did this. I'll go and find it and see what it said.
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[P.addy]

[DrDonnyBrago]

True story: I balloon launched a Scotch egg (back to Scotchland) at my niece's birthday party last week.


You flying a camera or something?

EDIT: NM, read the posts between me opening the thread and me posting a reply.

[P.addy]

[Aff]

OK found it.

[Tungtvann]

Fuck the feds, do it anyway. Can I come and watch?

[P.addy]

Oooh helpful

I doubt it will cause any disruptions to others as I'm not likely to exceed 200ft for my initial ascension. I'll on'y be flying it up 20 or so times before confirming my things work or it has failed, then I'll rethink the whole thing

[DrDonnyBrago]

[P.addy]

For the initial stuff I have a solid link to the floor/myself so it can't bugger off, that would make me cry I'll be able to retract it and do walk around testing etc.

[DrDonnyBrago]

What are you eventually trying to doing with it, make something to follow you around with a camera?

[prawny1]

Sounds like your planning on spying on someone, missus maybe? implant a radio tracker whilst she sleeps and get the balloon to follow her about all day.

I hope you have a long bit of string for your range tests so that it doesn't just up and float away.

Are all your fans and stuff for controlling direction strong enough to counter wind forces? 180 balloons will have an awful big surface area.
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