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Hi, everyone! It’s been a long time since I posted my last MOC on EB. Today I’m gonna show you one of the projects I’ve been working on lately: a flatbed tow truck / US style wrecker. This is the biggest MOC I’ve made so far...And it is packed with loads of features & functions. Some general specs: Weight: over 4 KG Parts used: over 3800 pcs Dimensions: 760mm (L) x 170mm (W) x 220mm (H) It features: - V8 fake engine - Openable doors - Working headlights - Independent suspensions on front axle - Pendular suspensions with shock absorbers on rear axles Motorized functions: There are 8 motorized fuctions in total, powered by 9 PF motors, remotely controlled by 1 IR Controller + 1 IR Speed Controller (channel switching on both controllers is needed), simple structure with no gear box: - 2 XL for propulsion - 1 Servo for steering - 1 M for opening bonnet - 1 M for wheel lift lowering & raising - 1 M for wheel lift reaching out & retracting - 1 M for bed tilting - 1 L for bed sliding - 1 L for winch A video showing all functions: (Original video on YouTube is 60fps, don’t know why it doesn’t work here) I managed to hide all motors inside the chassis, including the one that powers the winch. I’ll talk about it later. Some more video clips: (Again, all 60fps) This is the propulsion motors assembly. 2 XL hard-coupled with 12-teeth bevel gears, and has a total gear ratio of 25 : 9 before power reaching rear-axle differentials. That’s enough torque to propel this heavy truck. Rear axles have pendular suspensions, connected by 3 small turntables. Soft springs are for balancing. Structure is solid enough to bear the load, but I also designed a similar one with extra support on the middle turntable. It’s 1 stud longer so I didn’t use it on this already long truck. This is what the chassis looks like.I was wearing latex gloves for anti-sweating... Eight 200mm-long PF extension cables were used to connect motors to IR receivers and IR receivers to battery pack. They were well hidden right underneath the battery pack. Now let’s take a look at the bed. In the picture above, the arrows indicate how power goes up the bed. Red ones are for bed sliding while green ones are for the winch. I decided not to put a motor on the bed because it is ugly and too big. A real flatbed’s winch motor is fairly small compared to its size and usually unnoticeable. As a result, I have to compromise on deck height... More photos: At last, I have to say I’m not satisfied with this MOC for several reasons: Deck height: just too high for a flatbed. As I will not compromise on a visible motor on bed, height increased at least 3 studs. Loading angle: about 19 degrees, not a good number Most importantly, too long and too heavy. Front wheels and Servo are working under high pressure, even with 3 hard springs on each side the front part is still overburdened. Perhaps an extra pair of wheels in the middle would solve the problem, but it will lose its aesthetics and no longer looks like a longnose US truck. I didn’t want to publish it at the beginning because it’s imperfect, but I spent too much time on it and don’t want to waste it, so finally created this topic and shared it with you. Again, see my other creations on Rebrickable at: http://rebrickable.com/designer/musenkevin And my YouTube Channel: https://www.youtube.com/c/KevinMoo Enjoy!
