Tylo. (Tylo Lander Certification)

[Flixxbeatz]

I'm developing a heavy 2-man lander that will be docked into an interplanetary ship for a Jool Conqueror mission. There will be 2 of them, one for Vall, and another for Tylo. I want to be sure that it can land at Tylo safely since I myself don't even know if it'll make it successfully there even if I've tested it many times already.

Here's the lander in question:

I've ground tested it already, and it sure can lift off in itself (and can probably even go to orbit around Kerbin). Now the question is: Can it land on Tylo and return safely?

Also, some tips on Tylo landing and other recommendations will be appreciated.

[allmappedout]

If it has enough dV to orbit Kerbin, and is being carried there by another ship, then it has ample dV to get down and land and back up again and return.

[kahlzun]

100km<->Surface Tylo ~3100ms dV each way.

Tylo gravity 0.7G.

You will need a TWR exceeding 0.7 Kerbin normal, and for a land-and-return, you'd need around 6300ms of dV to do it safely.

Keep in mind Tylo has no atmophere.

You're probably overthinking the heavy lander there, keep in mind the EAS-1 seats, which allow you to carry Kerbs on your vessel very cheaply: Even manned, the seats only weigh about 0.15T, 1/4 of the mass of the next most efficient capsule (Mk1 Landercan).

Also, do you really need ALL that RCS?

Also: stats on the ship would be helpful (dV, wet and dry mass, what the shrouded engine is, etc)

Edited July 10, 2013 by kahlzun

[astropapi1]

Is it SSTO on Kerbin? Does it have ~4100 Dv?

Also, check out Scott Manley's Tylo Or Bust video:

[Flixxbeatz]

100km<->Surface Tylo ~3100ms dV each way.

Tylo gravity 0.7G.

You will need a TWR exceeding 0.7 Kerbin normal, and for a land-and-return, you'd need around 6300ms of dV to do it safely.

Keep in mind Tylo has no atmophere.

You're probably overthinking the heavy lander there, keep in mind the EAS-1 seats, which allow you to carry Kerbs on your vessel very cheaply: Even manned, the seats only weigh about 0.15T, 1/4 of the mass of the next most efficient capsule (Mk1 Landercan).

Also, do you really need ALL that RCS?

Also: stats on the ship would be helpful (dV, wet and dry mass, what the shrouded engine is, etc)

The shrouded engine is a Poodle. Also, I might cut down some RCS because of that suggestion.

Is it SSTO on Kerbin?

It's a two-stage insanity. I found out that the return stage alone can get me from the launchpad to a significant height during testing.

[Giggleplex777]

What's the TWR of your lander?

If it's lower than 3, I recommend landing it like this:

Edited July 10, 2013 by Giggleplex777

[Tidus Klein]

I found if you have a smaller ship with ASAS, and you don't need to dock, you don't need RCS at all! The sas gives plenty of torque even for landing.

But hay the best thing I got is a super small rover on eve and duna that's the best I have been able to do so far. ( off topic, but man that eve reentry was stunning) I actually had to aero-brake in to eve because my deep rocket did'ent have the DV to retro it to orbit:( the point of the story is when it comes to large deep space rockets just look the other way when I talk.

Edited July 10, 2013 by Tidus Klein

[Flixxbeatz]

What's the TWR of your lander?

If it's lower than 3, I recommend landing it like this:

-snip-

I haven't found out yet, but it sure can lift off from the launchpad with no ease. And I think I'm not pro enough to pull of that kind of landing.

[Giggleplex777]

Landing my lower-than-1 TWR lander was a big pain in the butt.

[Maxwell Fern]

What's the TWR of your lander?

If it's lower than 3, I recommend landing it like this:

Is this an efficient way to land ? Fuel wise ?

[Giggleplex777]

Is this an efficient way to land ? Fuel wise ?

It is pretty efficient, because you're constantly killing both your vertical and horizontal velocities until you land.

[K^2]

Is this an efficient way to land ? Fuel wise ?

Yes, actually. We've just had a thread discussing that, and it turns out that this is the most efficient thing you could do.

[tavert]

I just ran the numbers (delta-V cost for landing vs TWR and Isp) for Tylo and all other atmosphere-less bodies using the constant-altitude trajectory in Mathematica, and posted the results here: http://forum.kerbalspaceprogram.com/showthread.php/39812-Landing-Delta-V-vs-TWR-and-specific-impulse

Edited July 11, 2013 by tavert

[kahlzun]

i'd still like to know the vitalstatistix for the launcher: thrust, wet/dry mass etc.

Looks like you could attach a couple of balloons to it, and you could take off from anywhere...