Questions on calculating material needed for lifting object

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SUMMARY

This discussion focuses on calculating the minimum amount of gas required for a floating sentry bot using Helium or a mixture of Ammonia. The key formula for buoyancy is established as Buoyancy Force = Density * Volmin * g, where g represents gravitational acceleration. The relationship between gravitational potential energy and weight is clarified with the equation Eg = Wgas. The conversation emphasizes the need for active control mechanisms to maintain altitude, especially for low heights where the bot's behavior is binary—either it rises or remains grounded.

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  • Understanding of buoyancy principles
  • Familiarity with gas properties, specifically Helium and Ammonia
  • Basic knowledge of gravitational potential energy
  • Concept of active control systems for altitude maintenance
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DarkMage64
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I am trying to make a floating sentry bot ; though, my plan was to use Helium or with a mixture of Ammonia. I want to find the minimum amount of gas in a balloon require to reach the max height the object should float. I know the buoyancy force is Density * Volmin * g : where the maximum potential energy of gravity is W*Hmax. I'm not sure if I am correct, but I would have to equate the Eg = Wgas correct?
 
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For low heights, there is no relevant max height - either the thing will rise, or it will stay on the ground. You probably need some active control to keep it on the same height.

I know the buoyancy force is Density * Volmin * g
Right, and all three values are nearly height-independent for the first ~100m. The same is true for the weight of your bot, its weight is either below or above that value.
 

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