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<skaran-at-bordernet.com.au> 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<ldjessee-at-gmail.com> 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