falconluan Posted March 19 Author Posted March 19 Now it is finished! Instructions at: https://rebrickable.com/mocs/MOC-256008 Introduction video: Feature introduction: Some more pics: Coming plan: Will make some crude implements to further demo its functions Also I want to make a C+ version, however, due to the C+ connector cannot be stacked, it will be driven by only one C+ L motor, need to adjust reduction ratio to have enough torque, it weights 1.8KG, hope that one L C+ motor can drive it fine... Quote
1gor Posted March 20 Posted March 20 What is the gear ratio for low speed (AWD) and for high speed (RWD)? Quote
falconluan Posted March 20 Author Posted March 20 Thank you all for your kind words On 3/17/2026 at 8:38 PM, Thirdwigg said: Well done with all the part placement. The tracks look perfect. I think that's because I've practice some times in my T8, magnum half track and the 8RX MOCs Quote
falconluan Posted March 20 Author Posted March 20 1 hour ago, 1gor said: What is the gear ratio for low speed (AWD) and for high speed (RWD)? High speed/RWD: 12:28, 20:16 to the 62.4mm tires, so it's 15:28(0.53)to the rear tire Low speed/AWD: 20:28 to the central diff, then the same ratio to rear tire, result is 0.38 to the rear tire. From central diff to front tire, 12:20, 12:20, 12:28, about 0.11 to the front 107mm tire, I know the wheel speed diff is too much here, just to let the low speed gear runs at a lower speed and the front tire gets more torque... If gets rid of one 12:20 pair gears to the front axle, the ratio will become 0.18 to front tire, wheel speed will be more balanced while speed diff between gears will be less... Quote
1gor Posted March 20 Posted March 20 (edited) I see; AWD have based on Sariel's calculator at 9V final ratio 6.5:1 giving 41.85rpm speed at front axle and 84.24 N.cm torque... My Fastrac is a little bit different...but that is another storry... Edited March 20 by 1gor Quote
falconluan Posted March 20 Author Posted March 20 2 hours ago, 1gor said: My Fastrac is a little bit different...but that is another storry... Fastrac has equal size of front and rear wheels which is a little bit simpler to deal with. Quote
1gor Posted March 20 Posted March 20 2 hours ago, falconluan said: Fastrac has equal size of front and rear wheels which is a little bit simpler to deal with. Yes if you are building 4000 or 6000 series, 8000 has different sizes (front are perfect from CLAAS Dominator...) Sorry to derail your topic... Quote
falconluan Posted March 20 Author Posted March 20 2 hours ago, 1gor said: Sorry to derail your topic... No worries at all Quote
SNIPE Posted March 20 Posted March 20 For the C+ version you could have a conditional step for if we are using third party port replicators, which some companies do sell If not then yeah it can just have one drive motor however the buwizz 3 has 6 ports, 2 of which are PF, idk if a pf to c+ converter cable would work there. Quote
Jundis Posted March 20 Posted March 20 Wonderful to see this thing in its full glory! Looks way better in Brick form than digital. Especially the density on the inside is so cool to see :-) Quote
falconluan Posted March 21 Author Posted March 21 21 hours ago, SNIPE said: For the C+ version you could have a conditional step for if we are using third party port replicators, which some companies do sell If not then yeah it can just have one drive motor however the buwizz 3 has 6 ports, 2 of which are PF, idk if a pf to c+ converter cable would work there. I'm thinking of adding steering to the power split functions as well. By doing so, Pros are can still have 2 driving motors, no 3rd party hardware involved, Cons are can not use C+ L motor's servo function(or need complex programming), steering is lost when switching to functions, high/low gear and AWD/RWD drive modes are lost, large structure change needed 19 hours ago, Jundis said: Especially the density on the inside is so cool to see :-) I like the chassis better than its bodywork myself Quote
1gor Posted March 21 Posted March 21 2 hours ago, falconluan said: I'm thinking of adding steering to the power split functions as well. By doing so, Pros are can still have 2 driving motors, no 3rd party hardware involved, Cons are can not use C+ L motor's servo function(or need complex programming), steering is lost when switching to functions, high/low gear and AWD/RWD drive modes are lost, large structure change needed I like the chassis better than its bodywork myself Yes, chassis is more optimized...one question about PU - could you use gearbox to switch between functions powered by 2 motors? - one would be drive, - one would be pto +drive - other two front and rear drawbar? Quote
falconluan Posted March 23 Author Posted March 23 On 3/22/2026 at 12:31 AM, 1gor said: Yes, chassis is more optimized...one question about PU - could you use gearbox to switch between functions powered by 2 motors? - one would be drive, - one would be pto +drive - other two front and rear drawbar? This is a good direction I think I can configure the two motor with below functions: High speed gear/RWD Low speed gear/AWD Front and rear linkage Aux PTO By doing so, I can still have the benefit of using C+ L motor as servo to control steering Quote
1gor Posted March 23 Posted March 23 10 hours ago, falconluan said: This is a good direction I think I can configure the two motor with below functions: High speed gear/RWD Low speed gear/AWD Front and rear linkage Aux PTO By doing so, I can still have the benefit of using C+ L motor as servo to control steering I had similar idea, only to use 2 PF motors for 4 functions/outputs on one my future model...but first I have to finish current model (when parts arrive and when I order what I need to finish it...) Quote
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