steph77

Your are right on that point BUT WAIT, This model is not exactly a good exemple, a good base to begin building. Of course, all the basics rules of building are respected : The structure is stiffen in 3d all around, all parts fix by minimum 2 points etc.... But, if you extract the structure by removing all functionnal parts you will quickly understand that this Moc comes to the point where the structure itself has to match with all the internal functionalities. I a sense, the approch is more sculptural than technical in order to achieve the goal of demonstrate the rotor functionalities. So, It is not perfect so far, lots of parts could be replaced and the building still can be simplified. I think this is all i love in building with lego parts.This point when just building become not enough and when you need realy to get your mind into the Inside of your model and begin the art's work. Thanks for comments,all Regards Steph.

Ok, it's done. 1252 parts + 2 (the old swashplate assembly that I didn't find in the library) Here are the LDD instructions: http://www.moc-pages.com/moc.php/443813 Some assemblies are not finalized as the back panels on the sides and flex elements, I didn't managed to. Regards, Steph

Here are the actual progress on LDD I do not find the swashplate metapiece on LDD, i was nearly sure it was in the library As i come mad with this, can someone help me to find it? On the other hand, LDD does not like some of my assembliesas at the base of the tail rotor, the piece that fix the angle doesn't match in LDD however it fits perfectly well and smooth in real life EDIT: the piece you see on base of main rotor is a system piece i'll use as basic design for going in with the LDD

Enough for today:446 bricks, all internal flight mechanics done. Next step is winch gearbox, landing gear and cockpit...

No glass seems to be the most coherent choice as there will not bin in front neither on lateral sides.

cool features and car Ia am curious on how you realize the switch between direction modes? Claas inspired?

first shots of the LDD: At first: the four axonometrial view of the real colored build. All controls of main rotor are in place and basically the beginning of the main frame. A little bit hard to understand no? Ok. So here are two colored view. one / function. -in light blue is the main collective linkage, -in purple is the cyclic lateral controls -in yellow is the cyclic frontwards/backwards control -And finaly, in light purple is the jaw controls. Black parts are obviously the joysticks assemblies To be continued... Thanks all for kind comments and HOF nomination ;) Steph. EDIT @Jim : I've tried to removed my attachment in the file manager. I do edit the two topics that contain files in order to post her my new LXF. But it fail. How to do that?

Hello! Good to see this project is still alive IMHO, you have a good idea on this built when thinking to not realize collective controls. It is true that there are not that much place to do it, and more important, not that much place to hide any excedent mechanics somewhere else. Back to your current build, I think that your rotor mast would need some reinforcement. As the total mast is quiet high, the fixation on the base must be very strong and it does not seems to be actually. It's also a good idea to work with blueprints, and I found your building is very close to it actually wich is a very good point I find. Good work!

LDD file is in progress

looking good or not is a very personal opinion. Whatever, there are lots of more in this model, i think to the suspension design f.e. Even if, in my opinion, the new panel could give a better render, i just recognised the great quality of this build.

This model is, i think, a real acheivement in my building skill. It's about 6 years i work on differents solutions and i found this one is a good one, specially for the commands localisation. Thanks all for comments and support Regards, Steph.

Hello, Maybe you could post a screenshot of your LDD file? This way some of us could probably tell you more about your build. Regards, Steph.

I think this project is enough advanced to declare it finished, Thanks all for comments and advice. Her is the final video, I hope you will enjoy it. Steph.

Hi Jeroen, This is a stunning pieces! Great job with it. If I had to say just one thing, I found a little sad that the inner cockpit controls are driven by some manually rotation command. I understand you have searched for the irreversibility and good locking of the moving parts but I had preferred a control by rods for those one. Excepted that, 11/10. +1 is for ejection seats

Hello, I will try this to see what it looks like. Thanks for suggestion :) I am planning a video now and i am searching some software that can take two video in a same picture, one will show the joystick and the second one the action on rotor. What do you used for video editing?

What do you think guys of that winch design? Manually operated finally. I just consider that PFS here was not the main interest as all other commands and stuff are manual. I also have a problem with the vertical panel on behind the front door and with the door itself. No idea on how to fix that as I can not describe what hit my mind on these points. Any idea?

Just imagine my headache when designing my Agusta laterally transferred commands to keep it logical Back on your topic,The above solution gives a good idea on how to do that About the linkage you have presented, it's a hiller-bell mechanism. The hardiest to understand. WARNING: undigested physics I 'am sure you've study this pictures in detail, but, to understand it you need to know one thing. I'll say int in French language just because I have (and google too) no idea on how to translate it : PRECESSION GYROSCOPIQUE. Ok. This physics law says that for any action on one rotating disk (the rotor is one of them) the reaction is maximal on the same point on the disk but on 90° rotation later in the rotation direction. To be clear, if you take one hammer and hit a blade situated on the left side of the copter, the reaction will take effect 90° later, in the front position of the blade considering it rotate in clock way. So, to understand your picture, on one hiller-bell type rotor, you need to consider any action on the joystick transferred 90° back with final blade position.... Anymore headache? You just have to ask, I have the solution... To complete this, here is a simplified model I made to illustrate the hiller bell mixing system. It is quiet different from the previous one I let you, here it is: look closely and you will understand that the two red 3L horizontal liftarms placed just behind the seat are the mixing cranks. Each has one collective input on one extremity and one cyclic input on the other side. The default of this build is that the back linkage was really weird, however it was functional. Have a nice day...

