EPT![[image loading]](http://i.imgur.com/w5Ugk3I.jpg)
It needs less TWR and more intake (i don't even know how to fit enough intake on without it looking silly)
Kerbal Space Program - Page 32
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Cyro
United Kingdom20326 Posts
It needs less TWR and more intake (i don't even know how to fit enough intake on without it looking silly) | ||
Teoita
Italy12246 Posts
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Cyro
United Kingdom20326 Posts
IDK if this works with default settings Haha confirmed working full stock full throttle so.. that's one way to get the engines to work at a good altitude (just accelerate fast enough to throw yourself out of the atmosphere before they cut off) The thrust and the efficiency from these things is beyond insane though. Rocket can't compare, but they need a kick to get towards mach 1+ if the TWR isn't high | ||
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Osmoses
Sweden5302 Posts
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Cyro
United Kingdom20326 Posts
^vid from before, went a bit too fast (but not to worry, we are still flying half a ship :D) 15 TWR, holy shit those engines are strong | ||
Epoxide
Magic Woods9326 Posts
On April 28 2015 18:49 Osmoses wrote: Are those infoboxes on the right and numbers at the top mods? Yes, Kerbal Engineer | ||
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Cyro
United Kingdom20326 Posts
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Jetaap
France4814 Posts
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Cyro
United Kingdom20326 Posts
 Efficiency was the only advantage i saw from a quick glance, but it just doesn't matter when they're that efficient. The "inefficient" Rapier is 8x more efficient than nuclear engine as long as it has air | ||
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Jetaap
France4814 Posts
![[image loading]](http://images.akamai.steamusercontent.com/ugc/538521584425100119/5D0B33CE712E82D216CBC40974421F1E06242D39/) | ||
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Cyro
United Kingdom20326 Posts
![[image loading]](http://i.imgur.com/IZFBDiT.png) :D ![[image loading]](http://i.imgur.com/u0BTSDO.jpg) | ||
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stenole
Norway869 Posts
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Cyro
United Kingdom20326 Posts
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stenole
Norway869 Posts
Jet engines also have a velocity (meassured in mach) where they are able to provide the most thrust. For the rapier that is mach 3,75 where they are able to provide over 8 times as much thrust. At mach 6 they can't provide any thrust. More air intakes won't help (thankfully). I'm not sure how ksp calculates mach numbers. In real life sound travels slower at high altitudes compared to at sea level. One problem that can arise because of the increased thrust of engines is that if you are going at a speed that will break your aircraft, the engines will also be reving up causing even more speed, heat and death... unless you are prepared for it and throttle down fast enough. | ||
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Cyro
United Kingdom20326 Posts
At 20 km the rapier will have 9% of the thrust that it has at ground level if going the same speed. This is just removing intake stacking by making them useless because the engines don't work anyway. What altitude does rapier give max thrust on? just as low as possible? IDK how to get to orbit if you don't switch engines at 15km~ I was switching engines at twice that height before | ||
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Cyro
United Kingdom20326 Posts
The boosters lasted a lot longer than i intended, i just wanted to get kickstarted to ~200-300m/s+ for the air breathing engines to kick in. In the end it was too fast, but i'm not sure if slowing it down would actually help. I could take off with air breathing engines only and use them to throw it out of the atmosphere - it had 1.0 TWR without the liquid fuel boosters attached at 0m/s so i could just double up on the engines and it would probably be 1.5+TWR quickly rising far far higher with some speed. No reason to use this over an asparagus rocket though. I can't figure out anything useful to do with air breathing engines aside from fly around atmosphere quite fast for a really long time >__< Maybe you could make two planes with very very high TWR, strap a couple onto a payload and fly with them, decouple and have 3 pilot able craft. That seems pretty adventurous though | ||
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felisconcolori
United States6168 Posts
The second actually survived, but as I have the heat colors currently enabled, I can tell you it was a near thing for the shock air intake at the front. It's basically a shock air intake on a MK 1 inline cockput with two of the medium LFO+O tanks, a precooler, and a rapier engine. Delta wings on either side, on small delta wing with elevon for a tail, and some gear. It actually survived a 45 degree climb at full throttle until the rapier engine kicked over to rocket mode, at which point it then was a 0 degree horizontal acceleration until apo was up around 90k. Circularize, and in orbit. Haven't brought it back down yet, it's late. It kills me that this survives, while a well thought out MkII space plane using Big-S strakes and delta wing never fails to have the strakes explode rapidly upon hitting 800 m/s at any altitude. (To say nothing of fast ram-air intakes turn yellow and fail.) Ah well, more tomorrow. | ||
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Cyro
United Kingdom20326 Posts
I then trolled the KSP forums and found two different very minimalist designs. The first blew up repeatedly when attempting to fly the profile described, or else the picture didn't give me enough information to adequately recreate it. I've copied several designs, a few very simple and found completely different behavior to what they described. One of them was literally an intake, a control part, a pre cooler, an engine and 3 fins in radial symmetry and it behaved so differently to what was described+screenshotted that i don't think it could have been down to user error, we were just playing two different games physically. Maybe some people still have some mods enabled that mess with 1.0 physics | ||
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Jetaap
France4814 Posts
Next mission should to send a probe to minmus, maybe try to biome hop a little bit.. and then i'll start the interesting stuff with manned missions and interplanetary robotic missions! | ||
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stenole
Norway869 Posts
I was a little dissapointed today after spending lots of time creating the ultimate air breathing recoverable single stage launch booster. It was tricky to get into orbit with the payload I had chosen, but I did it. After getting it to work, I tested it against a haphazardly put together liquid-oxi engine with a single tank which was done in less than 10 seconds with no planning or testing. The liquid-oxi booster beat my complicated air powered booster by 600 m/s of deltaV which not only gets the payload into orbit but almost sends it all the way to the Mun. | ||
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