Permo

Well last year the whole competition got ignored and a price for the winner is also ignored,... so who really cares ? Comming from you, I feel that's a great compliment to get, thanks ! Yes a intravinous speed injection is probably a wise thing to do before hitting the gas with this puppy, so body and brainfunctions are up to par with the car. The frontwheel breaks are not on the hubs (as that would not be strong enough working against the power of 4L motors on 12V steroids), but directly on the tire with the 2L rubber connector for good grip. Some details of the meganism; I was really surprised I got it working without colliding with the pretty sharp steering angle this ride has. About the testbench; It is a completely passive system, driven by the car that is on it, a pair of rollers for the rearwheels to sit on drive a pneumatic pump, the pump raises the 'crashbar' in ront of the vehicle, a pair of exhaustfume sution fans are driven also from the bench and there's a manometer reading total system pressure wich maxes out at 50psi. Sorry I don't have video as I don't own a camera, the MOC has allready be taken down as I started some new experiments, and I have only 3 sets (2x crawler and a Porsche) so I need those parts...

So there it is, my 'illegal' entry to AMS2, wich is illegal because it uses a rechargeable (LiPo) battery instead of the Lego 6xAA batteryboxes wich are drained very fast, expensive and bad for the enviroment, so I don't use them, purist rules are ok untill they stop making logical sense and become outings of total OCD only. Eat Dust ! Big enigines need big tailpipes. Pneumatic lifting of the bodywork to acces tech area, it can also ride in this position but it is not recommended. As there is no suspension in the chassis the pneumatic coupling of the bodywork still garantees a smooth ride. A souped up engine needs lots of extra dials and gages and stuff to keep track of all the added systems, no pair-a-dice by the dashboard light but a trofee pair of worn out pistons, behind the steering wheel there is also a siringe mounted to the dash, I still don't know what's in it, but knowing the driver it's probably heroin. Big supercharger added. Extra cooling for the engine Just like a real dragster it can lock the frontwheels (pneumatic breaks) to do a tire warming burnout in place, with 4L motors driving the rear wheels only doing a burnout, drifting and doughnuts are no problem at all as long there is a flat surface to ride on (no carpet), there is also a magnetic reedswitch wich engages the 6 orange blinking LED's as a warning when the frontwheel lock is engaged. The (pneumatic) break pedal is actaully working, though you would have to push it a 100 times to engage the breaks, in the rear there is a electrical pneumatic pump keeping pressure on the system, but when electricity is down it can still be manually pressured by the breakpedal. It maxes out the testbench in 5 seconds... So dragsters are highly illegal, don't use standart engines and chassis in general, anything goes as long as it's fast, so I think I did a perfect rendition of a dragified Lego set with this build. More pics here; https://bricksafe.com/pages/Permo/crazer-

Big bad front axle experiment, 8 studs suspension travel, 30° steering (2 stud rack travel boh ways) pneumatic tightening or softening of the suspension, slackless wheelhubs that will fit 3 hole rims, direct drive from 2 L motors wich are semi suspended. So far it holds up well during testruns, but I will have to do some re-design to get better mounting options attaching it to the chassis. Cheers!

Very cool !

Not to clutter the topic, but this might be interesting for your buggy also; The two large balljoints connect to the suspension arms, the two connectors allow for double steering rods for extra rigidity. Not 100% correct allignment of the axles, but the way they are mounted profide enough flex for a tight fit without breaking anything. From the inside 3x 4L axle with stop. And with the rim mounted inside out, there is a nice click when you push it on, topped with 6x half bush and a centre axle it sits really really tight. The connections might not all be in system, but this contraption feels really nice and tight and there is absolutely no slack on this hub, using 6 hole rims there's probably a legal way of connecting this, but if three hole rims is all you've got, this is the way to do it. https://bricksafe.com/pages/Permo/slackless-hub

Oh my..., it's going to fly !

Now I wonder how much of that has to do with the tire profile.... If you reverse the tires, will it make it up the ramp head first ? Oh, and inspired by this buggy I am now also building a 4L motor 4WD direct drive buggy, I have finally found a way to use the three hole rims on turntable hubs, I am using the big 60t turntables wich have no slack at all and sit nice and tight.

So far I am still enjoying my 2x V2 receiver with third party LiPo battery, a very fast and powerfull combination. Only downside is the range on the IR remote and outside performance, inside it is very fast and responsive.

I like it !

congratulations !!!

This is looking really slick ! It's not so technic, but I like it a lot, the interior is simply beautifull

It has an illegal battery

the upside down IR receiver (V1) is only to drive the M motor based pump for the pneumatic system (it has pneumatic front wheel brakes) and to switch the front lights on. two V2 IR receivers are on the back of the roof, driving 4 L motors on the rear wheels and a servo for steering. yeah there's illegal bits in there, but hey it's a dragster. I don't have a camera but it's very fast, does burnouts and drifts, very fast and sharp steering.

Yup, it used to crawl.... but now it does burnouts. (changed the white trunk for a black one) but the body is 90% original.

Indeed, mounting the 5.5L axles the other way around does give a perfect fit... Good to know.

I just tried to build that with my dark grey 5.5L axles, and indeed, it does not fit, axles are slightly too wide... Good to know.

That suspension is really liquid !

Cool, I love your 'silent' video's ! Pretty good performance, it rides the staircase really well. Also like the suspension you've got there, nice design !

Ah, now I see it,.... those are the best

Nice ! I love the pneumatic stuff, what's in the top left bag ?

Epic ! absolutely epic Lego engineering ! Beautifull pictures. So what will the next one be ?

Well I tried that, but there is also a thermal protection in the V2 receiver and it kicked in during acceleration from stand still with 4 L motors (1700gr Lego model) So I split the load over two V2 receivers and it runs like a rocket. The IR receiver put out a PWM voltage (squarewave) from an IC (chip) if you couple the outputs it means that one receiver will blast it's output into the other receivers chip, it might blow the PWM chip so my advise would be not to test this. Coupling two batteryboxes into one receiver is no problem.

No do not run 1 motor from two V1 receivers, simply use one receiver per motor. if you want to overcome the thermal protection in the batterybox you can remove (bypass) the fuse or simply use two batteryboxes feeding two IR receivers. I tried all of that and eventually got me a third party LiPo (much cheaper than the Lego options)

It will help a lot yes. From the top of my head V1 allows 800mA and V2 allows 3500 mA. So simply use two set to the same channel. Also the is a thermal fuse in the batterybox itself, which will limmit performance, I run my models from a 11.1V Graupner LiPo which can put out a whopping 140A See it in action here; Video is at the bottom of the page, also found a solution for a drivetrain that can handle the torque, it can be seen in the pics. Cheers ! Happy racing !