Steve Jackson Games - Site Navigation
Home General Info Follow Us Search Illuminator Store Forums What's New Other Games Ogre GURPS Munchkin Our Games: Home

Go Back   Steve Jackson Games Forums > Roleplaying > GURPS

Reply
 
Thread Tools Display Modes
Old 08-14-2011, 08:12 AM   #41
thrash
 
thrash's Avatar
 
Join Date: Aug 2004
Location: traveller
Default Re: TL9 Spaceships

Quote:
Originally Posted by teviet View Post
I haven't read up as much on the M2P2 sail; maybe it can maintain constant acceleration, but it might also need more consumables as it expands.
Acceleration and consumables remain constant; the density of plasma inside the bubble decreases.

The problem I've seen with M2P2 sails is that there is no perpendicular component to the acceleration -- it is all radially outward, or whatever direction the local plasma wind is flowing in the vicinity of planets. Interplanetary trajectories involve long periods of coasting with the drive shut off, waiting for gravity to turn you in the direction you need to accelerate or decelerate.

So, for example, an Earth-Jupiter run starts with a long "burn" onto a very eccentric transfer orbit. You then coast to an aphelion 'way beyond Jupiter. As you turn inbound, you make another long "burn" to decelerate. The voyage ends with a stop against Jupiter's magnetotail.

A practical M2P2 ship at TL9 probably has an auxiliary propulsion system (VASIMR or some such) for maneuvering near planets and expanding the available trajectories. The combination of plasma sail + fusion drive + fuel tanks is still probably more efficient than an all-fusion system at that TL.
thrash is offline   Reply With Quote
Reply

Tags
magsail, spaceships, tl9

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Fnords are Off
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 11:34 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.