steph77

about the stepper, i made use of it (slightly modyfied though) in a moc. see below: Very compact, ultra efficient...

The only vital parts are the swashplate elements. If you do have them, it wouldn't be a major problem to build it :)

Thanks! About the blades: They does… EDIT : some precisons. In fact if you make the real rotor turn at the same rpm than the lego model, you will get the same result. With higher power the Energy, by gyroscopical effect, is transfered to the aircraft's structure. the whole rotor, according to physical rules will keep a stable angle relatively to the aircraft itself, explanations: Hope this is clear...

5. AH-77 HUNTER Building of a fully functional combat helicopter. General overview : dimensions: 65(L) X 27(W) X 20(H) Weight with standard batteries : 1.208 kg Parts count: 1421 LDD file : http://www.moc-pages.com/moc.php/450322 PDF Instructions credits @Ivan_M : https://rebrickable.com/mocs/MOC-21317/Ivan_M/ah-77-hunter-helicopter/#bi Functionalities embedded: - Flight control: - collective main blades control by a lever, - cyclic main blade control by a joystick in the cockpit, - tail rotor pitch control by a lever - Adjustable rear spoiler by a control gear - Orientable IR pod and front gun by a joystick in the cockpit - Motorized rotors and functional fake turbo-engines - Opening elements like doors of the cockpit, engine compartment - Functional suspensions on main landing gear - Orientable rear landing gear wheel Vidéo: Link to the discussion topic:

AH-77 HUNTER : THE FINAL REVIEW This is my final presentation for this contest. General overview : dimensions: 65(L) X 27(W) X 20(H) Weight with standard batteries : 1.208 kg Parts count: 1421 LDD file : http://www.moc-pages.com/moc.php/450322 PDF Instructions credits @Ivan_M : https://rebrickable.com/mocs/MOC-21317/Ivan_M/ah-77-hunter-helicopter/#bi Functionalities embedded: - Flight control: - collective main blades control by a lever, - cyclic main blade control by a joystick in the cockpit, - tail rotor pitch control by a lever - Adjustable rear spoiler by a control gear - Orientable IR pod and front gun by a joystick in the cockpit - Motorized rotors and functional fake turbo-engines - Opening elements like doors of the cockpit, engine compartment - Functional suspensions on main landing gear - Orientable rear landing gear wheel In the following section i'll try to give the maximum of information specially on the conception POV The technical design: I do not based this MOC on any defined real machine. However the general conception is the mixing between some cobra and apache design From my experience on building such project I quickly defined a basic design for this model. Building Lego helicopters mean you need to understand the constrains and reserve the neccecery spaces in your build to integrate the mechanics, especially the flight controls. By separate the flight control and gun control I dedicated the space for each functionalities. as the flight control need more space, I place them under the pilot seat, as this one is higher than gunner's one. The other main aspect is the motorization integration. As Lego batteries box and engines are difficult to integrate in a helicopter design, I take the decision to use the BB as part of the design itself, it take place as a credible technical compartment of the aircraft. About the two medium motor I used, I choose this setup as I wanted a single two blades rotor. This meaned a slightly higher RPM setup to keep a good dynamic impression when rotor engaged. About the flight control, my very first goal was, after quick Mocup test, to demonstrate the real functionalities and have a visual impact of the flight control on the rotor head and blades. The very important thing to understand here is that whatever the swashplale position it is the real aerodynamic effect of the blades that is shown. For this reason, the rotor head is fully articulated. This also mean I had to integrate the whole constrain of a real flight machine and particularly the gyroscopical effect. In a sense I think that the only missing thing for it to flight is some real power... The last aspect I kept in mind from the very beginning of the build was to get the system vibration in acceptable limits. This had a real incidence on the joystic design, the choice of each single pin (with or without friction), the main mast design,...This was the really harder part. Then and finally there was to integrate all these minded things in a cool model. The build was also concentrated on the clean design of each element and this in order to get a sturdy and well designed model The design: Based on a narrow frame and tandem pilot position, the overall shape had to give a powerfull and nasty aspect. It's a hunter after all... I worked this model on one high table so I mainly looked at it from a 'ground POV' and here is the result: From the back the overall shape is quiet good. Note the design work on the underside armouring. Directly inspired by the apache real model. In case of ground fireing the pilot has to expose the underside of the helicopter who is specially armored. The underpart is therefore wider than the cockpit. The cockpit area integrate a scaled place for two pilots. with the joystic commands in right place. As the model is really thick I take the decision to simplify the integration of the tail rotor and the collective lever. They are located outside of the cockpit. I also didn't wanted to place any printed parts to simulate computers or flight commodos. I made the choice to keep in a 'pure technic' design The gunner seat is also ergonomically thought and credible for a pilot to seat in. The correspondent joystick controls the tilting and rotation of the main front gun and pods. I made use of professional stickers to enhance the exterior design I do add a little lever that locks the collective lever, this one tended to vibrate with the blade rotation. it gives a free position, high and low lock: these are the possibilities of the main gun and pod positions: Moving to the side here is a still not shown view of the rotating fake engine of the hunter. The two engine are located on opposite side and connected to the main transmission. I use of some little 1X5 panels to simulate some physical protections of the engines. The engine bay is openable : moving to the back of the aircraft we have the stabilization flap: this one is intended to eliminate the residual vibration generated by the flight at high speed and the thrust generated is adjustable according to the flight speed and exterior conditions. command by the lateral black gear. Finally the rotors... these pictures show you the maximum angle of the main blades: neutral position - maximum collective pitch (thinking that the cyclic pitch still need to be added and by consequence the rotor head design always need to take care of this aspect) maximum cyclic pitch: The tail rotor has, this time, positive and negative angles And now some static view of the aero effect on main rotor: full pitch backwards - full pitch frontwards and the respective effect on main rotor inclination: see the final part of the video to complete this explanation. The left and right action on the control stick has the respective same effect. It's difficult to explain how the controls goes, here is one underside view. Go to the instruction by following the link above for more. central rod controls the front back inclination of the swashplate, the exteriors ones controls the left/right movement. The collective stick makes both of the 3 rods go up and down. the motorization integrate a clutch on each engine for safety, and for the same safety reason I place a link between the two blades: top view: Don't forget: there is one hunter in the EB sky: Video final words: This was a great and fun build time! I am happy with the final results. I would like to thank @Ivan_M for creating instructions of a great quality. Thanks to those of you who already build it and give kind returns.

