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Hrafn

Eurobricks Knights
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Everything posted by Hrafn

  1. Hrafn
    Oh no! I hope you heal quickly. When I broke my wrist, the doctors told me protein helps speed the healing of bones, and that did seem to be borne out by my experience.
  2. Hrafn
    Quite true. Someone who was willing to mod parts could put an axle connector on a drill and sand one end down so that it tapers and could be used to self-synchronize. Could you explain what you mean? The neutral wasn't intentional, it just emerged from having to have 2 axle connectors. I'm not sure how you could get rid of the 16t gears.
  3. Hrafn
    I don't have access to my bricks to test it, but I think this will work. It's not synchronized, and requires a long throw to switch gears. The two axle joiners are not connected by an axle. When the driving ring is on both of them, the input:output ratio is 1:1. When the driving ring engages one or the other of the clutch gears, the ratio is 12/20 or 20/12. When the driving ring is centered on one joiner or the other, it's in neutral. Obviously 8/24 pairs could be used as well, or 8/8/8 for reverse.
  4. Hrafn
    I agree! Are you building a WRX?
  5. Hrafn
    Off by just 0.6mm! 80mm in one direction, 9.6 in another; sqrt(80*80+9.6*9.6)=80.6mm and the beam is 11L so there are 80mm between the centerpoints of the end holes. There's probably no 'legal' way to do this since the boom section is so narrow.
  6. Hrafn
    How big are the poles relative to the robots and the arena, and are they taller than the robots? Are there any height limits on the robots?
  7. Hrafn
    From the perspective of someone who only buys sets for parts, 42038 is the winner for me if the price is right. Tons of orange panels, tons of black track links (and 12 black sprockets!), and it looks like 2 c-frame/ball joint assemblies. Maybe 42037 for the lime parts. 42035 is a good source for those new tires, and the model looks great, but I have plenty of yellow. I'm glad to see the range of colors they're using for 2015! My only regret is that while there are going to be a ton of medium blue panels now, there are almost no liftarms in that color. 42022 and 42036 each have 2 of the 7-3 bent liftarms - and that's it. Those wanting to build Gulf Oil-liveried GT40s and Porsches will have to use System parts as well, or leave their MOCs somewhat skeletal.
  8. Hrafn
    I love it! The front mudguards are very clever. The whole thing has a sort of Lancia Stratos feel to it, which is never a bad thing.
  9. Hrafn
    The 5L suspension arms have been used by others as steering arms. It's tricky to get it to work since one end only has one degree of freedom, but might be an option.
  10. Hrafn
    Uni-knick?
  11. Hrafn
    Nice! Simple and clean. I'd hate to drive a real-life version, though - imagine the handling when the motor is part of the unsprung mass!
  12. Hrafn
    Philo has a lot of information about this (and other Lego motors) here; his summary of the E-Motor is: "Introduced with LEGO Education Renewable Energy Add-On Set (9688), the strong point of this motor is that it can be easily back-driven and used as a generator. Its high speed may be also useful in some applications. But its efficiency is no better than PF-Medium, and delivered mechanical power is about half." So as others have said, it's easy to use this motor as a generator. But it's not very good when actually used as a motor to power machines and vehicles.
  13. Hrafn
    Check out Piterx' sequential gearbox idea (post #36 here). It's the most compact non-servo solution I've seen.
  14. Hrafn
    Consider it an opportunity, rather than a problem! Lego will be there whenever you want to return to it, but college can (and should!) be a tremendously valuable experience, both in terms of academics and personal growth and exploration. Have fun, try a lot of new things, and get to know a lot of different people. You'll make lifelong friends and memories. Back on topic, I like your chassis but the proportions are a bit off for a supercar (or a non-super-car), at least with those wheels. I suggest going with smaller wheels (maybe the new 49.5x20 tires). Most cars have a wheelbase of around 4-5 times the diameter of the wheels. Your wheelbase looks to be about 23 studs = 184mm, so tires of diameter ~45mm would be about right. The ratio of width to length looks good if slightly narrow.
  15. Hrafn
    Those are some nice NACA ducts!
  16. Hrafn
    I love the way you have one gear control two functions by both tilting and rotating - very innovative!
  17. Hrafn
    If you use vinyl dye, please read the MSDS (Material Safety Data Sheet) carefully, and use appropriate safety equipment and procedures. This kind of dye contains some nasty toxins, like toluene, and may be carcinogenic. A quick search found one that says, in part: May cause nervous system depression. Extreme overexposure may result in unconsciousness and possibly death. Prolonged overexposure to hazardous ingredients in Section 2 may cause adverse chronic effects to the following organs or systems: the liver the urinary system the cardiovascular system the reproductive system
  18. Hrafn
    Unreal. I had no idea people were that crazy for minifigs. 2kg of black bricks + 2 new (but very wide) tires + 2 3x11 black panels + 4 Unimog tires + no functionality does not equal $200 of value for me, not by a long shot. Even selling the figures off for $50 each wouldn't make it worthwhile, IMO. I'm very puzzled why Lego didn't at least add steering. AFOLs have shown it can be done well at smaller scales than this.
  19. Hrafn
    Thank you for sharing this, it's quite ingenious.
  20. Hrafn
    Do you mean the 10.2mm diameter ball joints ()? I've used those in some suspension experiments and found two things. First, the standalone ball joints are no good because they pull off the axle when subjected to any tensile load; it's better to use 50923 or 64276 . Second, the ball joint sockets (like this one ) have too much friction to be used in suspensions (except maybe for very large, very heavy vehicles); fortunately the balls also fit nicely between two liftarms spaced 8mm (1 stud) apart, and in that configuration the ball joint can move smoothly.
  21. Hrafn
    What scale, and what wheel size, are you looking at using? Vehicles under about 1:10 scale (or with wheels smaller than the 62.4x20 ones) tend to be too small for advanced suspension geometries, custom kingpins, etc.
  22. Hrafn
    Welcome to Eurobricks, and this is a great truck. The ground clearance is impressive - I'd love to see it in action.
  23. Hrafn
    I like it! Nice and compact. I assume you get some bump steer since the steering links aren't the same length as the suspension arms, but it's probably not much of an issue. How did you connect the steering axle to the sliding steering "rack"?
  24. Hrafn
    That back is gorgeous! I was excited that you were tackling this project but worried that it wouldn't work out since the Stratos has such a complex shape, but this is outstanding.
  25. Hrafn
    This thing is a beast! I'm impressed with how well you've packed the motors, batteries, and steering in there. Looking forward to seeing your continued progress! How are you going to do all the curves in the bodywork? Flex axles, or liftarms, or brick-built?
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