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fastest jet in ksp *UPDATED* 2/28/2019

Lego8_bit
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Pecan

Pecan

Posted
Posted
Okay, let's see what a FAR/DRE jet can do...

Just a quick little something I threw together.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot302_zps86f48d45.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot303_zps1d6deb3d.jpg

Up.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot304_zpse531af64.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot305_zps61c3c04a.jpg

Supersonic in the vertical climb.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot307_zps0ed0d0d8.jpg

Time to level off.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot310_zps8d7394fd.jpg

Getting warm.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot311_zpsb51e6e27.jpg

And finally into the hypersonic.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot312_zpse715e4ce.jpg

Top speed during the climb.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot314_zps135457ab.jpg

That's the top, time for a bounce.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot316_zpsb4fce4b6.jpg

Negligible thrust at this speed, the air is going through the intakes too fast for the turbojet to handle.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot317_zpsdbecee37.jpg

Getting some speed up...

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot323_zps5c9dda91.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot324_zpsb67d380f.jpg

Note the speeds in the previous two pics: the first is 1794.4m/s and Mach 5.67, while the second is 1792.0m/s and Mach 5.69. The first is faster in m/s, the second is faster in Mach. This is because Mach varies with altitude, while m/s does not. Which gives me an idea...

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot296_zps335d3dc4.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot297_zps51473f76.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot298_zps51810940.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot299_zps203ece23.jpg

Speed in m/s peaks here, at 1787.9m/s.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot300_zps913dfd49.jpg

Getting a bit on the toasty side.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot301_zpse762b55c.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot327_zpsff6d9436.jpg

Peak mach, 5.77. Oops.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot328_zpsc6a48cd6.jpg

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot329_zps0ac18094.jpg

This might hurt.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot330_zps05c9a5e5.jpg

Nup, all good.

http://i1378.photobucket.com/albums/ah120/craigmotbey/Kerbal/Challenges/Top%20Speed%20Challenge/screenshot331_zpsd8d986e2.jpg

So: 1794.4m/s or Mach 5.77, your choice.

Why do you go so slowly? Alright, this thread is all a windup but I usually get my jets to >2,200m/s at 30km altitude, with intake spamming (8 per jet).

ETA: On the way up, that is, of course. Re-entry can be all sorts of wierd since I don't use DRE.

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Wanderfound

Wanderfound

Posted
Posted
Why do you go so slowly? Alright, this thread is all a windup but I usually get my jets to >2,200m/s at 30km altitude, with intake spamming (8 per jet).

ETA: On the way up, that is, of course. Re-entry can be all sorts of wierd since I don't use DRE.

Powered by what? FAR cuts the thrust output of jets to essentially zero above Mach 5. A single-intake version of the plane I used would likely be a smidge faster, but that seems to be pretty much the limit without rocketry.

Keeping it below 40,000m also cut the speed significantly: I can get a fair bit quicker if I use a succession of ballistic trajectories with peaks >40,000m.

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Wanderfound

Wanderfound

Posted
Posted
Now I feel the need to 1-up that...

Do we need to bring a kerbal? And is the 2-intake limit a thing?

At 40,000m, airhogging is counterproductive: you're just adding weight and drag. One intake is enough to keep a turbojet running, and running is all you need. Minimise part count, maximise in-flight patience.

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Zipmafia

Zipmafia

Posted
Posted (edited)

Ok, I think that this will be my last entry. Just barely squeezed another m/s out of my design.

I also feel like sharing how I was able to obtain such a high speed.

VERTICAL INTAKES!! At least a few of the intakes should be pointed about 45* upwards. That way when your plane reaches escape velocity you can point it down to stay inside the atmosphere while retaining some air. My last few designs had ONLY vertical intakes, seeing as how air doesn't matter until you are way up there, trying to stay in the atmosphere. Also, don't worry about the ram intake on the front, it just slows you down.

Or the deadweight of wings for that matter... they're just drag anyhow.

You are totally correct, except that they are not dead weight. All of my vertical air intakes cause them to want to pitch over backwards (at least at first). The only thing keeping my planes stable are the wings. I tried several designs without wings, but none of them were stable enough while keeping my intakes.

I don't know if you noticed, but none of my planes have batteries, those ARE dead weight. The probe core carries it's own battery, and as long as you keep the engine running you will always have juice.

As far as I know, the aerodynamic model just adds up the drag from all the parts, and that is your ship's drag. More parts = more drag.

I give you "Last chance" @ 2324 m/s or mach 6.83

IGsuA1p.jpgdkB8zEl.jpg

So to summarize:

1. Vertical air intakes

2. Wings for stability

3. No batteries or solar panels

4. Less parts = less drag

Good luck all, I look forward to seeing some new designs.

Edit~ @Tsevion: Hah! I 1-up'd you.

