[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: David <David@InterWorld.com>*Subject*: My Two Bits Ain't Worth 1E-15cents*From*: Brian Mansur <bmansur@oc.edu>*Date*: Mon, 26 Feb 96 12:54:00 PST*Cc*: hous0042 <hous0042@maroon.tc.umn.edu>, jim <jim@bogie2.bio.purdue.edu>, Kelly Starks <KellyST@aol.com>, rddesign <rddesign@wolfenet.com>, stevev <stevev@efn.org>, "T.L.G.vanderLinden" <T.L.G.vanderLinden@student.utwente.nl>, zkulpa <zkulpa@zmit1.ippt.gov.pl>*Encoding*: 38 TEXT

Okay, I just realized something about my two bits worth. They ain't worth squat. I ran the numbers for 11GW/ton/s on my portable RPB decelerator idea and came back to the same problem that Kelly has with his Explorer design. We need too stinkin much power. Assuming 11GW/ton/s to accelerate a measly .036 g and using a De + 3He reaction that yields 3.606E14 Watts/kg and applying that over the time it takes to accelerate to 1/3c at .036 g the numbers got supremely ugly in terms of fusion fuel weight. Back to the drawing board. Perhaps the launcher idea could still work with the Explorer design. What we have to do turn the Asimov into its own fuel launcher. Have the ship rail gun launch most to all of the ship's reaction mass behind it. The particles will have to be at least fast enough to cover a .25 ly track in the time it takes to cruise to Tau Ceti (if we could keep the track together over that amount of time and distance, would it be easier to launch the track from Earth?). As the Asimov begins its deceleration phase, the relatively faster moving reaction mass track slams back into the ship. We ionize the RM and run it through the accelerator for thrust just as if it were interstellar medium. A downside to this idea is the drag caused by hitting the really fast particles at the end of the deceleration run. Also there are going to be serious power cost to launch the track. Kevin's 11.5 ly long power cord is looking better all the time. Since we'll have to carry so much reaction mass for the launch track, I suggest we use the E18W we have planned to mag-sail launch the ship. So I guess we launch the track via the ion accelerator using it as a rail gun if that is possible. Someone else had better run the numbers on the drag and power needs. That is if anyone thinks this has a chance of working. If not, please show me the error of my ways.

- Prev by Date:
**<Two bits worth** - Next by Date:
**My Two Bits Ain't Worth 1E-15 (Take 2)** - Prev by thread:
**Re: <Two bits worth** - Next by thread:
**My Two Bits Ain't Worth 1E-15 (Take 2)** - Index(es):