Dec 05, 2016, 07:17 AM
just look at it smokin'
Discussion

# World's Smallest Dirigible Paraglider

Helium is expensive, but it is small...
Any toughts?
 World's Smallest Dirigible (4 min 41 sec)
 Dec 06, 2016, 05:26 PM Go small or go home Cool. I wonder how the size would compare if you substituted a hot air balloon for helium?
 Dec 08, 2016, 03:48 PM Registered User I'd rather just fly a paramotor
 Jan 19, 2017, 08:16 AM Engineering shenanigans So lessee: Noisy - check Susceptible to winds - check Slow as heck - check Steers like a cow - check So how does this really differ from a paramotor in terms of capabilities? Oh yah, it must be the VTOL capability
 Jan 26, 2017, 07:35 AM Suspended Account I've been fascinated by blimps ever since I was a kid.
Aug 31, 2017, 01:28 AM
just look at it smokin'
Quote:
 Originally Posted by ruzam Cool. I wonder how the size would compare if you substituted a hot air balloon for helium?
It would need to be much larger, but hot air is cheap (short term)
Bouyancy is given by the difference of the mass of the balloon fill medium and the displaced air, you can simply calculate this using the densities of air, helium, and hot air, the density of hot air depends on how hot it is, obviously limited by the balloon material, and it will cool down gradually over time, while helium can take you to the edge of space where the balloon pops.
Hydrogen works too btw and can even be home made from water using electricity, it is just flammable and mixed with oxygen it can explode given a spark.

Quote:
 Originally Posted by Electroforge So lessee: Noisy - check Susceptible to winds - check Slow as heck - check Steers like a cow - check So how does this really differ from a paramotor in terms of capabilities? Oh yah, it must be the VTOL capability
This thing consumes nearly nothing, if you are going with the wind of course
Last edited by z-matrix; Aug 31, 2017 at 01:38 AM.