Home » News & Blogs » Liftport Lunar Tether
Bookmark and Share
Hop's Blog

Liftport Lunar Tether

16 Apr 2016, 20:00 UTC
Liftport Lunar Tether
(200 words excerpt, click title or image to see full post)

This is the fifth in a series of posts using Chris Wolfe's spreadsheet to look at various elevators.274,000 km Lunar TetherThis is based on the Ladder PDF written by Liftport  founder Michael Laine and Marshall Eubanks.Eubanks and Laine suggest the use of Zylon or M5. This is why I've been using Zylon through out these tether posts. These gentlemen have invested a lot of time and effort researching elevators and tethers. If they like Zylon, I'll follow suit.They propose launching the tether to EML1. From EML1, the tether anchor would descend moonward towards Sinus Medii on the lunar surface, 0º, 0º. The spent upper stage would drop with the tether foot earthward.If the mass were tethers alone, the 264,000 length would be inadequate to keep the tether from collapsing to the moon. But spent upper stage acts as a counterweight to maintain tension.Ratios earthside of EML1A spent Centaur upper stage is about 2250 kilograms. This is the quantity I used for foot station mass. These newtons subtract from newtons available for payload. The Ladder PDF calls for 11 tonnes of Zylon. By trial and error I entered payload quantities until tether mass in my spreadsheet came to 11 tonnes.In addition ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod