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[WIP] WV Golf Rallye G60
miguev posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello... long time no see I'm slowly getting back to Technic, and got a couple new things to try: BuWizz and SBrick+ ─ in this MOC, I'll try pushing the limits with BuWizz to drive a heavier model faster than Li-Po + SBrick can. The model of choice is this VW Golf ─ a popular sports car around my early teen years: I'm not entirely sure which model exactly is this (please let me know if I got it wrong) but it looks like it's the 1990 VW Golf Mk2 Rallye G60, indeed the Nicest One Left. Scale will be roughly 1:10 (1:9.72) as calculated using this blueprint (closest match I could find) and Sariel's model scaler assuming 62.4mm tyres. Initial goals for this model: Fast enough to be fun to drive and appreciate suspension at work. 4WD with either central differential or separate front / read drive trains. Front and rear independent double wishbone suspension. Caster angle (for real this time, not fake like in my BJ Baldwin trophy truck). Reasonably good looking body work, but lightweight. Reasonably good looking interiors, with only front seats like a real rally car. Openable bonnet and boot. A few lights. Stretch goals, harder (maybe unfeasible) at this scale: RC 2-speed gear box. Automatic 2-speed gear box. Working steering wheel. Openable doors. A lot of lights. Brakes, at least on rear axle. McPherson front suspension and dragged rear axle, like the real car. I'd like to hear from the more experienced among you, if any of the above is a bad / silly / unfeasible idea. Or if there is something else I should try, or take into account. For the front axle, I'm using 32495c01 wheel hubs (from 8070) to keep ground clearance at around 2-2.5 studs. Made a fairly compact axle, to be able to mount it at an angle, with a slightly illegal alignment (off by 0.4 mm) to achieve a small caster angle of 5.7º ─ is that too little for this kind of car? Drive train is not finished yet, and for now I'm trying the easy way: separate drive trains for front and rear axle, with 2 L motors per axle geared up 1:3. With just the front axle so far, BuWizz is able to drive this at a decent speed with a bit over 1 Kg. of load (model weighs 550 g. and I tried it with a 500 g. package of flour on top). I'm hoping there will be enough power to drive around 1.5 Kg. of model with 2 axles like that. The thin 3L LBG liftarms between suspension arms and steering links are holding a round 1x1 plate to keep the CV joints to pop, otherwise they come apart under stress. The not-so-easy way I have in mind would be 2 Buggy motors going to a central differential, maybe with a 2-speed (RC or automatic) gear box in between. I have not yet tried anything for this. So far I have a chassis built with bricks, half of which is just scaffolding for the first drive test. Since I wouldn't have decent photos any time soon, I built in MLCad the part of it that is not scaffolding and took a few snapshots: A few more snapshots in a Flickr album. Looking forward to reading your comments and suggestions