sevenperforce

Kerbals have unlocked the secret to the Infinity Torch -- a special module which taps energy from an alternate dimension and allows any engine to perform at 100% thrust with no propellant at all. (This module can be enabled by selecting Alt+F12 and checking "Infinite Fuel"). With this came the rise of torchships -- vehicles capable of performing Brachistochrone trajectories, accelerating constantly from Kerbin's SOI toward their destination and then turning around and accelerating in the opposite direction until they arrive. Space travel has grown exponentially, and it's time for you to make your entry into the interplanetary transport market. The challenge: Build an Executive Torchship transport suitable for Brachistochrone transfers. Fastest possible round-trip time wins. Rules: SSTO, obviously. No need to stage when the rocket equation is broken. Your vehicle must not take damage at any point during the mission. All stock. You need to be able to take off and land in style, on any surface, so it must have separate VTOL landing engines. You need crossrange capability, so your craft must be aerodynamic enough to fly to your landing site using aerodynamic control surfaces before engaging its VTOL engines. This also will allow for a survivable crash-landing if you suffer engine failure. Torch drives can be finicky, so you need to carry at least enough propellant to make your final landing without Infinite Fuel turned on, just in case. Kerbin doesn't yet have inertial dampening technology, so for your executive passengers' comfort you must keep your total gees below 8 at all times. You must carry at least four passengers and at least one pilot; command seats are not allowed. Round-trip mission time is any amount of time during which the vehicle is moving. So you can land at your destination and wait as long as you want for an opportune launch window; it won't count against your mission time. Entry levels (will have separate leaderboards): Torchship Jockey. Take off from Kerbin, land on both the Mun and Minmus, and return to any place on Kerbin (no splashdowns). Torchship Navigator. Take off from Kerbin, land on Duna, and return to Kerbin within sight of the KSC. Torchship Pilot. Take off from Kerbin, land on Eve, and return to a landing on the runway at KSC. Torchship Commander. Take off from Kerbin, land on Laythe, and return to a landing on the helipad on top of the VAB. Torchship Master. Use your torchship for a Grand Tour, landing on every body in KSP other than Jool. I'll put together some cool badges once we have entries and can award them. Good luck!

It's a RTLS, though, so it all balances out.

Already factored that in. At the equator the ground's speed is 464 m/s due east; at 28 degrees N latitude (Cape Canaveral) it is 409 m/s due east.

Speed shown in the stream start relative to the ground, but the speed tracking algorithm changes to orbital speed gradually during ascent, because there is a smooth transition from zero to orbital speeds. This can be seen in cases where the speed of stage 2 is tracked; the final velocity is correct for the orbit rather than being reduced by 409 m/s.

Comms? Instruments? Gotta be more specific.

@Bottle Rocketeer 500 What does the EM-7 Logistics Module entail? Is it just a refueling mission? Something that docks onto the DST?

Eh, I seriously doubt anyone would worry that the US Government is secretly disguising its nukes as rockets. Anything substantially heavier than iron is only formed in trace amounts during core-collapse supernovae or, very rarely, in neutron-star collisions.

In all honesty, they should vary the mass ratio and volumetric ratios of the tanks at each diameter. Mk3-sized tanks are probably hydrolox, so they should have poor volumetric ratio and good mass ratio. Mk2-sized tanks are probably methalox, so they should have medium volumetric ratio and medium mass ratio. Mk1-sized tanks are probably kerolox, so they should great volumetric ratio and poor mass ratio. The smallest tanks are probably hypergolic and should have absolutely fantastic volumetric ratio and really really poor mass ratio. It's more realistic but doesn't require anything extra from players.

Since I use the Oscar-B and Round-8 fuel tanks primarily for small probes, landers, and service modules, my head-canon says they are probably hypergolics, which have a high density.

At T+2:28, MECO, altitude is 61.1 km. At T+2:32, staging, altitude is 65.2 km. Thus, the average vertical component of velocity is 1.025 km/s. Since staging velocity is about 1.63 km/s, this means the horizontal component of velocity is roughly 1.27 km/s. However, Cape Canaveral is comoving underneath at a nice steady clip of 409 m/s, meaning that the Falcon 9 first stage only needs to kill about 860 m/s of downrange velocity to essentially "stop". In certain cases, there may be a need for both boosters to land on an ASDS. In such cases, the core will be going so fast that it will almost certainly be expended. So they will probably need one more ASDS for the Atlantic. I don't anticipate another one for the Pacific.

