Re: [nbos] [AS] Travel TimesAlan Bartholet Sat Aug 29th, 2009Hello Anthony, You are correct I missed the part about this being for interstellar travel, I was thinking Interplanetary. I should really be in bed right now ;) Best Regards, Alan Bartholet On Fri, Aug 28, 2009 at 11:41 PM, Antony Farrell wrote: > Actually things are going to get a lot more complicated because with a drive > capable of sustained acceleration you are going to run into lightspeed > problems or out of Newtonian physics. > > Personally I would set a maximum velocity, say 0.1 times the speed of > light, ignore the aceeleration and deceleration times since they will be > largely insignificant compared to the overall journey. So from Sol to Alpha > Centauri about 43 years, to 61 Cygni at about 11.3 light years distance > around 113 years etc. Constant acceleration builds up fast so would as I > said not add a great deal of transit time. > > Antony > >> -----Original Message----- >> From: nbossoftware-bounces-at-nbos.com >> [mailto:nbossoftware-bounces-at-nbos.com] On Behalf Of Alan Bartholet >> Sent: Saturday, 29 August 2009 1:16 PM >> To: nbossoftware-at-nbos.com >> Subject: Re: [nbos] [AS] Travel Times >> >> >> Hello Doug, >>    If you are using some form of reactionless thrust drive, >> allowing for continuous acceleration, then you can calculate >> the travel time with the following formula: >> >> T = 68 * [square root of [D/A]) >> ------------------------------------------- >> T  = time in hours >> D = distance in AU. >> A = spacecraft's acceleration in G. >> >> If your using a reaction drive then things get a little more >> complex. First you need to calculate the time required to >> accelerate to the cursing speed: >> >> T = dV * 0.0455/A >> --------------------------- >> T = time in hours. >> dV = the total delta- V required for the acceleration. >> A = the spacecraft's acceleration in G. >> >> It is easiest to assume that the space ship will spend the >> same amount of time deceleration. >> >> Then you need to calculate the distance covered during your >> acceleration to the cursing speed: >> >> cD = T^2 * A * 0.00042 >> -------------------------------- >> cD  = distance travelled in AU during constant acceleration. T = >> acceleration time in hours as previously calculated. A = acceleration >> in G. >> >> It is easiest to assume that distance travelled while >> decelerating is the same. >> >> Then you need to calculate the distance travelled while cursing: >> >> Time spent cruising (days) = (tD - (cD * 2)) * 1076/dV >> --------------------------------------------------------------- >> tD = distance to the destination in astronomical units (AU) cD = >> distance travelled during accelerating (we multiply it by 2 to account >> for decelerating as well). dV  = cruising >> delta- V in mps. >> >> So the total travel time would be: >> >> Total travel time (days) = Time spent cursing (days) + (Time spent >> accelerating/24) >> >> Both of these do not take into account time dilation but >> until you reach around 1/4c the affects are not worth taking >> into account. >> >> I hope this helps. >> >> Best Regards, >>    Alan Bartholet >> >> On Fri, Aug 28, 2009 at 7:38 PM, Doug >> Jessee wrote: >> > Hello, >> > >> > I am trying to figure out some travel times at slower than light. >> > >> > Anyone know of any easy way to compute these times? >> > >> > For example, a sleeper ship that is going from earth to 61 Cygni. >> > Assuming acceleration of 3/4 Gs, I was just trying to >> figure out how >> > long it would take to travel. >> > >> > -Doug Jessee >> > >> > _______________________________________________ >> > Nbossoftware mailing list >> > >> > >> > >> > >> _______________________________________________ >> Nbossoftware mailing list >> >> >> >> No virus found in this incoming message. >> Checked by AVG - http://www.avg.com >> Version: 8.5.409 / Virus Database: 270.13.71/2330 - Release >> Date: 08/28/09 18:10:00 >> > > _______________________________________________ > Nbossoftware mailing list > > > _______________________________________________ Nbossoftware mailing list