XR2 auxillary fuel tanks- efficient launch

Grover

Saturn V Misfire
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ive been pondering with a thought for a few days, and ive decided its worthy to earn a place here:

if you eject both auxillary fuel tanks (main fuel) after launch, the XR2 weighs over 700Kg less, so it reduces fuel cost in later burns [considerably (?)]. i usually find that after i launch, and set my ApA to up to 500Km i am still greatly suborbital, and the path the tanks take would land them a few hundred miles west of Australia (launching from Wideawake, but should also work from KSC). this means we wouldnt have to worry about people being hit in the streets by falling space debris, and even in the exceptional circumstance that the tanks go further than expected, they would never make it to land.

my question is: in the event that similar craft are invented, would this be acceptable for astronauts to do, or are there more risks than i am aware of?

i understand a few flaws, such as a northern/southern launch, launching north lands the tanks west of Australia, but a southern launch could land it in indonesia (or maybe the other way around, i forget :( ). and from KSC it only works with a launch azimuth of 42* (otherwise Africa gets the ET, not the indian ocean)

other than that, its a simple method of fuel conservation on long flights. my own launch routine emptys the first tank and 1/2 the second on the ascent to 25Km and drains the last tank almost exactly raising the ApA to 500Km.

thanks guys
-=Grover=-
 
I wouldn't worry about the tanks hitting anyone, so long as they would burn up in the atmosphere upon reentry.

Another way to make the launch more efficient / extend spaceborne range is to strap on rocket boosters. In this respect I might jury rig some JATOs to help get my station-building XR5 off the ground, and use the TX as a mothership for the XR2 :)
 
Why not launch the XR-2 on top of a TX? [ame="http://www.orbithangar.com/searchid.php?ID=421"]TX winged space launcher, release 5[/ame]
 
I was just about to mount my XR2 onto the TX. It's a very good idea as most of my fuel is spent rising above the thicker part of the atmosphere. Once I'm above 50km I can get most of my orbital speed from the scram tanks :)

I would like a few JATO rockets bolted on my house; ahem, XR5 too to help with heavy payload launches :)
 
Of course, if you feel like a challenge, you can use the XL-70... :rolleyes:
attachment.php

When I tried releasing the fuel tanks after MECO in my scenario, though, they landed in Brazil... :facepalm:
 
The URL for the config and everything else is included in the requirements section of the scenario description (the scenario in the post I linked to above). RTFM, please. ;)

Also, if you're making a video, be warned that animations are not supported by replays: even if you record a perfectly nominal launch, in the replay the XL70's gear will never retract, the wings won't fold, and the XR2 won't separate without input.
 
Oh sure :3

As for the animations, no problems with that. I can do a lot of camera tricks and manual 'prop' activation :D Just need the recording to fly for me.
 
the idea was to make the tanks re-useable, once they had splashed down, they could be retrieved and used again, as i understand the SRBs on the atlantis are, just clean them up, check theres no holes, and put them in the next one to go up.

i dont like the idea of a launch vehicle, id prefer it to get up there itself.

what i meant was, in real life is there any way that it could change its direction somehow and hit someones house? its not entirely an orbiter question.

thanks
-=Grover=-
 
Hitting houses - yes, if discarded at low enough velocity, that's why there are exclusion zones for spent stages (and also NOTAMs).
 
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