The lift force in aerodynamics for aircraft, birds, and wind turbines arises not primarily from complex and little understood effects at the airfoil surfaces as seems to be held popularly but from the simple deflection of air in large volumes with great mass downwards and can be readily determined physically using nothing more than vector algebra and finding the difference of the flow vector before and after deflection.
2006-08-16 02:10:11 · 5 answers · asked by hrdwarehobbyist 2 in Environment
Approximately 13 (12.4 calculated) metres if the hot air baloon is a sphere!
2006-08-16 02:26:10 · answer #1 · answered by SAREK 3 · 0⤊ 0⤋
The lift produced on the wings of an aircraft is due to the differential pressure between the top wing and the bottom wing: the airflow is separated at the leading edge and rejoin at the trailing edge. The airflow above the wings has a longuer path to follow that the lower one, hence it runs faster, hence the pressure is less than at the bottom (Laws of pressure, Ventury channel etc). This has nothing to do with the ballon, nor anything to do with air masses going downwards. I know: I am a pilot!
As far as your balloon is concerned:
Convert 2000 pounds into a volume, taking account of the pressure of the air inside and its temperature. This will give you the maximum volume of the balloon if it were in space.
Calculate the difference of pressure between inside and outside (here also, depends also of the air temperature, the pressure, the altitude and the humidity contents of the air.
Have fun!
(I am a balloonist too, but I am using tables - much easier!!!)
2006-08-16 09:23:19 · answer #2 · answered by just "JR" 7 · 0⤊ 0⤋
The volume of air in the balloon will depend on teperature and pressure of air in the balloon and space required for that volume of air will be inversely proportional to pressure and directly proportional to temperature.Pressure and temprature will be limted by wall strength of the balloon. The diameter under such unknown conditions of temperature and pressure could be of any of any size.
2006-08-16 11:38:46 · answer #3 · answered by riaz 2 · 1⤊ 0⤋
Depends on the pressure. Obviously it's elevated if it's a hot air ballon. raise in temps cause a raise in pressure which will cause a gas to want to expand.
2006-08-16 11:46:59 · answer #4 · answered by hyperhealer3 4 · 0⤊ 0⤋
2000 pounds divided by the density of air (0.076 pounds per cubic foot) gives 26,300 cubic feet.
Volume of a sphere is 4/3 pi r3 so:
r cubed = 6280
r = 18.45 feet
diameter = 36.9 feet
2006-08-16 09:20:30 · answer #5 · answered by David in Kenai 6 · 0⤊ 0⤋