[STOCK HELICOPTERS] The First Turboshaft Coaxial Rotor System!

[Azimech]

Coaxial has been done before, but with jet engines in the rotor blades.

This is the first coaxial rotor system using my turboshaft principle.

NEW! COMPLETE HELICOPTER: THE CTR2D "Frunobulax"

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Instructions:

Hit space twice. Select probe core (Front or top), enable SAS. Be cautious of horizontal speeds higher than 10m/s.

NOTE: Any explosions you see and hear are just the separators falling from the craft. This is harmless.

Download link: http://kerbalx.com/crafts/1076

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NEW ENGINE BUILD!

The CTR2 1.0

Part count reduced from 502 to 401!

Height reduced from 16 to 13 meters!

Mass reduced from 91 tons to 27 tons!!

Lifts off with throttle at 20%!!

Instructions:

Hit space twice. Select probe core (Front or top), enable SAS. Be cautious of horizontal speeds higher than 10m/s.

Download link: http://kerbalx.com/crafts/1075

NOTE: Any explosions you see and hear are just the separators falling from the craft. This is harmless.

---

And here's the original version, the CTR1! Still a fine machine, very reliable and extremely powerful!

502 parts, 91 tons with tanks full, 50x50x16 meters.

Enjoy.

This was the first flying version, took me 4 hours to build and test. It's got a few small bugs but the principle is sound.

No cheats, completely stock!

Instructions:

No need to touch the throttle and hit space twice. No need to steer too, this one is stable by itself.

Here 's the download link: http://kerbalx.com/crafts/1001

Next goal: FAR & NEAR compatibility.

Edited February 12, 2015 by Azimech

[Azimech]

Do you guys & gals want a download link?

[Yukon0009]

hell yes. hell yes.

[Azimech]

Download is live!

[Azimech]

It's a big baby. Maybe we can convince Squad we need more small parts with the same strength properties - i.e. more materials and thus more flexibility in the node strength system.

[Azimech]

New version! Fixed some tolerances! Performance increased considerably, can now take off, with full tanks and throttle at 50%!

Instructions:

No need to touch throttle. Hit space twice.

It will take off by itself.

[Azimech]

Early attempt at making the system into a real helicopter.

[Redshift OTF]

This design blows me away! I'm not going to bother reverse engineering this one, (too complicated), but I did re-use the bearing from your other helicopter to make my own.

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Some of the tweaks I made included shifting the wheels around slightly as the turbine fan rotors where clipping some of the wheels, added more turbine fans for better performance, also moved the jet engines so they pointed more towards the edge of the turbine fans. The whole thing seemed a lot more reliable at variable speeds. I prefer the twin rotor blade designs personally.

Thanks for this, it's been a lot of fun and I am hoping to engineer an even smaller bearing that can handle really high speeds!

- - - Updated - - -

Also, if you want another challenge, how about a single rotor helicopter with a working tail rotor?

[Azimech]

New version! Weight decreased from ~90t. to 32t! Reduced number of parts from 502 to 322! Reduced height from 16m. tot 13m!

Takes off with throttle at 12%!

Updated OP!

- - - Updated - - -

This design blows me away! I'm not going to bother reverse engineering this one, (too complicated), but I did re-use the bearing from your other helicopter to make my own.

Some of the tweaks I made included shifting the wheels around slightly as the turbine fan rotors where clipping some of the wheels, added more turbine fans for better performance, also moved the jet engines so they pointed more towards the edge of the turbine fans. The whole thing seemed a lot more reliable at variable speeds. I prefer the twin rotor blade designs personally.

Thanks for this, it's been a lot of fun and I am hoping to engineer an even smaller bearing that can handle really high speeds!

- - - Updated - - -

Also, if you want another challenge, how about a single rotor helicopter with a working tail rotor?

Thanks! Can't give you any rep at this time. I am curious about your tweaks in detail ... the first turbine was indeed a bit wonky in a few ways. A working tail rotor is interesting but would require a lot of parts. It's easy to do in IR, not so with stock. First we need to invent a working gears system.

Edited February 10, 2015 by Azimech

[Redshift OTF]

The new version looks very nice! I can't wait to download it. I've managed to make my own bearing design which is a lot more compact however I don't think it is as rigid as yours. It's not so good at handling higher speeds so I just used more rotor blades for more lift at lower rotor speed. It still needs some more tweaks so I will upload it tomorrow.

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[Azimech]

Super! Have you tried the engines of the 5H2U? Those are uprated, produce much more power with less flaws than the 5H1.

Edit: New: complete helicopter! Updated OP!

Edited February 11, 2015 by Azimech

[zekes]

seriously impressive. I need to hop on the rotor bandwagon soon.....

[Jon144]

This is all really impressive. I wish I had more time for KSP so I could improve my own designs. I think we should collaborate more with this type of thing.

I think I can say you have nearly completely outdone anything relating to stock helicopters I have worked on.

Bravo! ! !

That being said the body still needs work. But that's the easy part.