Ok, Here is basically how it usually works: - Pink pins are articulation points fixed to the main structure, all other parts are moving parts, - The yellow 90° parts (3X3 half liftarm) are the collective control shafts; - The red parts are the cyclic left/right controls; - And the green parts are the cyclic front/back controls; The joystick need to be connected to both red and yellow GREEN parts, The collective handle need to be connected to yellow parts. I hope this will make it a little more clear and that you'll understand my surprise looking at your translation system to convert the movements, Do not hesitate if you need more details:) Steph.

@efferman did a perfect model to demonstrate what i mean:

It is true i like models like this who are really challenging and really technical Inside :) I had noticed that the nose needs some reworking on. i will try Something but no clear idea at this stage The scale of the rotor head is deeply linked with the 7 studs wide swashplate. If you analyse closely you will notice that there is no real place for the jet engine due to the rotor's size. I had to make some compromise but the global shape is ok according to me, even if there is still some work. Thanks for comments. I need a pill now before going deep Inside the mecha to fit the last functions....

Actual state of the WIP: Front cockpit done, doors can be opened, not still 100% satisfied with it id: The rear view shows you rotors, tail commands and engine output The command situated on the inner roof of the cockpit is the main electric command (rotor rotation) I particlary like this point of view :) This begin to look like it had to do :) Next step is finding a way to insert in a way or another the winch mechanism. As usual....

Hey! It's beginning to work! I'am surprised by your translation systems but why not? Usually it is made used of a 90 degree rotation/translation system. Good work, may I invite you to build a really solid structure in order of locking every parasite torsion in the moving parts. This frame is a must have at this point... I am waiting next step ...the connection to the blades ...

Here is a link, from our forum, where you'll find all info ;)

The beast is coming to life: Today progress are on the bodywork, rear part of the cabin,and also in placing and connecting the tail rotor. As a particularity of the model of reference, the tail rotor is inclined by +/- 30° Its been quiet challenging to reproduce it, and it took me a major part of the day. Actually the landing gear are fixed, and I wonder more and more if i'll have enough place to realize the A plan. Will see. Below are two pictures showing the tail rotor in action: Neutral position: And maximum pitch angle. It's about 45° of movement (the same for main rotor).The pitch is controlled by the rightside joystick when pushing it frontwards or backwards. It's quiet logical to find the other collective function on this joystick, the other direction (up/down) controls the main rotor collective pitch. Time for a more general view from the rear: the back end of the superstructure is finalized, with wings and flaperons. Oh, I forgot it ;) I also placed the heart inside the beast, after battery box, a medium motor is now connected to the mechanics... The back doors can be opened... So now it's time to rest a little ;) The main questions I 'll have to answer now, as the place inside the cabin is very limitated, is to know if i'll try to motorized the additionals functions or not. The landing gear could be manually operated, the presence of two joystick makes sens in that manual conception. The winch would ideally be electrified, but I have to find the best way to do it. As usual, any comments are welcome :)

Hi everyone, This is my next project. Its a replica of the brand new Agusta-Westland - AW196 Air ambulance. This model is a lightweight transport helicopter designed to be able to achieve missions in about every possible environment. This is also one LEGO project, and I have tried to take lessons from my previous helicopter MOCs. At this point I have achieved the most difficult part of the MOC. The complete control center of the rotor's head is done and perfectly functional. But before, have a look at the global model in it's WIP state: The global shape is coming out of the bricks actually :) On this picture you can see one joystick standing lateraly in behind the pilot seats: And you have the same on the other side of the aircraft. Other point of view: So, what's the goal? I already build previously helicopters with onboard command, even realistic commands. It was pleasant but not always really practical. So this time I decided to make use of a pair of joysticks, one on every lateral side. The left joystick controls the cyclic movement of the rotor. When pushing it to the front/back the swashplate incline to the front and back (forwards and backwards translation of the aircraft). Pushing the joystick up and down makes the swashplate incline left or right (lateral movement of the aircraft) The right joystick controls: the collective mouvement of the rotor when pushing it up and down The pitch of the tail rotor (command is operational, tail rotor still to build) Actually, the main rotor is perfectly functional with large amplitude movement of the blade. This amplitude was a real goal of this MOC, because I found lots of beautiful build on the net, but not really one with real large movements of the blades. Other view of the rotor head, i'll explain you all of this later ;) On the other function point of view, the BB already is placed in front of the rotor in order to assure a good wheight repartition on the 3 points landing gear. I will place now a gear box with to reversible commands on it : one for the landing gear in/out command and one other for the winch, that actually does not exist. There will also be one main clutch gearbox for the rotors, in order to be able to use of the other function without rotor rotation. So, that's it for now guys, this is the first take of it. Building time: about 20 hours actually. Any comment or idea will be appreciate.