Re: space elevators untra ultralight materials
Robin van Spaandonk wrote: In reply to Wesley Bruce's message of Sat, 08 Oct 2005 15:19:41 +1000: Hi, [snip] A key to space elevators, solar chimney technologies and big flying jet stream windmills is *zero weight building materials*. I have a design for such a material; an expanded foam filled with hydrogen and helium. Its meant to be Buoyant up to 5 km and ultralight but stiff above that hight. IOW it would be buoyant for the first 0.01% of the distance. Your probably correct. I'll settle for a thousand meters. That would make it 0.002 %. In short, this measure is useless. Not quite the bottom few kilometers would need to be alittle stifer than the rest of the cable. Winds at higher altitudes are not a problem on the equater but at ground level a few precautions are advisable. For the other application, solar chimneys 1000 meters will do fine. For aerospace taking any weight off helps heaps. Regards, Robin van Spaandonk In a town full of candlestick makers, everyone lives in the light, In a town full of thieves, there is only one candle, and everyone lives in the night.
Re: space elevators untra ultralight materials
--- Wesley Bruce [EMAIL PROTECTED] wrote: Not quite the bottom few kilometers would need to be alittle stifer than the rest of the cable. Winds at higher altitudes are not a problem on the equater but at ground level a few precautions are advisable. For the other application, solar chimneys 1000 meters will do fine. For aerospace taking any weight off helps heaps. What would happen if you had a balloon ballasted to float over the weather, with a cable dangling down to take the weight of the solar chimney? Would the winds under the weather make it useless, or could they be kept under control? For that matter, could the movement of the cable be translated into work of some kind? __ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/
Re: space elevators untra ultralight materials
On Saturday 08 October 2005 17:21, Rhong Dhong wrote: --- Wesley Bruce [EMAIL PROTECTED] wrote: Not quite the bottom few kilometers would need to be alittle stifer than the rest of the cable. Winds at higher altitudes are not a problem on the equater but at ground level a few precautions are advisable. For the other application, solar chimneys 1000 meters will do fine. For aerospace taking any weight off helps heaps. What would happen if you had a balloon ballasted to float over the weather, with a cable dangling down to take the weight of the solar chimney? Would the winds under the weather make it useless, or could they be kept under control? For that matter, could the movement of the cable be translated into work of some kind? Mr Dhong, For your info, there is a website published by a company seeking to do just as you propose-- send a 'balloon to space. It is called JP Aerospace and their website is: jpairospace.com They bill it as 'America's other space program. It is quite a radical program. They are working on materials light enough and strong enough to facilitate a two stage system of space travel. First is an ascender, a very large semi-rigid derigible type maybe a thousand feet long and shaped in a 'V'. This will carry passengers and maybe some tons of cargo to an altitude of about 200,000 feet, just on the edge of the atmosphere and the end of buoyancy for derigible type objects. It is here that crew and cargo will transfer to another semi-rigid derigible in stationary hover. That they call their 'dark sky station'. It, according to their PDF, will be about a mile and a quarter in diameter and look like a giant asterisk. This is the lower space port for the spacer. The spacer will be about 6000 feet long and again look like a 'V'. It will be fitted with solar electric thrusters. Its job will be to pick up its cargo and passengers and then embark on a long spiral path much like the European Space Agencie's SMART-1 and use its solar thrusters and a small amount of the gas in the ascender to gradually pick up speed and achieve orbital velocity. By the time it has gotten to 30,000 miles altitude it will dock again with another space station, a rigid and shielded one this time, and deposit its cargo and passengers. After taking on cargo and passengers for the return to earth, it will reverse the process. The point is that all this will be done vrry swwlly...but safely. Not having an atmosphere to give wind problems, it will not have to be very rigid, and its large surface area for amorphous solar cells will give it very high power for its electric thrusters. Right now it has a contract with the government for proof of concept prototypes. Some of the Vortexians, I am sure, know of this. Standing Bear Hey, I do not care if we have to build an Orion, any way we can get back and forth cheaply and safely to space I am for. And I DO want to see this done before I die.
Re: space elevators untra ultralight materials
In reply to Wesley Bruce's message of Sat, 08 Oct 2005 13:16:29 +1000: Hi, [snip] A key to space elevators, solar chimney technologies and big flying jet stream windmills is *zero weight building materials*. I have a design for such a material; an expanded foam filled with hydrogen and helium. Its meant to be Buoyant up to 5 km and ultralight but stiff above that hight. IOW it would be buoyant for the first 0.01% of the distance. Regards, Robin van Spaandonk In a town full of candlestick makers, everyone lives in the light, In a town full of thieves, there is only one candle, and everyone lives in the night.
Re: space elevators untra ultralight materials
Robin van Spaandonk wrote: In reply to Wesley Bruce's message of Sat, 08 Oct 2005 13:16:29 +1000: Hi, [snip] A key to space elevators, solar chimney technologies and big flying jet stream windmills is *zero weight building materials*. I have a design for such a material; an expanded foam filled with hydrogen and helium. Its meant to be Buoyant up to 5 km and ultralight but stiff above that hight. IOW it would be buoyant for the first 0.01% of the distance. Your probably correct. I'll settle for a thousand meters. Regards, Robin van Spaandonk In a town full of candlestick makers, everyone lives in the light, In a town full of thieves, there is only one candle, and everyone lives in the night.
Re: space elevators untra ultralight materials
In reply to Wesley Bruce's message of Sat, 08 Oct 2005 15:19:41 +1000: Hi, [snip] A key to space elevators, solar chimney technologies and big flying jet stream windmills is *zero weight building materials*. I have a design for such a material; an expanded foam filled with hydrogen and helium. Its meant to be Buoyant up to 5 km and ultralight but stiff above that hight. IOW it would be buoyant for the first 0.01% of the distance. Your probably correct. I'll settle for a thousand meters. That would make it 0.002 %. In short, this measure is useless. Regards, Robin van Spaandonk In a town full of candlestick makers, everyone lives in the light, In a town full of thieves, there is only one candle, and everyone lives in the night.