@Jim Entry topic is still locked. i'll be out for work this week, if i cannot post my entry today it will be post next week, and maybe a little late. Ok for you?

This build capture perfectly the spirit of this hystoric birds. Well done! ps. it's a great thing you managed to balance it in order to fit on it's Wheel.

sorry maybe i've been misunderstood. I asked myself if this new set will be in a similar size than my existant truck. It could be a good Reason for me to spend some money in it

can someone confirm that the car transporter is in a correspondant scale at this one? https://www.eurobricks.com/forum/index.php?/forums/topic/151421-moc-european-garbage-truck-new-video-and-lego-idea-submission/&page=2

I think the only way to solve your problem is to avoid the gear solution. The best way is to use , as in real life, some link based on ball joint connector. Look at mack set or some unimog models. This way the physical link will keep stable whatever the axle position is.

This model isn't that complicated. I can make ldd model if you want. It can be done quite quickly. Max 600 parts I think.

No idea for the reference model Thanks for comments, i thought this topic asleep for a while

good build The only unsignificant little thing i see in your build is that the swashplate movement are inverted compared to the respective joystick position. That is not that important thought. BTW, if your model was build in real life, the front action on the stick would make your airplane go … to the left side (physics bizzarery named gyroscopical precession). Strong entry!

Contest are for fun first… No problem with that

I didn't understand, based on picture, that your model was so big! it looks pretty cool to me the hunter is already a big model... BTW, thanks for your kind comments it's well the first time, I think, that a guy post the picture of another contestant in the same contest! I like this blue color also. So now we have a white one, green (on rebrickable) , blue. Still missing black ops version. Who will be the next?

Car transporter has stud full cab. Strong @efferman inspiration according to me. No opinion on spider crane nor crawler. Insane price tag for the excavator.

some try at pop up visual to prepare the final review: @Jim when do you think unlocking the entry topic? I will be out of land for a job travel during the finishline of this contest and i would like posting it next Week...

looks good. some point so far: -is it possible to speed up a little the main landing gear movement? -Don't you have some structural issue? the global frame and particulary the external wings seems a little flimsy ? Keep it up!

I do not agree with this. From a technical POV @Thirdwigg is right, gears are a cleanest solution. But on this particular project i think that the design aspect has to take the lead. The only issue to avoid is to get to much friction in the belt linkage system. The second point is that they will not be a pitch control on this one, but it is not that bad i think. Keep it up!

So there is one more hunter in the EB sky. I am just honored you build it so no problem to post here. If it goes this way this topic is going to turn into a mod en and improvement one

Modern delta planes use two extra ailerons. In French they are called 'canards. They are located near the cockpit in front of the engine air intake. See euro fighter typhoon or French Rafale. Maybe a goog add to your model?

So these shock absorber will remain in yellow. Thanks for the info.

Who cares? I find you capture proportion in a great way so far. From an aesthetic POV I would reduce the gap between front propeller and the engine cover by one stud. Good work!

Hello. Don't forget that this model integrate a collective pitch control

if you decided, by chance, to publish instructions (ldd is enough, this one is first on top of my list of moc to build I just sort all my leftover parts and actually it seems ok... keep it up Igor!