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Bartybum

Eurobricks Dukes
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Everything posted by Bartybum

  1. Bartybum
    A more accurate term would be that it stops the bike from falling over. It won't go straight (because free caster steering alone (with no counterweights) only provides passive stability), but it'll rest in a turning/spiral state and won't go unstable. To go straight you need a feedback controller
  2. Bartybum
    If you can't be bothered making accounts, you can upload to imgur for free
  3. Bartybum
    God I absolutely hate this. It's such a massive waste of space. The way 42009 and 42043 do it is so much better
  4. Bartybum
    Hehe this is coming along really nicely. Looks quite good. Can you document what the effects of changing the damping constant do? Better yet, can you adjust their values on the fly with a potentiometer?
  5. Bartybum
    Anyone thought of a way to improve the sides of the front bumper, where a bunch of the small panels are used? It’s a bit blocky and could do with a bit of smoothing
  6. Bartybum
    @janssnet any chance at a YouTube video? It won’t let me access the Google Drive Bumps in the road are probably better dealt with using softer suspension rather than a software solution I feel.
  7. Bartybum
    You could use fixed axles, but you’d wanna add some form of suspension to help with vibrations in the system. A similar problem I found was that the kP and kD constants had to be reduced the faster you went, or else you’d suffer from speed wobbles and overcorrection. If done right it should react quicker. I had my PD controller scheme target a roll value based on user input. Minus the robot, this is a pretty cool example: You don’t see it in RC bikes because they always use flywheels to stabilise themselves. Much mechanically simpler
  8. Bartybum
    Well isn't that curious. I'm gonna watch this with a keen eye
  9. Bartybum
    It’s not so much the tail fins (although they definitely are way too tall), but rather the green curved panels that annoy me, how square they are and much they stick out without any swept profile.
  10. Bartybum
    Awesome work, thoughts on adding a gyro sensor and making a PID controller handle the countersteering/balancing? I did something similar in Garry’s Mod a couple years back and it works remarkably well
  11. Bartybum
    Oh man I wasn’t prepared for a full paper hahah. How close can you realistically get to a proper airfoil though? On top of that, while a cambered airfoil does produce more lift than a flat plate, you need to lug around a lot of extra weight in the internal structure :S Are you sure the tradeoff of C_L vs required lift is in favour of an airfoil?
  12. Bartybum
    Nah nah I mean the bottoms of the sides. Actually, probably the entire rear needs a redo. It needs to be further in at the bottom, like in a Countach
  13. Bartybum
    $500 for instructions lol what
  14. Bartybum
    I think something that needs improving are the sides at the back. They’re not as angular and inward swept as they should be.
  15. Bartybum
    I assume you’re talking about the AAA train hub. That thing only has two ports, and because there’s three motors, you’d need to sacrifice the gearbox and tipping functions. Can’t say I have, but I don’t think it’d be too hard to do. They’d probably work fine, but you may struggle for torque. I think the gear ratio would be slightly different. The input gear would be 20z instead of 16z.
  16. Bartybum
    Yeah, agreed. It'd be best to restrict yourself almost entirely to large flat tiles and baseplates, just to bring that weight down as far as possible and require lighter motors. Kinda like what PeterSripol did on YouTube: Technically you can make a totally functioning RC plane that only has throttle and yaw control, so there's no need for ailerons or elevators, although I suppose the next challenge would be trying to figure out how to implement those. If I were doing this, I'd start from the point Peter left off, try straighten the main wing to make the connections more legal, and then look at adding more control surfaces.
  17. Bartybum
    How did you determine your lift coefficient curve? I'm quite interested in seeing your calculations That 40kph estimate should be at least doubled, if PeterSripol's flying Lego plane was anything to go by Your approach seems really heavy, but I'm really interested in seeing how this progresses.
  18. Bartybum
    Well that sucks, turns out the solution really was that easy. Cheers TLG lol
  19. Bartybum
    @Jurss Ah yeah, that picture shows it pretty well. The engine would need to be completely redesigned for a differential to fit. Could probably be done, but it'd take some effort. EDIT: It seems that some people have already redesigned it, wew
  20. Bartybum
    I thought so too, but I struggle to imagine how you’d fit it in there, given how close it is. If anyone figures out how I’d be keen to see
  21. Bartybum
    Holy crap you’re right, those prices are insane
  22. Bartybum
    Bricklink or S@H?
  23. Bartybum
    @Jurss Because it's fun to discuss what we think needs to be improved. Not that I'm gonna buy this set (HUGE lol at the price), but I think the first five things to improve (in order of importance) would be: more rigid chassis; the amount of flex in the set is crazy, 4-speed sequential gearbox with reverser (or even 4+N+R), lower side skirts, or lower suspension to remove that floating look, opening engine cover, and removable body work. I basically just judge all these 1:10 scale super cars from the lens of 42077
  24. Bartybum
    Gonna jump on the anti-PU bandwagon because it's fun to shite on these dumb executive decisions, but there's two problems with PU that need to be overcome before I'll accept it as my new overlord: I'm worried the code block stuff will deter newcomers to Technic from building RC MOCs, purely as a result of the increased difficulty compared to PF. PU really needs a simpler way to set up custom RC profiles within the app that don't involve having to learn how to interpret and use the blocks. Drag-and-drop sliders/buttons/joysticks onto a blank screen, with simple control parameters to tweak like speed limits, steppers, trim, etc., would go a long way to improving the experience for people who aren't interested in the wider capabilities. The lack of a 4-slot smart hub without batteries, that can plug into an AAA battery box. PU components need to be flexible enough for use in compact builds.
  25. Bartybum
    It's definitely not so sophisticated that it justifies a 150% price increase though. It's literally just a second switch.
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