Edited February 11, 2015 by Jon144

[Azimech]

Thank you, guys & gals! Very much appreciated!

[Redshift OTF]

You got a download for your latest version yet? Also, I give you my first replication where I have shrunk the turbo-prop down. It's a bit juddery but stable, fast and small. I'm using cubic octagonal struts as the prop fans as they seem to do a better job. I also have an idea for an even smaller bearing design but I have know idea if it will even work yet!

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Download here

I noticed it was easier to control the craft with 2 long thinner rotor blades. Other combinations seem to store directional energy which moves circular from pitch to roll to pitch and back to roll again making corrections very difficult. With this rotor setup the directional energy dissipates really quickly so you don't need to correct for your movements.

[Redshift OTF]

Hmmm, looks like my new rotor bearing might work. It does away from using small fuel and RCS tanks so the pieces hold together stronger. This one is less powerful as it only has 4 engines but you can mirror to 6 or 8 if needed.

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[Jon144]

Goodness I really need to get around to making my own replication. I have ideas myself from my experiences to make it more compact but even more stable.

You guys are right about the dual blade setup being more stable. If you fly my two bladed helicopters you will find them much easier to control than my others.

I have an idea in making a turbo-electric motor.

[Azimech]

I started a challenge:

http://forum.kerbalspaceprogram.com/threads/110356-Turboshaft-Helicopters

- - - Updated - - -

You got a download for your latest version yet? Also, I give you my first replication where I have shrunk the turbo-prop down. It's a bit juddery but stable, fast and small. I'm using cubic octagonal struts as the prop fans as they seem to do a better job. I also have an idea for an even smaller bearing design but I have know idea if it will even work yet!

I noticed it was easier to control the craft with 2 long thinner rotor blades. Other combinations seem to store directional energy which moves circular from pitch to roll to pitch and back to roll again making corrections very difficult. With this rotor setup the directional energy dissipates really quickly so you don't need to correct for your movements.

Interesting ... I'm going to test it right away :-)

Edit: I have trouble lifting off, there is much internal friction, wants to jam, and wants to tip over. I eventually used hack gravity to get off the ground. While flying I read the rotor speed in rad/s. It alternated between 5 and 12 the whole time. If you don't have these problems, then there must be a difference in our installs.

By the way, impressive vertical speed! Climbs much faster than any of my designs!

Edited February 12, 2015 by Azimech

[Azimech]

CTR2 1.0 is ready for download! Check the OP!

[Sampa]

Coaxial has been done before, but with jet engines in the rotor blades.

This is the first coaxial rotor system using my turboshaft principle.

http://www.aerospace-technology.com/projects/kamov32/images/ka_32civil_7.jpg

NEW! COMPLETE HELICOPTER: THE CTR2D!

http://imgur.com/a/mnB9H

http://i.imgur.com/Y6Crd66.gif

http://i.imgur.com/6FWS5rX.gif

Download will be ready soon!

NEW ENGINE BUILD!

The CTR2 1.0

Part count reduced from 502 to 401!

Height reduced from 16 to 13 meters!

Mass reduced from 91 tons to 27 tons!!

Lifts off with throttle at 20%!!

Download link: http://kerbalx.com/crafts/1075

Instructions:

Hit space twice. Select probe core (Front or top), enable SAS.

http://i.imgur.com/j7gRRGo.gif

http://i.imgur.com/IWBlAtD.png

Download will be ready soon!

NOTE: Any explosions you see and hear are just the separators falling from the craft. This is harmless.

And here's the old version. Still a fine machine, very reliable and extremely powerful!

502 parts, 91 tons with tanks full, 50x50x16 meters.

Enjoy.

http://youtu.be/DewK1UGZR78

The original! The CTR1!

This is the first flying version, took me 4 hours to build and test. It's got a few small bugs but the principle is sound.

No cheats, completely stock!

http://i.imgur.com/pRnoT4Z.png

Instructions:

No need to touch the throttle and hit space twice. No need to steer too, this one is stable by itself.

http://i.imgur.com/v4HJUaZ.png

Here 's the download link: http://kerbalx.com/crafts/1001

Next goal: FAR & NEAR compatibility.

All I can say is, "How? What? Uh..." I mean really, how in the world did you manage that?! I didn't even think that it was even plausible in the stock game!

[Azimech]

CTR2D "Frunobulax" is ready for download! Check the OP!

[Redshift OTF]

Hmmm, I think the bearing I uploaded has some phantom struts left on it that I forgot to remove and end up connecting to the shaft near the bottom. I'm surprised it still turns with them on! I'll have a look at it over the week end but perhaps that is one way to make a bearing without wheels lol.

[Azimech]

And ... if you like, think about the challenge :-)

[Redshift OTF]

Ah yes, I might do the challenge but I wanted to try a bunch of bearing ideas first as that is the core of the design. Been a bit flu-ey so I didn't do anything last night. One thing I noticed was that the white cone adapter thingy isn't very fire proof which is a shame.

[Redshift OTF]

I submitted to your challenge thread as I didn't want to keep clogging up this thread with my designs.