I found since last entry that my estimates for dv around Mars are really ultra-sensitive to Mars' orbital position. Hence the propellant mass quoted is potentially off the mark. When Mars is at aphelion the dv is about ~ 1 km/s lower than if Mars was at perihelion. Early September 1986 would find Mars at aphelion, but where would Venus be for the sling-by from the novel? Working on it currently. Transfer time is ~ 384 days, meaning a launch in August 1985.
BTW The mission flight-plan from Voyage is an Opposition Class Hohmann transfer. Usually the dip past Venus is on the way back from Mars to reduce the re-entry velocity at Earth. But it works the other way too, it seems.
And I am wondering about the propellant choice - UDMH/N2O4 is very space friendly, but there are other options for fuels and oxidisers out there. Liquid oxygen is the very definition of cryogenic, but keeping it liquified doesn't take a lot of equipment or power, especially if the tank was wrapped in reflective insulation, for example. A mix of RP-1 and LOX has a decent amount of kick, an Isp ~ 353s, but LOX and UDMH can get ~ 363s, which is cool. Definitely better than the N2O4/UDMH mix of Apollo. The mix is a lot denser (0.97 vs 0.28 gm/cc) than the LH2/LOX used in the Saturn IV-B, so if we assume the tanks are lighter, but the cooling system makes up the difference, then the Interplanetary Maneuver Stage (IMS - another TLA) can mass ~ 13.5 tons like the Saturn IV-B + IU combination.
Propellants that have been tried in real rockets can all be found here...
Interesting mix is LH2/LF2 - hydrogen and fluorine - which would have a highly toxic exhaust, hydrofluoric acid! Yikes! Glad the rocket makers settled on LH2/LOX for high performance - only exhaust is steam.
|Starlinks - Web Design Agency |
March 28, 2017 01:59 AM PDT
Starlinks is a renown logo design agency in New Zealand that guarantees quality driven services. We are a professional web design agency in Auckland. Our other services include web development and customized e-commerce solutions. We work with a mission to gratify our clients. Let your company experience a proficient inspired breeze with Starlinks.
|buy concert tickets |
February 6, 2014 10:40 PM PST
If you are looking to get yourself concert tickets for the upcoming live performance and show Operas, visit Diamond Box Office official website today and get registered. Check out for more details.
|uk msc dissertation |
March 19, 2013 06:23 PM PDT
Turns out that the root cause was a power failure at our hosting company.
|Links of London Sale |
April 16, 2012 04:57 AM PDT
I like the writing structure of your blog and it does a pretty decent job of presenting the material.,647037,http://crowlspace.blogdrive.com/archive/55.html
|Leave a Comment:|