T_Tank

I wish I had a spare XL motor to test my theory with the differential being connected to the rc motor an XL. I'm thinking that its somehow keeps the RC motors from stalling at low speed an thats where the XL motor kicks in an once the vehicle gets up to speed faster then the xl motor can handle is when the diff starts directing power from the rc motors so it could speed up an since there is a diff between the motors the xl motor won't mechanically slow down the rc motor.

I think because the motors are connected via differential the XL motor runs the grunt of the low speed while the buggy motors take over for the higher speed, Just looking at the design I can understand it similar to a low speed an high speed turbo one is tuned to work better for the lower rpm while the other kicks in more for when your at the max top speed of the slower one....if that makes sence

This is exactly what you speak of what your basically wanting to replicate is the kyosho blizzard braking system cause I remember when I was a kid it not having a dual motor but a single 540 motor to a rear axle/diff that had disk brakes on either side to stop it

THANKS! It goes over most obstacles that are its ground clearance otherwise it gets high centered. I would have embedded them but the photos are 5mega pixel in size rather not kill someone's computer :x Have to deep link the pics as they were uploaded today aswell.

Here is a smallish lego 4x4 pickup that I built an based the suspension off of ZBJ's mini mog Features inclue -M motor drive with RTC -XL motor drive (gearing= 12tDB-20tDB-12tDB-20tDB-12tDB-12tDB-12tB) DB= double bevel B=bevel -Opening Hood with working fake V6 -Opening tailgate an swing out battery holder -Minimog inspired front an rear pendular suspension (front softer then rear on purpose/using cv at the end of the axle to reduce binding if whole axle is moved vertically also purpose made weak point to save gears an ujoints) -Seating for 2 technic minifigures Pics http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142436.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142454.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142505.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142518.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142614.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142715.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142729.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142751.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_142855.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_143018.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_143050.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_143057.jpg http://www.brickshelf.com/gallery/T-Tank/4x4-Pickup-Truck/V2/img_20120208_143109.jpg Video

I know it was talked about a while back in the thread about tire chains being hard to do well THEY ARE but not impossible just a lot of patience takes 10 21 link chains to do this with the stock unimog tires. No clue how well they work cause where I live there isn't snow :C Assembly goes as fallowed 1 chain for going across the tread an 2 on the face of the tire if that makes sense I hope. Sorry for the pic size :x

Do you still have full steering lock on it or is it reduced?

I don't think anyone has figured out how to make the return to center mechanism for the crawler yet have a hard time imagining how to make one with current parts we have couldn't use a hockey spring cause the gearing I beleave makes a full revolution before steering lock

I wonder how long it will be after the crawler is released we seeing one being used in a truck trial with the diffs removed an a 8t/20t at the portal axles. I can see this thing having some INSANE gearing modifications so ya its ultra slow but will go over almost anything.

that looks.... AMAZING!

I know that trying to put the power puller wheels on the other way around from the diagram they won't fit but if you have the deep side outward they do fit.

Looking at how the drive train is put together I would be surprised if lego put a fake motor in there though I'm sure someone will mod the crawler to have a fake motor an powerpuller tires very quicky.

looking amazing man! the truck actually looks good in red an black to :D

If the main drive motor rides on the front axle would that mean they actually thought about weight balance when designing this???

seeing the white panels in the back makes me wish lego had more of the other panels in white :c there is definitely torque in this model for once lego has made a rc that can actualy go up a slopes an inclines those axles are really large. One thing i'm really curious about is how the steering motors work cause when i tried giving one of my models 4w steer it crab walked when steering.

Do want crawler an give it a better looking color scheme >.>

I'm gonna need some bigger tires o.o

using the train motor gave me a idea to how you could make a steerable tracked vehicle though it require 2 of them an some sort of center link so it be kinda like mahjqa's lil track vehicles though need a 9V battery box an possibly a micro motor an a mini LA to steer it in the center an working with studded construction to make the body go around the receiver an wiring an such. Just a crazy idea >.>

Seams like you may be fallowing in the footsteps of other large truck designers if you go with adjustable air suspension with load sensing valves very cool :D

Exactly! So Effe is this gonna be a cab over styled truck like a scania or more along the lines of a American conventional? I think a international lone star would look rather awsome in technic http://image.trucktrend.com/f/videos/video-find-the-ins-and-outs-of-the-international-lonestar/17874426/international-lonestar-class-8-tractor-front-view.jpg

Sorry for the possible confusion effe but the inter axle differential aka I.A.D. is a differential that allows the rear axles to spin at different rates its a feature on most modern american big rigs it allows the front back an back back axle to spin at different speeds (kinda like a central differential on a AWD) Might be overkill for a lego model but thought it be something interesting to see. Another question seeing how massive the axles are I wonder if your gonna make a huge box trailer for that beast to tow about. Oh an possibly for the front axle you could use the unimog portal hub assembly's with 3 long beams an a few 2x4stud lift arms against the beams to help with rigidity. Not the best images i could find but here ya go http://meritor.com/_layouts/images/arvinmeritor/header_customer_na14x_tall.jpg My link

I have to ask out of curiousity but are you gonna add a inter axle differential for the rear drive axles? your scale would be big enough I would think making it lockable though would be another story.

I've seen these before but it would appear the ones sold there are to large to fit inside the lego "torque tubes"

After warping snapping an shearing u-joints in my unimog an my reworked Big Earl monster truck I'm wishing lego or somebody would make a cv joint that would be the same dimensions of the 3L u-joint that would be a lot stronger even been tempted to find a machine shop an see what it cost to have some machined from alum or even steel since its really the biggest issue i have with making a strong pendular suspension system. Big earl's issue is there isn't room for a reduction at the hubs due to the steering parts i've used to reduce the offset from center while using power puller wheels an the unimog I need something more then 8t to 24t in the portals (my mog an crawl agressively over 5" ledges but ends up blasting a u-joint quickly. Anyways Ideas comments concerns opinions?

I can think of a way to avoid burning up a pf reciever while using multiple rc buggy motors but the question is how much current can a pf switch handle? >.> Solenoid method anyone control BIG current with little current. Thought about trying this with 2 battery packs in series (if possible) an running them to a switch thats connected to the motor an then control the switch with another motor though probably way over complicated for legos.