I wanted to make a mini blimp
I would look at theGoodyear blimp as an example. It has (as far as I know) two passengers, and a decent control area for them to sit in. My best guess is that it weighs between 800 to 1200 pounds. It looks like the balloon part is around 50 feet long, and 15 feet in diameter. This works out to maybe 2500 cubic feet of helium. So... less than 1000 square feet (10'x10'x10') should lift a man. Of course, getting back down safely is a serious concern. At bare minimum, you should take along winter clothes and a medical oxygen tank and mask, so that you can keep from losing consciousness while in the air if you go too high.
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Actually, look right here: http://www.goodyearblimp.com/faqs/faqs_construction.html
Just a note. The world is running out of readily accessible helium. It is likely that the helium party balloons that we know so well are going to be a thing of the past. Helium gas for TIG welding is amazingly expensive and getting worse by the month.
Just wondering... how much do you weigh? ;)
appx 65 kg.
Yeah, that's what I thought. Don't forget to account for the weight of the balloon and the propulsion system!
have a look at the commercial "toy" blimps to get an idea of size.
is an example of just the mylar envelope. 52" x 27"
In a very simplified rounded off swag using assumptions it takes approximately 0.16kg helium to lift 1kg assuming they are at the same temperature and so on and so forth. So you can do the math. Or just google "lifting power of helium" and do some research.
A kilogram of helium displaces many more kilograms of the air it displaces. Exactly how much depends on the air composition of where you are which can vary slightly. The generally accepted figure is 160 grams of helium per 1 kg you want to lift, which equals out to 10.4 kilograms of helium to displace the amount of air needed to lift your blimp's load. You will probably want a bit extra in order to ensure it floats.