clarkdef Posted December 28, 2015 Posted December 28, 2015 Hi guys I'd like to share with you my latest buggy "Grass Hopper" I built it for track racing in the back yard. The goal with this buggy was strength, not having to run to the thing to fix it, I could not achieve this without using screws :) Below is a video showing me put the buggy through some tests, I would like to make a standard test system for Lego RC cars to adhere to, let's discuss what they should be! The tests in the video are below. It's shouldn't be all about speed so a towing test could be cool and the looks of the car should be a focus as you might want to display the model while charging :) - Bump test I use a hose (something we all have) to test how the suspension controls the chassis, a pretty simple test, someone might have a better idea as one bump might not be enough. - 45 degree incline test Skate park ramps are 45 degree so I went to a skate park, (it is also crazy fun driving around them). - Acceleration test over 8m I choose 8 meters because it's easy to frame in video and it's the standard length of a general tape measure which is easy to reel out. - Top speed Pretty easy now days just find an app and sellotape your phone to the car, though I don't know how accurate the apps are. Builders who gear for high speed will do poorly in the accel test and builders who gear low will do poorly in high speed tests. Quote
Damndog Posted December 28, 2015 Posted December 28, 2015 wow i have not seen a model with four RC motors in before must have some serious power what battery pack do you use Quote
z3_2drive Posted December 28, 2015 Posted December 28, 2015 Great MOC, I'm most impressed with the performance on inclines, full wheelspin all the way up and without stalling! Nice job and good video Quote
BusterHaus Posted December 28, 2015 Posted December 28, 2015 The purist in me winces at the screws while the rest of me cheers it on. I like this MOC quite a bit. The performance looks very good and it seems like a blast to drive. Did you damage any axles with all that power? Quote
M5Technic Posted December 29, 2015 Posted December 29, 2015 are you using the lego rc system or a 3rd party controller system? either way amazing buggy and by the looks of it the most fun to drive little beast ever seen Quote
clarkdef Posted December 29, 2015 Author Posted December 29, 2015 (edited) wow i have not seen a model with four RC motors in before must have some serious power what battery pack do you use I use a Rhino 750mah 2cell it weighs 50ish grams, great little battery I have abused the heck out of it and it serves well. Great MOC, I'm most impressed with the performance on inclines, full wheelspin all the way up and without stalling! Nice job and good video Thanks! it is very light, I did have bigger wheels and tires on it, but when I put the smaller ones on it really got lively, however I am not happy with ground clearance. The purist in me winces at the screws while the rest of me cheers it on. I like this MOC quite a bit. The performance looks very good and it seems like a blast to drive. Did you damage any axles with all that power? The screws don't wreck the pins, they merely fit in meaning the pins can't come loose, really a must for staying together. Axles are fine I keep all rotating parts greased, however the big Technic frame holding the front subframe on is got a few fractures, a shock absorbing bumper needs to be developed. which will be be a fun problem to solve. are you using the lego rc system or a 3rd party controller system? either way amazing buggy and by the looks of it the most fun to drive little beast ever seen Yes I am using a TRex motor control and futaba receive/trans. I used to use the old lego rc unit, it is too unreliable and large, also it has limits of only two motors. I wanted something with decent range too. It's really fun I want to compile an on board video :) probably this weekend, I'll upload and update when I have. For those wanting to know about the motor controller and transmitter/receiver the ground work was laid down by z3_drive here is a link to his original thread on everything you need. http://www.eurobricks.com/forum/index.php?showtopic=88960 Edited December 29, 2015 by clarkdef Quote
Chade Posted December 29, 2015 Posted December 29, 2015 Awesome buggy, but the screws make me cringe as well . It certainly has a lot of power! Love to get my hands on some buggy motors. Quote
AndyCW Posted December 29, 2015 Posted December 29, 2015 Awesome. I'm not a big fan of the rear suspension setup, but other than that it seems pretty lively and entertaining. You mentioned greasing the axles. What do you use for grease? v/r Andy Quote
clarkdef Posted December 30, 2015 Author Posted December 30, 2015 (edited) Awesome. I'm not a big fan of the rear suspension setup, but other than that it seems pretty lively and entertaining. You mentioned greasing the axles. What do you use for grease? v/r Andy No neither am I, mainly because the motors are too close to harms way, and it simply doesn't work! I'll try another system out tonight. I use grease that you use on real car wheel hubs lol seems to work I'll post tonight my method. Edited December 30, 2015 by clarkdef Quote
Billant Posted December 30, 2015 Posted December 30, 2015 Wow that's quick. Shame those Rc motors have such a price tag. Quote
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