Distilled water is just fine to drink, though in the long run it can deplete the minerals in your body. Deionized water, on the other hand, is much less safe. In small quantities it is fine, but if you drink enough of it, you can end up dehydrating yourself because the semimpermeable membranes in your cells will leak water in an attempt to equalize the ionic balance.

I want to know this too. I also want to know if we can use reverse thrust.

Nice! By the way, here's EM-6.

All right, we've made it to EM-6. Time to design the Deep Space Transport, a hab and propulsion module to take Kerbonauts beyond the Kerbin SOI and into interplanetary space! It's a little longer than I wanted, but as you can see, it's got six cupolas, a mobile processing lab, and a 4-kerbal can, for a total of 12 seats. Two spare docking ports in addition to the one on the nose. The propulsion module is beefy, with a fair bit of bipropellant, a tweakscaled-up xenon tank, and a large monoprop tank. More radiators, both fixed and deployable, and two very very long solar array arms. I'll get to those later. As you can see, fuel loading is low, both to comply with challenge requirements and because the SLS Block 1B couldn't throw a full one all the way to cismunar space anyway. The fairing is much longer than I'd like, but oh well. Nice clean booster separation. Burning for orbit. Core burnout with a disposal periapsis. Fairing jettison. Like I said, this was too long for my tastes, but there's really no way to make it much more compact than this. EUS ignition to circularize. Circularized! Now came the fun bit. Remember those long solar arrays? They each contain probe cores, reaction wheels, and RCS tanks+blocks...so all I had to do was decouple them and then recouple them. Easy, right? First one done! Second one swung a bit far out... Steady as she goes... There we are! Solar arrays deployed! A beautiful sight. Turned on the radiators, because why not? Trans-munar injection burn, started. Firing up the EUS again. Full throttle. Had to autostrut the solar arrays to keep them from bending over like twigs. Halfway through the burn. Really cut it close with my periapsis, though I suppose that's good for Old Oberth. Finishing it out. Not bad! And a disposal orbit for the EUS to boot. Separation. Engines fired up. Burning all engines for capture. Nice shot. Plotting how I'm gonna catch up with the DSG. Shutting down the main engines. Intercept maneuver near apoapse on ions alone. This solar array is fantastic. Inclination canceled, primary intercept set up. Time to match velocities and complete the rendezvous. Doing all this on ions. Approach... Nearly there! Aaaand now the Deep Space Transport (albeit not-very-fueled) is docked to the Deep Space Gateway with Orion attached. Where do we go from here?

But still, divide by 3.6. There are 3600 seconds in an hour and 1000 meters in a km, so there are 3.6 km/hr in a single m/s.

Very, very low. Earth has a high proportion of heavy elements because we got smashed into by Theia and we have a very high amount of geothermal activity, forcing heavy elements up into the crust. There wouldn't be enough in asteroids to mine.

I've considered it but my supply of plutonium is a bit low. EDIT: In all seriousness, one of the big things with NTRs is the design. You can get up into some really wicked exhaust velocities if you're willing to bump up to a pebble-bed reactor.

Something like this has been proposed here before, if I recall correctly. **does a quick search** Ah, no, it wasn't here; it was over on the xkcd forum. One big problem. If all you have at the base is a bell-shaped cavity, then you have no choke, where flow moves from subsonic to supersonic. If you have no choke, you have no proper rocket engine at all.

You can vary the O/F ratio in-flight to start with high thrust and then transition to lower thrust with higher specific impulse. That's how the Saturn V rocket was able to lift so much more payload (rovers, etc.) with the later Apollo missions; they adjusted the mixture ratio of the engines across the course of the flight to maximize thrust at liftoff and then increase specific impulse over time. So "what's in rocket exhaust" will vary from "reaction products plus excess oxidizer" to "reaction products plus excess fuel" over the course of a burn, at varying ratios.

Hospital supply.

If you're on Windows, use F1 to screenshot, then go to your KSP source folder where they are stored.

Yeah, my thought is to set up the eccentric tangent orbit, burn target-retrograde in the rescue vehicle until relative velocity is less than 500 m/s, then switch to Burbarry and burn target-retrograde to match.

A standard jetpack has 650 m/s of dV, per the wiki.

You can try angling the front wings down slightly and the rear wings up; this will move the COL back behind the COM. Of course, this may limit climb angle as it increases the chance of your rear wings stalling, and it will may not work very well for maneuvering. Might want canards. Some of the smaller orbital Star Wars style spacecraft would be cool.

I used a wheeled delivery system for my stock Sea Dragon: