How do i make a spaceplane with both a jet engine and a liquid fuel engine?

[Rabble]

I saw a video of some guy going to the mun with a Spaceplane and he seemed to have both engine type.
Jet for atmospheric flight and the liquid one for space.

How do i make such a thing?
And how do i switch between one engine and the other?

I'm new to spaceplane.

[jhendriks87]

i think you are after the rapier engine, which can switch between modes.

[Rabble]

Originally posted by jhendriks87:

i think you are after the rapier engine, which can switch between modes.

Oh.
Is it a hard engine to obtain in career mode?

[jhendriks87]

I think it is in one of the last tiers. Other options are to decouple your air breathing engines after you use them

[Rabble]

I see.
Thanks for this answer.

[Kadrush]

You dont, make a rocket. Use the KSP runway for weekend BBQs....

[Rabble]

Originally posted by Kadrush:

You dont, make a rocket. Use the KSP runway for weekend BBQs....

https://www.youtube.com/watch?v=5oaOo-pvS2I

[Just Jim]

OK, I believe this is what your asking about:

http://steamcommunity.com/sharedfiles/filedetails/?id=555143596

I tried to get a good shot of the engines. The inside one is a whiplash turbo-jet, and the outer two are rapiers. They are action keyed, so I can switch between the two. The rapiers are action keyed to switch between jet and rocket mode, and I also action keyed the air inputs, so I can close them down outside the atmosphere. She burns very little liquid fuel in the atmosphere, so most of the fuel tanks are for the rapiers when they're in rocket mode. The extra liquid is stored in the Big-S wing strakes.
Warning, you'll need the entire jet "branch", if you will, of your tech tree filled out to make one.

[AlexMBrennan]

How do i make such a thing?

Add jet engines and wings to your rocket design. You might want to use jet fuselage bodies but that's kinda optional.

And how do i switch between one engine and the other?

You want to use action groups to turn off the airbreathing engines and to close the air intakes to reduce drag when they run out of air.

I think it is in one of the last tiers. Other options are to decouple your air breathing engines after you use them

It's not decessary to drop the jet engines - they *are* dead weight once you reach space, and reaching orbit would be easier if you dropped dead weight but it's perfectly possible to carry them into orbit.

Here's one I made earlier, using 2x late game Whiplash ramjets and 2x LV-N atomic engines http://steamcommunity.com/sharedfiles/filedetails/?id=590857189

[Geredis]

Uh, it kinda helps if you can actually see what the ship even looks like. A night shot may look cool and all, but except for some radiant glow around some engine nozzles (I think) there's nothing I can really make out in that design.

[AlexMBrennan]

Uh, it kinda helps if you can actually see what the ship even looks like

Sorry, I guess? It was the first flight, and of the three screenshots I took it's the best looking one.

The salient point is that it that I stated that is has turbojet engines and is in orbit (110km x 70km as shown in the kerbal engineer data) with 1600 m/s delta V.

This is sufficient to demonstrate the suggestion that you need to either decouple/drop turbojets or use the RAPIER is untrue. The point was not to show off late game spaceplane designs.

Edit to add: Here's a better screenshot from the SPH. There really isn't much intricate detail http://steamcommunity.com/sharedfiles/filedetails/?id=590956454