Need help for my spaceplane and FAR.

[cosmos33]

Mass is approx 12 T.I can't get this thing to go beyond 1500 ms (surface) at around 30 k. I'm using FAR i need help! Anyone good with far can show me a ssto that works with far ?

Edited December 28, 2014 by cosmos33

[GoSlash27]

cosmos,

Sorry, I know I have zero experience with FAR, but I need to point this out:

FAR derates turbojet thrust, so you can't have a turbojet powered spaceplane like you do in stock.

You'll need to use either RAPIERs or a turbojet/ rocket hybrid with a lot more DV from rockets.

I know a guy who's really good at FAR spaceplanes. I'll see if I can get him to help you.

Best,

-Slashy

[Jimbimbibble]

I see you're trying to exploit intake spamming. This doesn't really work in FAR. I'd suggest reducing your intakes so that it flames out around 30km and 1700m/s. Slashy is right that you will need rockets to make it to orbit. Two popular options are rapiers or turbojets + a nuke. Rapiers are better within Kerbin and turbojets + nuke are better for interplanetary spaceplanes.

[Wanderfound]

Okay, to start with:

* Too many intakes. It has massive drag. One ramscoop per engine is plenty for an atmospheric ship.

* No rockets that I can see. Not a spaceplane yet.

* Not enough lift. There's barely any wing on that thing.

* No lateral stability at all. Planes have tailfins for a reason.

* Barely adequate thrust. Two turbojets are enough to propel a plane with normal sized wings; they're massively inadequate for an ultra-low drag/lift design like this.

Have a look at post #2 and #3 of the Kerbodyne ​thread linked below.

Edited December 29, 2014 by Wanderfound

[cosmos33]

That would be appreciated. I believe the problem is that at some point my thrurst = drag. IF i add more engine, i need more intake which means more drag. Anyway if someone has done good ssto with FAR that be great.

[Wanderfound]

Try this one: http://forum.kerbalspaceprogram.com/threads/90747-Kerbodyne-SSTO-Division-Omnibus-Thread?p=1632210&viewfull=1#post1632210

.

Make sure you install Kerbal Pilot Assistant first, and cut the kp/kd values of SAS to 1/3 of default. Climb to 5,000m before going supersonic if you don't want to blow up the airframe.

Edited December 29, 2014 by Wanderfound

[cosmos33]

I'm playing a career and i dont have the rapier and cone intake yet.

[Wanderfound]

Change the cones to ramscoops, change the outer RAPIERs to LV-T45s. It'll be slower, but it should still work. Flick the rockets on for a second to give a little boost at takeoff.

You probably don't have the inline docking port either; change that for a small tank or a nacelle.

Edited December 29, 2014 by Wanderfound

[GoSlash27]

wanderfound,

A little background:

He was trying to build a spaceplane according to my tutorial, not realizing that while it would be just fine in stock, it wouldn't work for FAR.

That's why I asked you to help out; you're the FAR spaceplane guru.

Best,

-Slashy

[Wanderfound]

wanderfound,

A little background:

He was trying to build a spaceplane according to my tutorial, not realizing that while it would be just fine in stock, it wouldn't work for FAR.

That's why I asked you to help out; you're the FAR spaceplane guru.

Best,

-Slashy

Fair enough; no aggro intended.

This is the classic issue with stock; the tricks that you learn there are actively counterproductive when you go to a less unrealistic model. Things that should be intuitive need to be relearnt.

[cosmos33]

I made a ssto inspired by your design. I guess with FAR getting faster thann 1500 ms is hard. Si i got to 30 k and fired my engines. I got to orbit with more than 450 fuel. And lunched a small probe.

[Wanderfound]

Yup, 1,500m/s is the practical maximum for jets in FAR. 1,750m/s or so is reachable if you build a specialist speedster and take a long time building speed.

But 1,500m/s is plenty fast enough.

[cosmos33]

Specialist speedster ... How do you do that ? You mean having a pilot that specialise in speed ? if so how, if not you mean a fast craft ?

[Anquietas314]

Specialist speedster ... How do you do that ? You mean having a pilot that specialise in speed ? if so how, if not you mean a fast craft ?

I would guess a fast craft. Probably one with very sleek wings, plenty of thrust and enough intakes to run a little higher in the atmosphere than your typical spaceplane

[Wanderfound]

Specialist speedster ... How do you do that ? You mean having a pilot that specialise in speed ? if so how, if not you mean a fast craft ?

Like this:

Minimal drag, minimal mass. One turbojet, one intake, small wings, little fuel.

[cosmos33]

what mode you use to have the info next to the navball ?

[Wanderfound]

what mode you use to have the info next to the navball ?

Kerbal Flight Data​.