Jeroen Ottens

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  1. Great review Jim. It is a nice change from the criticism that usually is expressed in this forum. You almost swayed me into buying this set, but even with my budget I feel this set is too expensive (I also don't have any yellow models in my backlog at the moment). But maybe I'll pick it up with a good discount some day.
  2. Jeroen Ottens

    [WIP] Lexion Combine harvester

    Time for another update. I have been struggling with the structure of this beast. I like my models to have some internal structure that is strong and sturdy, while using a minimal amount of parts. There should be some logic to it. But in this model I just couldn't get a feel for how this structure should look like. So instead I started to play with panels to get the outer contours somewhat right. Hopefully this will help with fleshing out the inside. So here is the first attempt at some bodywork: The proportions do not feel completely right yet (the white area is maybe a bit too long). This thing is going to be massive! I underestimated the size of this thing severely (which also explains why I couldn't get a grip on the design of the internal structure). It is currently 65 cm long, adding the header at the front and the spreader mechanism at the back my guess is that it will be 80 cm long in total. If I would add the biggest header this thing can handle it would also become 80 cm wide . Which is similar in size as my F14 Tomcat... I may have to add some more functions to prevent it becoming an empty box like the 42100 . The eagled eyed among you may have noticed a big turntable in the track. That is correct, I am reverting back to the pendular suspension on the tracks. This is the only way to get enough room for the actuators to lift the header. As a consequence the diff of the tracks is now suspended and can not be locked anymore .
  3. I agree to most what is said. Designing in a modular way is easier and makes the model talk more coherently to the builder, but in the final model the modularity can be compromised to avoid bulky connections. I think the 8448 had the advantage of having a studfull frame. There are so many more compact ways to connect modules in that system. This is indeed a severe challenge. The 42056 has a mod that can achieve this and I only managed this once (Il toro azzurro has detachable bodywork). Both of these cars are still relatively boxy, coincidently both inspired on designs of the 50/60's...
  4. Jeroen Ottens

    [MOC] Hennessey Venom F5

    Here you go:
  5. Jeroen Ottens

    [MOC] Hennessey Venom F5

    Actually the black A-pillars were modifed after the photoshoot. In the final model they are more horizontal, following the lime flexaxle more closely. It does lower the stiffness of the roof a bit, because the angle is now shallower, but it doesn't look so weird anymore.
  6. Jeroen Ottens

    [MOC] Hennessey Venom F5

    My bad. I used the wrong custom list . The link should now be right (and visible): Ottens/lists/124358/
  7. Jeroen Ottens

    [MOC] Hennessey Venom F5

    Thx. The photos are made by Fredric Landragin. He is a real genius with that. Ah, the list was still private. Should be fixed now.
  8. Jeroen Ottens

    [MOC] Hennessey Venom F5

    Good to hear you enjoyed the WIP. More photos can be found on Flickr, but here is one of the rear
  9. Hi, It has taken a while, but I can finally present my 1:8 scale Hennessey Venom F5 replica. It has the following features: - Independent suspension on all wheels - Working steering wheel - Scissor doors (operated through HoG gears behind the chairs) - A 8-DNR sequential gearbox (based on the compact gearbox of @Anto, operated through a HoG behind the rear numberplate) - A detailed twinturbo V8 engine - Semi modular build The real thing is quite a curveous animal, so it was a fun challenge to try to replicate those curves with the existing parts. I am especially pleased with the front fenders. Those new triangular panels from the Sian just were perfect for this. Speaking of the Sian: I optimized the design towards using the Sian parts. Over three quarters of the parts come from the Sian. If you are interested, instructions are for sale on my website. It was great fun to design this model and I'd like to thank all the Eurobrickers that helped with their feedback during the design process (and @Ivan_M for the high quality instructions).
  10. Nice different project. As a suggestion for the reel you can maybe use wheelrims. They come in all kind of diameters.
  11. That is a beautiful beast. I am always amazed at these rope shovel excavators. Some nostalgia to the times that mechanics ruled the world I guess. If I am critical I would say the video is a bit long and repetitive. And I can imagine that you wanted to make the body with system parts. Adding more details to such a big area would have helped to make it more than a yellow cube, but budget constraints are a perfect excuse. Maybe stickers as a cheaper cop-out? Do you have any issues keeping the ropes on all the pulleys? And how is that bucket opening rope independent from the arm elongation?
  12. Jeroen Ottens

    [WIP] Lexion Combine harvester

    That will connect to the steering motor Ah, my bad. I indeed tried to use that for the pivotpoint, but that made for a very bulky solution to get it stiff enough.
  13. Jeroen Ottens

    [WIP] Lexion Combine harvester

    Here is the link to the patent: The small turntable will not work because the grey hexagon rotates on a virtual crank, which means it needs a central hole of at least 3 studs. Which is exactly the size of the hole in a large turntable. I found it really difficult to wrap my head around it, even with the patent pictures. Don't be, just copy what you like
  14. Jeroen Ottens

    [WIP] Lexion Combine harvester

    After being reunited with my bricks I was able to make in bricks what I had been thinking about in my head in the past week. Here is the reel mechanism: The reel is the big red rotating spidery thing at the top of the header. In 1935 a patent was filed to keep the tines (that are the vertical sprung wires that stick out) vertical during the rotation of the reel. That has been in use ever since. As you can see the tines (the LBG 3L half liftarms) are all vertical on this reel as well. The way it works is that there are two hexagons (a red one from the reel itself and a LBG idler hexagon). These two hexagons have a one stud offset. Six cranks are used to couple the two hexagons to each other. The tinebars (or axles in this case) where the tines are connected to are hard coupled to the cranks. By rotating one hexagon, the other is taken along and the cranks stay horizontal during the whole cycle and therefor the tines stay in the same (vertical) orientation during the cycle as well. Easy to understand once you see it working, but I needed to find the patent before I could wrap my head around how this mechanism works. I made two versions of this, one uses the big turntable at the side. The advantage of that is that the central axle of the reel can pass through the idler hexagon and the drive can be on the outside, like the real thing. However it looks quite bulky and it has a lot more friction, so I decided to go for the better playability. This means that the drive will be somewhere in the middle instead. I also did some more research on the Terra Trac. On the Lexion there is no 'headland protection', ie the front idler of the track doesn't lift when steering. Instead the whole track pivots around its center point. Now I am in a bit of a pickle. It will be a challenge to create a pivot point that is sufficiently strong to carry the weight to tracks without the tracks bending sideways. Plus I loose the cool lifting mechanism... So I'll give the strong pivot point a try, but if that proves too difficult I'll revert back to a less realistic, but cool front idler lift only. ... trying different pivot solutions... all too bulky or too flimsy... So here is the 'headland protection mechanism': The yellow axles are for the steering of the rear wheels and the lifting of the front idler. The steering axle can rotate 90 degrees either way. As a result the yellow 5L beams will be lifted one stud by the black 36T gears independent of the direction it is steered. The black 36T gears are driven. This way the load on the tranversal yellow axles is minimized. The four DBG 9L beams are needed to fix the beam between the front idlers in x,y, Rx and Rz. Ry is fixed by the two 5L beams, so only z is left as a degree of freedom on that front axle.