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  1. YAPT (Yet Another Peterbilt Truck :) After recently catching the AFOL bug I found myself spending alot of time admiring Bricksonwheels' creations and Sariel's road train. Then after building one of Ingmar's trucks, I felt compelled to build my own. So here it is. Since I already build a lowboy trailer very similar to Ingmar's detachable gooseneck design in yellow and black, I went with a yellow and black color scheme for the truck. The truck has 5 PF motors. 2 XL motors for drive. Servo for gear rack steering. M-motor attached to a PF switch allowing remote control on/off of all the lights. This design is very similiar to the one found in Madoca's wing-body truck. The truck has head lights, tail lights, roof lights, as well as a PF connector in the back allowing the trailer's lights to use the same remotely controlled switch. An M-motor is used to lift and lower the third axle. Originally I made the truck with a two speed gearbox very similar to the one Madoca used in his SUV Mk II. Since the gearing allowed the truck to be rather fast and zippy in the faster of the two gears I decided to use dual XL motors for the drive. But after finding a few too many false neutrals with the torque of dual XL motors, I've since removed the gearbox. Now it seems that two drive motors are a bit overkill unless you're pulling a heavy trailer uphill. To make it a bit unique I set out to give it a third axle which can be remotely lifted and lowered. All wheels utilize technic shock absorbers. The cabin can fit a full size battery or the smaller rechargable one. From the top, it's 59 studs long. The two PF connector's just ahead of the fifth wheel are or for continuous power to the trailer and remotely controlled trailer lights. Here it is pulling a heavy 42030 Volvo wheel loader. Yellow overload. So originally I had no plans to make instructions, but once I started playing around with LDraw and Bricksmith, I just couldn't stop :-) The full instructions are available on rebrickable http://rebrickable.c...ellow-and-black The truck is up on MOCpages More pics are available on bricksafe Peterbilt 379 Many thanks to Aurimax https://www.bricklin...e.asp?p=Aurimax for the Chrome pieces.
  2. After many delay, now I present my new big MOC, It was in LFW in Skaerbaek. Since I was a child I has been a fan of big trucks, and specially of American style trucks(in Spain is strange to see trucks with long noise). For this MOC I have chosen one of the most charismatic and representative models of these trucks: a Peterbilt 379. Also I have endeavored to put a version of CAT C15 engine (I'm also a fan of the brand CAT). This MOC is made in a 1/10.2 scale, giving a final size of 31 studs width, 99 length and 40 high. Here you can see some pictures taken in Skaerbaek where you can appreciate the size, there are: this Pete, the Crow's Vampire GT(scale 1:10 too...), the Nathaniel's Supercar and my Veyron. The total weight is 5.5kg, and has been one of the main problems I've had. Front axles deforms and look like the wheels has huge camber angle. This is a esthetic defect which I hate, but it has not solution if I want to keep all functions and therefore the weight of the truck. I will try to fix it comming soon. The electric system is huge, and it has: - 2 AA PF battery boxes - 4 PF IR recievers - 5 PF XL motors - 5 PF M motors - 1 PF switch - 3 PF large extension wires (50cm) Probably, the most “wanted” picture for Lego Technic followers: CAT C15 Engine Under the hood you can find a replica of the CAT C15 engine, with its 6-cylinder in line. The engine doesn't have the sides covered to appreciate that the cylinders are located in the same order as the real engine, with 120 ° intervals between them. Getting those 120 º between cylinders was very complicated but I thought it was necessary to be more faithful to the original. The engine also has a motor M to rotate it, which is connected directly to a battery. Between the engine and the M motor there are a differential, which is also connected to the drive motors, so that the engine is always at idling, but when you starts the drive motors the C15 accelerate adding both speeds. The rotation speeds grow up from 250 rpm up to 700 rpm aprox. Pneumatic system After almost 10 years without using pneumatics in any of my MOCs, I decided this was the perfect model to use it. The pneumatic system the truck runs along the complete truck, mainly controlling the suspension and brakes on all axles. The pneumatic system is composed mainly: - 2 Small pumps (6L) - 1 Large pump (for emergencies). - 2 Air tanks - 7 Small cylinders - 8 Large cylinders - 7 Valves - 1 Manometer (LEGO part n.64065) - 22 T connectors - And about 5 meters of pneumatic tube in 3 colors: blue, black and light gray. All pneumatic control is located on the right side of the truck inside the fuel tank. Also in the cab, between the seats, there is a manometer to measure the system pressure, it is very useful to know how much air have you at any moment. Axles As the real truck it has live axles. Both rear axles are driven without differential between them. In each axle between the differential and the wheel the axls has gear ratio 12/20 to reduce necessary torque in the differential and protect bevel gears. The front axles uses the same steering system as the real Pete, of course the steering wheel turns too, also it turns 4 laps, again as the real Pete - Suspension The suspension is fully pneumatic in all axes, and it doesn't use any spring to help. The front axle has 4 big cylinder and each rear axle 2. - Brakes The brakes as the real truck are drum brakes, there are a drum on each side of each axle, all of them controlled by a small pneumatic cylinder. The control of these pistons are made through two valves, one for the front axle and one for the rear axles. For normal braking the brakes operate all at the same time, but only while you are keeping push the brakes botton. But you have also parking brake mode, if you push the brakes botton in the opposite direction only rear brakes works, and they will not disabled if you stop pressing botton. To remove the parking brake you only need use the normal brakes. - Auxiliar output Behind the cabin there is an auxiliar pneumatic output(blue connector), where you can connect anything you want. The valve to activate it is located before the rear-right wheel Transmission The transmission is the biggest mechanism of the truck, and it has an approximate size of 25x7x45 studs. It uses 4 XL motors for drive. The transmission has 18+2R speeds(this is true, is not a joke...). The transmission is divided in two parts: the main gearbox with 9+R speeds with automatic clutch(this gearbox is based on the LR Defender), and a transfer case with 2 speed (H and L) Joint both gearboxes the result is this: RL-1:0.261 RH-1:0.29 1L (1) - 1:0.324 1H (2) - 1:0.36 2L (3) - 1:0.432 2H (4) - 1:0.48 3L (5) - 1:0.54 3H (6) - 1:0.6 4L (7) - 1:0.72 4H (8) - 1:0.8 5L (9) - 1:0.9 5H (10) - 1:1 6L (11) - 1:1.2 6H (12) - 1:1.33 7L (13) - 1: 1.5 7H (14) - 1:1.67 8L (15) - 1:2 8H (16) - 1:2.22 9L (17) - 1:2.5 9H (18) - 1:2.78 Auxiliar electric output As I said before, the truck has an auxiliar pneumatic output, but also it has an auxiliar electric output too. There you can connect anything you want, and control it with the remote controller. To avoid leaving this connetor without any use I have added a fifth wheel(trailer connector). - Fifth wheel Note: right now I don't have intention to do a complete trailer. It is very simple and effective. The kingpin diameter is 1 stud. Finally as always, you can see a complete video with all features showed: For more detalied information visit I hope you like it!!