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Kenny Loggins

Having Problem with SSTO

Question

Hello, I come to you all with a dilemma. I have been playing this game for a long time, but I'm having an issue. Prior to the 1.0 update, I had little problem with SSTOs, however, after the changes, I have not had much success. I was able to make a small one-man SSTO work, however, it is not of much use to me as it cannot dock, only has enough fuel for reentry after establishing orbit, and cannot carry any cargo. The main craft I have been working on, however, I cannot get to successfully establish orbit, much less rendezvous with either my station or my refueling station. I have shaved off much of the profile, reduced drag by eliminating excess external components, and played with how much fuel I load, but to no avail. If anyone has any ideas for how I can improve the craft, and hopefully make it work well, it would be greatly appreciated. 

Images Below

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Edited by Kenny Loggins

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Seriously guys, thanks so much for all the advice! Got it to orbit with some spare fuel, gonna try to dock with my station now. 

Spoiler

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On a side note, definitely thinking of making a different ship for longer flights after this with nukes, after all the helpful info you guys have provided, I think I could actually make it work!

Edit: SUCCESS! I have docked with my refueling station! The next goal is to dock with my main station without refueling, for transporting kerbals to/from the station.

C1RceIK.jpg

 

Edited by Kenny Loggins
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12 hours ago, Kenny Loggins said:

 I always seem to have a significant excess of liquid fuel left in my craft when I run out of oxidizer. Any advice?

It may be the case you are not using your jet engines as much as would be ideal. For that case I will let the spaceplane guys offer better advice than I have.

However a different possibility its that you carry more liquid for those engines than they require. You may try to substitute you liquid fuel tanks for some LFO or just reduce liquid fuel tankage.

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6 hours ago, mk1980 said:

example of a simple crew plane similar to the one OP asked for:

https://imgur.com/a/9NRZv

quickly thrown together. very simple handling - basically just throttle up, take off, set nose to ~10° and let it soar. engine cutoff after about 4 minutes, then fast forward to AP and circularize after ~10 minutes game time (maybe 5-6 minutes real time due to physics warp/normal time warp after engine cut off)

still plenty of fuel left for some rescue missions in low orbit or docking to a space station somehwere in LKO.

Didn't realise this was a race !

I built this, two rapiers, two panthers and four NERVs.  Normally I'd say that's for a 80-100T vessel but i thought i'd put that on a 60T and see if it makes for faster flight times.

On my "usual profile", which means levelling the plane off to go supersonic and for the speed run by triggering an action group , while staying prograde lock, you're looking at a flight time of 19 minutes and 1230dV.       I guess that's at least 5 action group button pressings which is of course too hard.

I tried your method with this ship, set a constant pitch angle and leave it, but due to the curvature of the planet the nose rises too much and we're fully stalled by 35km and starting to loose vertical speed.

So ,  I made another flight where i just set prograde lock and pressed the space bar twice to start all of the engines, including the nukes, as soon as the craft spawned.    Plane zooms to 30km, then nose dives to 12km at mach 4, then zooms up again to a 75km AP.      Never had to cut the engines,  the circularisation burn all got merged in with the main one.    The proper name for this technique is flying like a bellend.   However, it did get us to orbit in under 10 minutes, at the cost of 700dv

lt6Us57.png

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1 hour ago, AeroGav said:

Didn't realise this was a race !

It don't need to be...if it become a race I'd entry with a overpowered rocket than can reach the orbit in a couple of minutes wasting a s-load of fuel. :cool:

If being SSTO, spaceplane is a requirement, something like this

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just for fun(and messing with the spaceplane crowd).

On a side note, I should take the time to develop this craft. The planes have some serious flaws and the rocket being a SSTO was just lazy design.

 

Back to the realm of sanity: several good ideas in this thread. There is a good chance that I will adopt a design similar to those of @zolotiyeruki and @mk1980. There is any chance to spare a craft file?

 

 

 

Edited by Spricigo
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2 hours ago, Spricigo said:

Back to the realm of sanity: several good ideas in this thread. There is a good chance that I will adopt a design similar to those of @zolotiyeruki and @mk1980. There is any chance to spare a craft file?

Let me see if I can do this....

https://kerbalx.com/zolotiyeruki/Crew-shuttle-spaceplane

It's not a finished work by any means, but it's pretty easy to get into orbit and return to KSC.  You'll need to add RCS thrusters and tweak the control surfaces to use only the axes you want, but other than that, it's very usable.

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