Monthly Archives: June 2010

RS-68 Ares

guest blogger john hare What if games can be quite entertaining even if not practical. This particular one is what if Griffen had dictated an RS-68 for the Ares? It is existing and has considerably more thrust than the J2S, … Continue reading

Posted in Uncategorized | 8 Comments

Canfield Joint Fixes AG-NEP Vehicle Problems

I told the story of how I had gotten involved with the JSC study of an artificial-gravity/nuclear-electric propulsion (AG-NEP) Mars vehicle study. I came into the study near the end (January 2003) and right before the Columbia disaster. As near … Continue reading

Posted in Uncategorized | 20 Comments

Steve Canfield and his marvellous mechanical joint

In previous posts I’ve mentioned that when I first got to NASA I worked in the Propulsion Research Center, which was a fun place to work because you got to think about and try just about anything you wanted to … Continue reading

Posted in Space Tethers | 17 Comments

How I Got Interested in Artificial-Gravity NEP

In several posts now, I have criticized the use of nuclear thermal rocket (NTR) engines. In the case of Earth departure stages, I have shown through mathematical analysis that they either do not have a performance improvement over chemical engines … Continue reading

Posted in Uncategorized | 20 Comments

SSTO is a bad idea, but NTR SSTO is worse

A few months ago, I spent some time describing some calculations of payload fraction that I derived to assist in the design of rocket vehicles. My motivation for getting into this type of work came about from my work on … Continue reading

Posted in Rocket Design Theory | 37 Comments

VTVLs as RTLS Boosters

guest blogger john hare The increasing tempo of VTVL development flights and the recent success of the Falcon 9 lead to possibilities for a different type of cooperative venture. Two companies have VTVLs testing  that are pretty much gas-n-go while … Continue reading

Posted in Uncategorized | 13 Comments

A Small Serving of Crow

guest blogger john hare SpaceX nailed the Falcon 9 on the first try. There is enough crow being eaten around the country now that somebody should put out a cookbook. My serving comes from the expressed belief that the opening of … Continue reading

Posted in Uncategorized | 31 Comments