LMTV Mini Truck Trial


As I start this new blog, I thought it may be helpful to post some of my older models to show what I have done, and give a little history to my designs.  In the midst of getting into Trial Trucks, I decided it was time to make a new smaller truck.  I designed a mini truck, to test my abilities with smaller functions based on the Oshkosh LMTV military truck, and to take my mind off the design that was taking most of my time.

I chose the six wheel truck as it would make the suspension of the truck a little more simple than other designs.  The rear axles would be tied together on each side, with a pivot point in between each wheel; one for each side.  A single axle would connect both sides through the dual pivot points, and would be powered by a worm gear directly from the drive motor.  This set-up did not require any additional suspension components, and this would allow the front axle to use an unsuspended pendular set up.  The PF M drive motor was placed above the rear wheels and drove an axle that would go to both the front and rear axles.

Like the rear, the front axle would use a worm gear directly from the motor to drive the wheels.  From the worm gear, a 8z gear was used to drive two 12z double bevel gears for each wheel.  Both 12z gears would drive two more 12z double bevel gears to which allowed for drive through the steering axis.  A simple link connected the two steering wheels, and used a rack and pinion setup to transmit the steering function.  It worked well, and allowed the steering motor to slip at steering lock.  A PF M steering motor was placed above the front axle in the cabin.

I created a small bed, and cabin for the truck and decided to build the truck in blue.  As I was browsing through my Brickshelf folder, I noticed I had too many red vehicles, so something blue would be good.  I placed the 8878 battery box, and PF receiver between the cab and the bed.  This allowed for proper center of mass, and gave me a fully functioning bed.

The model worked well.  For such a small vehicle, it took a lot to stop the truck, in part because of the worm gears.  The steering worked well, but the turning radius was limited, due to the poor steering lock.  I was a fun model, and it is still one of my more popular projects on Flickr.  See the full brickshelf gallery for a more complete view.

T-72


As a child I always wanted a model of the Russian T-72, so I decided to create a version of the tank out of LEGO bricks.  As is often the case, the model started with wheels.  This determined the scale, and from there, I was able to determine the rest of the tank dimensions.  This gave me very little room for all the functions of the tank.

Instructions are available for $5 USD.  Buy Now Button

Model of the popular Russian T-72. View the full gallery here.

The tank includes independent suspension on all 12 of the drive wheels.  6 are suspended with 6.5 length shock absorbers, 4 are suspended with rubber connectors, and the final two are not suspended, but move freely with the track.  The tracks are driven from the rear by two longitudinally mounted PF M motors.   These are connected 1:1, through double bevel gears to the 24z sprockets.  The battery box is place in the front of the tank, with the IR receivers placed over the drive motors.  The final PF M is mounted vertically in the turntable, to rotate the turret.  It could use another reduction, as the rotation is a little quick as you can see below.

I was pleased with the way this model turned out.  While the functions work alright, the aesthetics of the tank represented the original well.

The full gallery may be found here.