Real DV needed to take off and orbit Eve

[Tazin]

Hey guys! i'm seeing a lot of different numbers on DV maps, ranging from 6k to 12k. The latest seems to be 10k. But still it doesn't tell me if that is considering a sea level launch. I have set up my refinery on top of a mountain on Eve, at 5000m altitude. What would be a realistic DV number to design a ship that can land there, refill and lift off?

Emilio

[Foxster]

For wingless craft: It is variable depending on the TWR of your craft. If it has lower TWR then you need more dV. For every craft you have to find the sweet spot of fuel mass versus TWR.

You will be lucky to get a rocket with 5500 dV to orbit from 5000m and that will want an initial TWR of around 1.5.

There is a mountain that is 7500m high with a not too steep area near the top that will help with this.

[tbarcello]

https://play.google.com/store/apps/details?id=com.amagi82.kerbalspaceapp

I got you. Don't worry, I got you. Upper right corner in that app, seriously.

PS: this time i got it right! ... Right?

[Warzouz]

I did it once from 1200m and used 6500m/s. BUT, I trying to sized down my vehicle and fails at 7000m/s since...

I think 7500m/s should be a safe value. But the variation might be very high, depending on your ship aerodynamics.

[Claw]

But the variation might be very high, depending on your ship aerodynamics.

This is highly important. A ship with lots of things hanging off it, like a bunch of flat drop tanks hanging on the sides, is going to require a lot more dV to get to orbit. So I know you're looking for a ballpark number to design for, but also realize that the design itself is going to matter a great deal.

Cheers,

-Claw