How much dV and fuel would be needed to ascent from Eve?

[Bearsh]

How much dV and fuel would be needed to ascent from Eve, And Dock with a parent ship to take the ascent vehicle to kerbin orbit.

Then the ascent vehicle would undock do the deorbit burn from kerbin, Decouple from the ascent vehicle and parachute safely down.

Thanks.

[Giggleplex777]

From sea level to orbit, you'll need more than 11km/s of delta-v and a TWR greater than 1.7. Good luck.

[Bearsh]

From sea level to orbit, you'll need more than 11km/s of delta-v and a TWR greater than 1.7. Good luck.

Alrighty then. Thank you.

[Horan]

From another thread i read that is costs only +-9000 dv from the top of mountains on eve

[Amagi82]

From sea level, with a perfect ascent, just barely clearing Eve's atmosphere, you need: 11,582.77 dV

From Eve's highest peak, at 7,526m, with a perfect ascent, just barely clearing Eve's atmosphere, you need: 5,263.15 dV

You aren't going to have a perfect ascent, so I'd recommend bringing more than that. Shoot for a thrust to weight ratio of around 2.0, and make sure you're getting Eve TWR, not Kerbin TWR. The above math just goes to show you how huge the difference is between a surface ascent and an ascent from high altitude.

[tavert]

Where's that 5263 number coming from? It's closer to 8 km/s from the highest mountain.

[technion]

From Eve's highest peak, at 7,526m, with a perfect ascent, just barely clearing Eve's atmosphere, you need: 5,263.15 dV

.

It's my understanding that mountain got nerfed, and the highest peak isn't quite so high any more. That should also address tavert's point.

[Red Iron Crown]

Eve ascent requires at least 8km/s of atmospheric delta-V from a mountaintop and over 11km/s from sea level. How much fuel this requires is dependent on payload size and staging.

[StrandedonEarth]

Delta-v map:

[The Silent Majority]

Kind of repeating others but it's approximately 11-12 km/s from sea level

[KerbMav]

Any experiences with using FAR and KIDS (in basic settings: "thrust varies with ISP" and "extend curve to zero") in an Eve escape?

[DrMonte]

Any experiences with using FAR and KIDS (in basic settings: "thrust varies with ISP" and "extend curve to zero") in an Eve escape?

FAR reduces required dV on EVE. Can't say exactly but about 10-20%.

[KerbMav]

That sounds not much - Kerbin ist going from 4500 to 3500 dV?

Which would be just over 20% ...

[Redshift OTF]

It would be better if the remenants of the launch vehicle is left in orbit and return ship docks with the launch vehicle. Otherwise you are trying to lift RCS tanks and monopropellant off Eve which will cost you loads of DeltaV.

[AeroAviation]

Over 9000!

[Red Iron Crown]

It would be better if the remenants of the launch vehicle is left in orbit and return ship docks with the launch vehicle. Otherwise you are trying to lift RCS tanks and monopropellant off Eve which will cost you loads of DeltaV.

If you can dock using just the monopropellant stored in the capsule, there is zero mass/dV penalty. If you're using a command chair it's better to use the mission profile you describe.

[cantab]

Unless KER is lying to me (very possible) the monoprop in the command modules still has mass. It's the bottomless supply of EVA fuel that doesn't.

[Red Iron Crown]

Unless KER is lying to me (very possible) the monoprop in the command modules still has mass. It's the bottomless supply of EVA fuel that doesn't.

I've never thought to empty the MP tank in a capsule to save mass, makes sense now that you mention it. Thanks for the tip!

[KerikBalm]

Or you could add the RCS thrusters which have no mass (due to the physics significance=1 line in the .cfg file), and use that monoprop for an extra bit of thrust.

I'm not sure at which point in the ascent that it would be most efficient to use up the monoprop. Its ISP sucks, but even more so low in the atmosphere- but considering the "engine" is massless, and you could have decoupled everything and be left with just the 6 ton lander can -> I often use the monoprop plus a pair of RCS as the last stage. If that fails... abandon ship, and jet pack

[Redshift OTF]

I've never thought to empty the MP tank in a capsule to save mass, makes sense now that you mention it. Thanks for the tip!

I didn't know this either. Could be very useful!

[gilflo]

I built a 10500dv rescue ship that allowed take off to join a 90km orbit from 4200m

See here:http://forum.kerbalspaceprogram.com/threads/74221-The-Rescue-of-Maldous-Kerman

Take off TWR around 1.6