![]() Our Weather Balloon Inflator kit includes a launch scale which you can use to measure the weight of your particular payload setup. For this tutorial we'll use our 600 g Weather Balloon and our Eagle Pro Kit which weighs ~ 600 g (including batteries, a GoPro, parachute, Radio Bug, etc.). Because we're not sure how much positive lift we need yet we'll just enter 100 g for now. Select your balloon size from the drop down menu and input your payload weight (everything suspended below the balloon including parachute, rigging, cameras, etc.). Step 1 - Input your balloon size, payload weight, and positive lift of 100 g into the calculator. If you launch two payloads with the same size balloon, the balloon with the least amount of helium will burst at the higher altitude.The larger the balloon size (the more it weighs), the larger its diameter/volume will be before it bursts.A 1200 g weather balloon weighs ~ 1200 grams. A 350 g weather balloon weighs ~ 350 grams. Balloon sizes are measured by their weight in grams.More expensive balloons have a greater burst diameter/volume than those made by a cheaper manufacturer. Two identical size balloons made by the same manufacturer will typically burst at the same diameter/volume.We want our customers to be pleased with their achieved altitude and not be disappointed because they never reached a theoretical altitude generated by our calculator. Our Balloon Performance Calculator is conservative when calculating predicted burst altitude.The more positive lift you have, the faster your payload will climb. The more helium you add to your balloon in addition to the helium used to lift the weight of the payload and the balloon itself, the more positive lift you will have. The lift force created by this additional helium is called positive lift. This additional helium will provide the extra lift you need to make your balloon climb. The easiest solution is to add more helium to the balloon. You need a force that will make the balloon and payload rise upward. This is because your balloon has only enough helium to lift its own weight and the weight of the payload. It just floats right in front of you, neither climbing nor descending. to get the total number of cubic feet of helium required for your launch (2400 g รท 28 g/cu.ft = 86 cu.ft.). You divide the weight of your balloon and payload (2400 g) by 28 g/cu.ft. You calculate how much helium you need to launch your payload with the knowledge that 1 cu.ft. Let's also assume you are using our 1200 g weather balloon (which also weighs 1200 grams). As an example, let's say you want to launch a payload that weighs 1200 grams (including the weight of the parachute, rigging, etc.). Positive lift is the extra lift your weather balloon needs to rise upward in addition to the lift needed to carry the weight of your payload and the weight of the balloon itself. You can always change this number based on the results you get from the calculator. For now just start with an initial guess of 100 grams. Your positive lift in grams - This number will make more sense as you learn how to use our Balloon Performance Calculator.The weight of the payload does NOT include the weight of the balloon. You can use the launch scale included with our Inflation System Kit. The weight of your payload in grams - This is the weight of everything suspended below the balloon including the parachute.The size balloon you intend to use - Our Balloon Performance Calculator works with our 350, 600, and 1200 g balloon sizes. ![]() Keep in mind that this is a conservative estimate only. The smaller the balloon's initial volume, the higher it will go before it reaches its burst volume. and can therefore predict at what altitude the balloon will be when it reaches its maximum volume. It already knows what the initial volume of the balloon is at launch in cu.ft. Next the Balloon Performance Calculator calculates the altitude at which the balloon will burst. helium can conservatively lift 27.82 grams). It then divides this summation by 27.82 to get the amount of helium you need in cubic feet (1 cu.ft. To accomplish this the calculator adds the weight of the balloon, the weight of the payload, and the positive lift. ![]() With these three values, the Balloon Performance Calculator determines exactly how much helium you need. The Balloon Performance Calculator starts by collecting three pieces of information: the size of your weather balloon, your payload's weight, and how much positive lift you want to use. Before you use our Balloon Performance Calculator it is important to us that you understand exactly how it works.
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