Spaceplane flight path

[Noticeably FAT]

I've been tinkering with some spaceplane designs lately, and I've actually come up with something that does pretty well when it comes to atmospheric flight. I've been trying to turn it into an SSTO craft, but I'm struggling with the TO part of that equation. I think it ought to be able to achieve orbit (I can get it out of atmo easy enough, but I don't have enough rocket dV to circularize), and I have a feeling it's my flight profile that is screwing me. Right now I take it up to 16-20km, let it hit top speed on jet engines (1.somethingkm/s), light the rocket and stand it on its ass, shut down the air breathing engines before they flame out. This... doesn't work well. So, how should I be going about things to get this thing into orbit?

I can't remember the exact numbers and don't have access to KSP at the moment, but here is what is powering it: 2 turbojet engines with 2 jet fuel tanks and 4 ram air intakes. 1 aerospike with 4 FL-T400 fuel tanks. I don't remember the weight of the ship, but it's little more than fuel, a couple wings and a cockpit. Does this sound like it should get into orbit? I can post a pic later this evening when I get home.

[Noticeably FAT]

Well, after some more dinking around I got it figured out. More fuel for the aerospike and a lower angle got me into orbit, with enough to get me up to my station for refueling.

[bsalis]

I needs pictures.

[RawChicken]

Yes, when firing the rockets you should not put it on a vertical position, its better giving it some inclination so that the apo rises on top of you, then cut engines and get to apoapsis and burn to circularize there.

[numerobis]

Fly higher on the jets; with two intakes each, you should be able to zoom up to 21km, level out, and speed up while slowly climbing to 25 km at about 2km/s horizontal speed. Then you'll need very little rocket fuel to finish up.

[HoY]

Profile for my spaceplane, they are almost all the same to get to orbit, depending on how many intakes you use.