1.0 and efficiency

[seyss]

Hello,

On KSP 0.9 I had the craft below that once put in orbit around Tylo or Moho, it could land fine using the method in the video below.

But now on KSP 1.0 I can't land.. my deltaV is much lower for some reason (burn time decreased from 8m43s to 3m55s). I checked the parts I'm using and they weren't modified from 0.9 to 1.0, except the LVN's weight.

What is going on?

Thanks.

Edited June 14, 2015 by seyss

[FancyMouse]

You're using even less than half the fuel before (since O is heavier than LF, and I assume you use the same fuel tank as 0.9). It would be a surprise to me if the same design would have worked!

[Signo]

You're using even less than half the fuel before (since O is heavier than LF, and I assume you use the same fuel tank as 0.9). It would be a surprise to me if the same design would have worked!

+1

Moreover I think the engine has got its weight increased in 1.0.

[seyss]

So LVN eats more LF than before, is that it?

[FancyMouse]

+1

Moreover I think the engine has got its weight increased in 1.0.

OP did notice that, but the fuel change is actually much more hidden but more important in terms of designing a rocket, as the same fuel tank doesn't carry the same amount of fuel as before.

- - - Updated - - -

So LVN eats more LF than before, is that it?

eats more LF, right, and eats LF at the same rate as the old LF+O (hence stays the Isp)

[seyss]

thanks.. so the best solution for LV-N is to use a larger fuel tank with more LF and zero O... too bad about the container weight which will be heavier

[Snark]

Or use one of the Mk2 LF tanks intended for spaceplanes. Looks kinda clunky but does the trick.

[Arkalius]

The LV-N isn't worthwhile on small craft due to the lower reaction mass density. On smaller craft you're better off with the terrier. Plus the LV-N is much heavier than the terrier, and more expensive (if that matters to you). The LV-N is more useful on much larger craft with large overall mass, where the mass of the engine isn't such a significant portion of the dry mass of the ship, and where Mk2 or Mk3 liquid fuel fuselages can be used (the Mk1 are pretty bad on spacecraft).

[seyss]

I got fed up with what Squad did to LV-N in 1.0 and modified the config file to restore the original capabilities (2.25t weight, 4000ºC max temp, 1º gimbal, LF+O fuel).

If you want it back up the original file in another folder first. https://mega.co.nz/#!NYBUxAKQ!JibyiqHx3JweQQoANyO0ffU7-FKPZ_lhy0KuXRATFRo