Edited by Zipmafia
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Norcalplanner

Norcalplanner

Posted
Posted (edited)

Is cubic octagonal strut clipping in the VAB without using alt f12 allowed? And is the 8 intake rule per craft, or per engine? Because I have a space plane tanker that will reach more than 2,300 m with 5 ram intakes per turbojet. One of the photos shows 2,322.8 m/s at 36.5 km. http://forum.kerbalspaceprogram.com/threads/90337-Economic-Fuel-to-Oribit?p=1428382&viewfull=1#post1428382

Edited by Norcalplanner
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Tsevion

Tsevion

Posted
Posted
One of the photos shows 2,322.8 m/s at 36.5 km.

That appears to be orbital speed, not overland speed... since you're heading East, rotation of Kerbin is adding about 200 m/s, so your airspeed or overland speed are only 2120 m/s or so.

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Tsevion

Tsevion

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Posted

3. No batteries or solar panels

4. Less parts = less drag

Not quite... less mass = less drag... you're correct about it adding up the drag for each part, but the listed number is drag coefficient, which gets multiplied by the mass of the part so 2 parts weighing 1t each or 1 part weighing 2t will both have the same drag (assuming the same drag coefficient of 0.2, which most parts have). A number of parts, including all the radial mount batteries are physics-less meaning they effectively have 0 mass... so affect neither mass nor TWR.

Go here for more info.

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Norcalplanner

Norcalplanner

Posted
Posted
That appears to be orbital speed, not overland speed... since you're heading East, rotation of Kerbin is adding about 200 m/s, so your airspeed or overland speed are only 2120 m/s or so.

Aha -thanks for the clarification.

I just tried to make a small fast jet, but was thwarted by Interstellar currently being installed. That mod makes jet engines overheat a lot starting at 1200 m/s or so, even if there are no Interstellar parts on the plane.

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Lego8_bit

Lego8_bit

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Posted
Is cubic octagonal strut clipping in the VAB without using alt f12 allowed? And is the 8 intake rule per craft, or per engine? Because I have a space plane tanker that will reach more than 2,300 m with 5 ram intakes per turbojet. One of the photos shows 2,322.8 m/s at 36.5 km. http://forum.kerbalspaceprogram.com/threads/90337-Economic-Fuel-to-Oribit?p=1428382&viewfull=1#post1428382

its 8 intakes per craft

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Wanderfound

Wanderfound

Posted
Posted
Will a video be good enough evidence for my first entry into this contest, in the FAR categry, also, what is DRE, and do I need it to compete in this?

DRE is the Deadly Reentry mod (http://forum.kerbalspaceprogram.com/threads/54954-0-25-Deadly-Reentry-v6-2-1-Oct-12-2014). As for what bearing that has on the challenge...

screenshot329_zps0ac18094.jpg

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Roflcopterkklol

Roflcopterkklol

Posted
Posted (edited)

Edit:

I just read da rules, My SR-72 is a real air hogger, it has i think 28 air intakes not fair :( it is supposed to be insane in the upper atmosphere lol, ill bring it down to 8 and see how fast it goes. Unless it can keep all its intakes?

this 40km altitude limit is doing my head in.

i get to 2450m/s at 38km kill the engines and im on a peri aps to a 200km orbit.

There is no spoon

Edited by Roflcopterkklol
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Roflcopterkklol

Roflcopterkklol

Posted
Posted

Alrighty here is my new entry.

By rights this plane should be the fastest on the KSP forums :P

SR-72 White bird

2422.0m/s (8,719.2km/h or mach 7.1) oct 28. 100% stock craft using stock aerodynamics.

0iaLh8J.jpg

Using 8 shock cone intakes and two ram air jet engines the SR-72 white bird reached a maximum recorded speed of 2422.0m/s at an altitude of 36,765 meters without breaching the 40km altitude limit after shutting down the engines. (It will go 2500m/s+ at 40km.)

Download link to the craft file used for this challenge, try this plane for yourself.

http://www./download/4zqhtslxc709l48/SR-72+White+bird+%28Fastest+jet+challenge%29.craft

DIaOwPi.jpg

10km 358.9m/s

n8YFImw.jpg

15km 689.3m/s

C20Ikxw.jpg

20km 1172.5m/s

WR45m3S.jpg

25km 1649.7m/s

3QnOvVO.jpg

28km 1908.8m/s

nbPC6hf.jpg

nIuPwEZ.jpg

XwpoNng.jpg

2QjKd65.jpg

Max speed at 36765m

0iaLh8J.jpg

i reached 40250m before bringing my ascent back below the horizon, please tell me that 250m is not unacceptable lol

9HgjsaS.jpg

back below 40km 33 seconds later(hardly went over in the first place lol and i was not under power when i did hit 40km

xfphmZx.jpg

DLSHb3r.jpg

xbT57bX.jpg

NXhA0UL.jpg

LNSbova.jpg

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Zipmafia

Zipmafia

Posted
Posted
Using 8 shock cone intakes and two ram air jet engines

I like the plane, but the rules state only 8 intakes.

I might try to make one similar to see if I can get over 2400 m/s

Edit~ or do you mean two jet engines? I originally thought you meant two ram air intakes.

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