In reply to Michel Jullian's message of Sat, 6 Jan 2007 10:27:41 +0100: Hi, [snip] >Aren't photon rockets supposed to be the most efficient of all? > >Michel
Yes, however the thrust is worthless, particularly when considering Earth to space vehicles. Perhaps I should have said "...be far and away the most efficient practical way...". What I was trying to get at, is the fact that it would be far more efficient than going through a conversion process and then using e.g. an ion drive. > >----- Original Message ----- >From: "Robin van Spaandonk" <[EMAIL PROTECTED]> >To: <[email protected]> >Sent: Friday, January 05, 2007 9:46 PM >Subject: Re: [Vo]: Cold fusion powered rockets > > >> In reply to Jed Rothwell's message of Thu, 04 Jan 2007 15:56:22 -0500: >> Hi, >> [snip] >>>None. But suppose only CF is made practical, and the temperature is >>>limited to, say, 1000 deg C. I suppose that would call for a two- or >>>three-stage approach, starting with heat to electricity. >>> >> Not necessarily. It is becoming evident that when CF actually occurs, alpha >> particles are the usual nuclear product. It may become possible to arrange >> for >> them to be ejected directly rather than undergoing any form of conversion at >> all. Multi-MeV alphas would yield a very interesting specific impulse, and >> also >> be far and away the most efficient way of utilizing the fuel. >> >> Regards, >> >> Robin van Spaandonk >> >> http://users.bigpond.net.au/rvanspaa/ >> >> Competition provides the motivation, >> Cooperation provides the means. >> Regards, Robin van Spaandonk http://users.bigpond.net.au/rvanspaa/ Competition provides the motivation, Cooperation provides the means.
