Jump to content
  • 0

LV-N Atomic Motors on Spaceplanes?


MessyMix
 Share

Question

Hi guys!

I've recently started playing again (since 0.90 Beta); I stopped for a while from version 0.24 because of life. Now, when I check out some videos on Youtube I find that many people are now using the LV-N engine on their crafts, even though a) it's pretty damn heavy B) thrust isn't high therefore c) low TWR. The only positive I can think of is the high efficiency, but otherwise, why are many people using LV-N's on their spacecrafts? (Apologies for the noob question!)

P.S. I find that the KSP community has the absolute best community ever!!

Thanks guys! :)

~Messy

Edited by MessyMix
Link to comment
Share on other sites

15 answers to this question

Recommended Posts

  • 0

Due to being heavy but efficient, their real niche is long interplanetary stages. I typically build reusable LV-N tugs to haul things around between planets. One or more tugs docks to the payload and pushes/pulls it around the Kerbol system.

Link to comment
Share on other sites

  • 0

A different benefit of the new LV-N is that it uses LiquidFuel only, the same as the regular air-breathing jet engines. This theoretically allows you to have an SSTO spaceplane that only uses, and has the tankage for, one type of fuel. With a refueling station in orbit, such a design could theoretically go pretty far, compared to a conventional rocket-powered craft that would need to carry extra mass in now-useless oxidizer.

The catch, of course, being that a turbojet/nuclear SSTO is hilariously inefficient when it comes to getting to orbit.

edit: and ninja'd.

Link to comment
Share on other sites

  • 0

Thanks for all your replies guys! Didn't realize it's now liquidfuel only xD

Side question(s): Because a turbojet/nuclear is so inefficient at getting into orbit, what do you guys suggest in it's place? What setup would you use to get to Mun? Mimmus? Other planetary systems? Obviously I see that as distance goes up, the importance / positive aspects of using a LV-N increase exponentially. :)

Thanks once again!

Link to comment
Share on other sites

  • 0
Obviously I see that as distance goes up, the importance / positive aspects of using a LV-N increase exponentially.

Remember of course that Distance is irrelevant, only needed Delta-v is.

For example, The surface of MoHo is quite a bit further than the surface of Eeloo.

And a low solar orbit is **dozens** of times further still!

Link to comment
Share on other sites

  • 0

LV-N's also got a ridiculous, unrealistic, and fundamentally broken overheating mechanism in 1.x, which basically prevents them from making long burns without themselves or whatever they're attached to blow up. To work around this, you have 2 options. The preferred method, especially for spaceplanes, is self-help modding via ModuleManager, to make the heat essentially the non-issue it should really be. The other alternative is to only attach LV-Ns to really huge friggin' tanks that can absorb the silly, unrealistic, and fundamentally broken overheat without exploding. This, however, isn't really an option for spaceplanes.

Link to comment
Share on other sites

  • 0
LV-N's also got a ridiculous, unrealistic, and fundamentally broken overheating mechanism in 1.x, which basically prevents them from making long burns without themselves or whatever they're attached to blow up. To work around this, you have 2 options. The preferred method, especially for spaceplanes, is self-help modding via ModuleManager, to make the heat essentially the non-issue it should really be. The other alternative is to only attach LV-Ns to really huge friggin' tanks that can absorb the silly, unrealistic, and fundamentally broken overheat without exploding. This, however, isn't really an option for spaceplanes.

Uh.

screenshot344.png

This is from a hypersonic egress through the atmosphere, and burning for six minutes straight with two LV-Ns at full throttle. No alterations or hacks. Barely past orange, nowhere near overheat temperatures. You just need proper design.

(On that note, can we have some Mk2 nosecones without oxidizer storage? The extra line in the resources bar is annoying me, it's never meant to be filled on this design.)

Edited by Sean Mirrsen
Link to comment
Share on other sites

  • 0
This is from a hypersonic egress through the atmosphere, and burning for six minutes straight with two LV-Ns at full throttle. No alterations or hacks. Barely past orange, nowhere near overheat temperatures. You just need proper design.

(On that note, can we have some Mk2 nosecones without oxidizer storage? The extra line in the resources bar is annoying me, it's never meant to be filled on this design.)

Seconded, my turbonuke SSTO works just great thank you. I find a 28t ship with 2 nukes and 3 jets works perfectly. I have gotten it into orbit with 1900 m/s dV remaining.

@Sean Mirrsen, I have edited my own Mk2 parts to have no oxidizer. It's not hard to do. Just make a new subfolder under GameData (mine is called 'LiqFuelParts') and copy over the relevant files from the Squad parts folder. For example to make a liq fuel only Mk2 bicoupler you need bicoupler.cfg. bicoupler.mu and mk2adapters1m.dds.

Then edit the .cfg file as follows, deleting the Oxidant section and adding units of liquid fuel to compensate. My edits in red.

PART

{

name = mk2_1m_LFBicoupler

module = Part

author = Kuzzter

rescaleFactor = 1

node_stack_top = 0.0, 0.9375, 0.0, 0.0, 1.0, 0.0

node_stack_bottom01 = 0.625, -0.9375, 0.0, 0.0, -1.0, 0.0

node_stack_bottom02 = -0.625, -0.9375, 0.0, 0.0, -1.0, 0.0

node_attach = 0.0, 0.0, 0.7, 0.0, 0.0, -1.0, 1

TechRequired = advAerodynamics

entryCost = 19800

cost = 860

category = Propulsion

subcategory = 0

title = Mk2 LF Bicoupler

manufacturer = KuzzCo Engineering

description = One engine is not enough? Don't need oxidant? We got you covered!

attachRules = 1,1,1,1,0

stackSymmetry = 1

mass = 0.29

dragModelType = default

maximum_drag = 0.2

minimum_drag = 0.3

angularDrag = 2

crashTolerance = 50

breakingForce = 50

breakingTorque = 50

maxTemp = 2000 // = 3000

fuelCrossFeed = True

NoCrossFeedNodeKey = bottom

bulkheadProfiles = size1, srf, mk2

MODEL

{

model = Squad/Parts/FuelTank/mk2Adapters/bicoupler

}

MODULE

{

name = ModuleLiftingSurface

useInternalDragModel = False

deflectionLiftCoeff = 0.3

dragAtMaxAoA = 0.2

dragAtMinAoA = 0.1

}

RESOURCE

{

name = LiquidFuel

amount = 400

maxAmount = 400

}

}

...and save. Note that the filenames stay the same, the part will be a unique part because it is in a different folder from the Squad parts folder. When you load the game next, the new part will look exactly like the LFO bicoupler but the name and descriptions will change. Do this for any other parts you like.

Edited by Kuzzter
Had wrong fuel amount in sample .cfg
Link to comment
Share on other sites

  • 0
^^ You don't even need another folder, just change the name of the cfg and leave it in the same place. The stock Mk2 and Mk3 tanks that come in LF and LFO tanks work this way.

Yes, thanks Red you're right of course. I suppose I just like leaving the stock Squad folders as they are, I'm afraid to muck around too much in there :)

Link to comment
Share on other sites

  • 0

I've certainly attempted such a thing, but in the end for practicality LV-N on a plane makes no sense at all. A plane has wings and jet engines to get it through the atmosphere, those wings and engines have mass. You are better off having an interplanetary transport launched by a rocket that sits in orbit and use the space plane to get to it than hauling all the mass of wings to other planets. Unless, you are going to Laythe.

Link to comment
Share on other sites

This thread is quite old. Please consider starting a new thread rather than reviving this one.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...