Can weather balloons lift a person?
The average person in the U.S. (estimated for both males and females of various heights) weighs about 80 kg. Helium can lift approximately 1 gram per liter. Thus, you need approximately 80000 liters of helium to lift said person, or in other words, it would require 80000 / 14 5714 balloons.
At what altitude do weather balloons pop?
Weather balloons can rise to an altitude of 24 miles (39 kilometers) or more before they burst, and a payload may land (via parachute) up to 75 miles (120 km) away, depending on wind conditions at the launch site, Maydell said.
What do you do if you find a weather balloon?
(1) Cut and discard the string to the burst balloon and orange parachute. IMPORTANT: On rare occasions the balloon may be found partially inflated with gas. The gas inside the balloon may be flammable hydrogen. If the balloon is inflated, keep away from it and contact your local fire department for safe disposal.
Why does a hot air balloon stop rising?
Both helium and hot air balloons stop rising because the density of air is decreasing with altitude and, with it, the lifting force. This is not the case with water, which has practically the same density at different depth levels and therefore keeps pushing objects less dense than water all the way up to the surface.
Can a balloon be used as a vertical antenna?
Last month there was a discussion about balloon antennas, mainly about using 2 balloons instead of one for a vertical antenna. Two persons mentioned their concerns after having read articles on the subject relating about wind-induced static shock hazard and reception high noise level.
What kind of balloon is best for tethering?
Several posters noted that kite-shaped balloons designed for tethering work best; the kite shape makes the balloon generate lift in the wind, so that the antenna stays more vertical. Apparently kite-shaped balloons meant for tethering are sold for advertising purposes, to host pennants over sales at car dealerships and such.
Is it safe to use a kite as an antenna?
Using a kite, or balloon, to launch a long-wire antenna is a risky business, even on a clear day with no clouds around. The danger arises from the electric field between the earth and ionosphere. This field is about one hundred volts per meter (in the vertical direction), and is always present.
Do you need a choke coil for a balloon antenna?
Add a choke coil to the antenna connector between centre pin and ground. This will leak away any charge that tries to accumulate. I see that most modern rigs don’t provide a D.C. discharge path from antenna connector to ground – this is dangerous to your equipment.