A_C Posted May 15, 2021 Posted May 15, 2021 (edited) As inspired by pg5200's Buggy and Tamiya's Fighting Buggy, I've built this RC Buggy MOC. It's simple, fast and stable. Features: - Total no. of pieces is less than 400 - Around 1/15 to 1/16 scale - Requires a BuWizz 1.0/2.0 or CaDA or Mould King remote battery hub (SBrick should be possible by placing the hub on top of the battery box) - PF Servo Motor for the steering - RC Buggy Motor or BuWizz Motor for the rear driving - Gear ratio is 1.4 : 1 - Transverse damper rear suspension similar to Fighting Buggy - Rear camber angle is about +1 degree - Optional 4 LED lights (instruction not included) Instruction available at https://rebrickable.com/mocs/MOC-76795/ Have fun and enjoy! It's not in Minifig scale, just give you an idea of its size. It has a +1 degree of rear camber angle. Edited May 17, 2021 by A_C Added test run video Quote
SaperPL Posted May 15, 2021 Posted May 15, 2021 That's a really good looking buggy, at least it's properly hiding the motors inside the body, but I think you should make a video showing how it works - the gearing matters, so it may be either really slow or won't be able to climb at all etc. Quote
Andman Posted May 15, 2021 Posted May 15, 2021 3 minutes ago, SaperPL said: That's a really good looking buggy, at least it's properly hiding the motors inside the body, but I think you should make a video showing how it works - the gearing matters, so it may be either really slow or won't be able to climb at all etc. From what i can see it could/should be a 1,4:1 gearing. Could reach 2,5 to 4km/h. Not sure about the torque. Quote
amorti Posted May 15, 2021 Posted May 15, 2021 Am I missing something, or does "1° camber" actually mean "I didn't make a strong rear axle"? 2 hours ago, Andman said: From what i can see it could/should be a 1,4:1 gearing. Could reach 2,5 to 4km/h. Not sure about the torque. 56mm tyres * pi for circumference * 1240rpm on a buggy motor at 9v * 20/28 reduction on the differential * 60 minutes in an hour / 1,000,000 mm in a km =9.3km/h With so few parts I'm betting it'll rip. Quote
Andman Posted May 15, 2021 Posted May 15, 2021 25 minutes ago, amorti said: Am I missing something, or does "1° camber" actually mean "I didn't make a strong rear axle"? It's feature, not a bug! 26 minutes ago, amorti said: 56mm tyres * pi for circumference * 1240rpm on a buggy motor at 9v * 20/28 reduction on the differential * 60 minutes in an hour / 1,000,000 mm in a km =9.3km/h I'm tempted to disagree. Looks like the slower output is used, thus 780rpm @9V (According to Philos homepage). That's nearly 6km/h... in theory. But i might be wrong. Quote
amorti Posted May 15, 2021 Posted May 15, 2021 (edited) @Andman you've come from 2.5-4 to nearly 6, but you're still wrong - one of us read Philo's page wrong (it was you). I'd like to know how you get 1° of camber in Lego on purpose, unless it means 1° of slack either direction from square. Edited May 15, 2021 by amorti Quote
Andman Posted May 15, 2021 Posted May 15, 2021 (edited) 12 minutes ago, amorti said: @Andman one of us read Philo's page wrong (it was you). You are referring to the non-loaded characteristics, which is described here: I was referring to the loaded characteristics. 5292 Torque Rotation speed Current Mechanical power Electrical power Efficiency 4.5 V 5.7 N.cm 150 rpm 1.36 A 0.87 W 6.12 W 14 % 6 V 5.7 N.cm 380 rpm 1.38 A 2.27 W 8.28 W 27 % 7.5 V 5.7 N.cm 580 rpm 1.37 A 3.45 W 10.3 W 34 % 9 V 5.7 N.cm 780 rpm 1.40 A 4.61 W 12.6 W 37 % 10.5 V 5.7 N.cm 1030 rpm 1.46A 6.16 W 15.3 W 40 % I'm again tempted to say that the values from table of loaded characteristics are closer to the real life conditions for this moc than the non-loaded characteristics of that motor. Your turn :-) Edited May 15, 2021 by Andman Quote
amorti Posted May 15, 2021 Posted May 15, 2021 Well, it runs on buwizz, so that's 11.2v which would give somewhere over 1030rpm. I'll accept a mutual loss Quote
Andman Posted May 15, 2021 Posted May 15, 2021 4 minutes ago, amorti said: Well, it runs on buwizz, so that's 11.2v which would give somewhere over 1030rpm. I'll accept a mutual loss :-D I didn't read that it is powered by a buwizz. That's a game changer. There is only one solution! @A_C, please make a video and show how fast it can go! Quote
A_C Posted May 16, 2021 Author Posted May 16, 2021 Thanks all for your feedback. First of all, I don't have a BuWizz, and I'm using a compatible Buggy motor only. When the remote battery is fully charged, it has about 8.1V And I've just uploaded a test run video but I cannot provide the actual speed in readings. But I think it's pretty fast, and it's definitely not a climber or crawler. Quote
A_C Posted May 22, 2021 Author Posted May 22, 2021 Just added another yellow version at here. It's not only another color version, but also replaced the expensive light reflector parts. Quote
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