[MOC] CFM RISE engine

[Leviathan]

Hello everyone, 

I'm pleased to present my latest personal creation: the CFM Group's RISE engine!

This is a turboprop engine program known as Open Fan, i.e. without a nacelle enclosing the main fan. This kind of prototype, still at the demonstrator stage, should equip future aircraft by 2025-2030, if promises of reduced fuel consumption are kept! (https://www.cfmaeroengines.com/wp-content/uploads/2021/07/CFM_RISE_Whitepaper_Media.pdf)

Like my version of the LEAP 1C already built in 2021 (https://www.flickr.com/photos/147164115@N07/albums/72157718957968196/with/51653430599/), I wanted to propose a standing model version once again with functional and motorized elements.

I started the design at the end of 2023 and spread it out over 7 months. The final model is made up of around 1,300 parts, measuring around 20cm in diameter and 30cm in length.

The big technical challenge lay in the mechanism for varying the incidence of the main rotating and fixed blades in a single movement, using a lever concealed in the base of the support!

Let's see the photos:

Technically speaking, to fully understand the concept, we need to distinguish between the "rotating" front fan blades and the "fixed" rear blades. A central mobile made up of 2 cradles is guided in translation by a linkage system. In transit, this mobile tilts all the eccentrically-mounted blades. The trick thing about this mechanism is that, from a single translation movement of the mobile, the front blades turn anti-clockwise, while the rear ones turn clockwise.

You'll see, it's easier to understand on video!

 

 

Of course, the entire mechanism operates when the motor is rotating.

In addition to the technical challenge of packing this mechanism into a small footprint, I didn't neglect the aesthetic aspect of the motor to make it recognizable. Some will notice the painted parts on the blades and the nose. For the cylindrical part, which is always tricky to render in Lego, the motor is made up of 1 10-sided barrel using this assembly technique: https: //brick.camp/en/tech/clip-handle-swivel-decagon.

In the compressor section, the rotating skirt is also inverted to fit under the conical cowling.

Thank you for your reading, I hope you enjoyed it !

More photos available in HD at this link: https: //www.flickr.com/photos/147164115@N07/albums/72177720315475122

Paid instructions are available on Rebrickable: https: //rebrickable.com/mocs/MOC-180038/Levihathan/cfm-rise-engine/#details

If you have any comments or questions, please do not hesitate :)

@+

 

[Divitis]

Well done! The engineering seems to work great and so cleverly hidden you'd think it's nothing more than a display piece at first. 

 

PS: I can't believe nobody shared a token of appreciation for this. With all the complaints about Lego only releasing cars and trucks I would have expected more excitement for something unique and inherently technical like this.

[2GodBDGlory]

You're right, this does deserve more comments! It is a very nicely done model with an interesting topic, combing good looks and interesting functionality! Also really nice presentation

[Leviathan]

On 4/23/2024 at 11:11 AM, Divitis said:

Well done! The engineering seems to work great and so cleverly hidden you'd think it's nothing more than a display piece at first. 

 

PS: I can't believe nobody shared a token of appreciation for this. With all the complaints about Lego only releasing cars and trucks I would have expected more excitement for something unique and inherently technical like this.

 

On 4/23/2024 at 4:21 PM, 2GodBDGlory said:

You're right, this does deserve more comments! It is a very nicely done model with an interesting topic, combing good looks and interesting functionality! Also really nice presentation

Thank for your comments guys ! Glad to hear you enjoyed the model ! 

[Good old Lego builder]

Very impressive! Looks really nice. 

[Leviathan]

On 4/29/2024 at 8:16 PM, Good old Lego builder said:

Very impressive! Looks really nice. 

Thank you very much !

[nerdsforprez]

Very impressed with this.  Admittedly I have not been able to look at all the details or spend the time it deserves. But I will be returning to it.  But just at first glance, had to comment on how impressed I am with this build. I would not be surprised if when I return to this topic and look further into the details, I purchase the instructions and build myself... 

 

[Davidz90]

Very nice model and pretty unique topic!

(regarding engine itself, this concept has been tried multiple times in the past, there are severe limitations related to mach number, noise, safety of exposed blades... I'm skeptical, but that's offtopic )

[nerdsforprez]

On 4/10/2024 at 1:45 PM, Leviathan said:

 

Can we also get details on the image to the right?  Is this another build of yours? 

[Leviathan]

On 5/2/2024 at 9:56 PM, nerdsforprez said:

Very impressed with this.  Admittedly I have not been able to look at all the details or spend the time it deserves. But I will be returning to it.  But just at first glance, had to comment on how impressed I am with this build. I would not be surprised if when I return to this topic and look further into the details, I purchase the instructions and build myself... 

  

Thanks for your comment, I hope you'll enjoy building according to the instructions! 

On 5/2/2024 at 10:00 PM, Davidz90 said:

Very nice model and pretty unique topic!

(regarding engine itself, this concept has been tried multiple times in the past, there are severe limitations related to mach number, noise, safety of exposed blades... I'm skeptical, but that's offtopic )

That's the whole point of a demonstrator: to be disruptive! Beyond the design, the fuels with which the engine is compatible also give hope.

On 5/2/2024 at 10:45 PM, nerdsforprez said:

Can we also get details on the image to the right?  Is this another build of yours? 

Yes! you can find it here : 

https://rebrickable.com/mocs/MOC-133571/Levihathan/cfm-leap-engine/#details

 

Regards !

[Leviathan]

Hello, I have made a animated gif to understand the mechanism :

 

To put it simply: the turquoise carriage is moved backwards by the white rods. As it moves backwards, the carriage tilts the green and coral blades, which are mounted on an cam. Finally, the green parts rotate, linked by a 12/20t angle gear. The entire mechanism is returned to its initial position by 2 springs (not shown).

 

[Leviathan]

Hello guys ! 

I'm trying Lego Ideas adventure ! If you want to support this project, you can make it following this link : https://ideas.lego.com/s/p:077efa8688a443d0930fc6486d529361

Thank you in advance !

 

 

 

 

[Davidz90]

Supported!

[Leviathan]

Thank you !

[Type25]

You have my vote. Pleased to do it for you.

[Leviathan]

Hello,

I've reached the 200 votes on Lego Ideas ! 

For this occasion and because I like this kind of stuff, I've made an BluePrint for the RISE engine  : 

 

You always can support the project here : https://ideas.lego.com/projects/077efa86-88a4-43d0-930f-c6486d529361

 

 

[Leviathan]

Hello everyone,

I'm pleased to present a new version of my RISE motor: it differs from the previous one in that it doesn't have a power up motor on the support foot.
With this version, I wanted to operate the internal mechanics via the extraction cone at the rear of the motor. This makes it easier to vary the speed of rotation of the various compressors while playing with the variation in incidence of the blades.

The inventory has been simplified and some minor design and assembly corrections have been made, such as reversing the angle of the low-pressure turbine at the rear of the engine (convergent to divergent).

I hope you will like this new version, the building instructions are available on Rebrickable : https://rebrickable.com/mocs/MOC-198495/Levihathan/cfm-rise-engine-manual-version/#details

You can also support the project on LEGO IDEAS : https://ideas.lego.com/projects/077efa86-88a4-43d0-930f-c6486d529361

See you !