Engesa Boomerang walking beam suspension - video

[Altair]

The Brazilian-made Engesa EE-25 utility cargo truck featuring its "Boomerang" rear axle with walking beam suspension.

Previously:

Tracked pickup truck - photo
Hydraulic leg truck turning assist - video
Fence washing truck attachment - GIF

[Toolmaker51]

Torque +Traction +Ground Clearance =Git 'er done.

[Steved53]

I think Scammell used a walking beam on their Pioneer trucks back in the 1930s..... With full 6 wheel drive they went nearly anywhere.

[Radioman]

Mack has been using walking beams for a century!
From the video I can’t see exactly how the power is transmitted to each one of the rear wheels. If I had to guess I would say there’s a chain inside the walking beam transmitting power to each of the rear wheels and the chain is being powered from the center pivot point. Of course this is just MHO?
I think the driver has to re-read the book and understand what constitutes a running start.

[KustomsbyKent]

That is one hell of a bad @ss truck! I want one!

I bet a bit more weight on the rear end would actually help it get more traction for climbing. The articulation is fascinating to watch over the rough stuff.
Thanks for sharing.

[Loose Ctrl]

Mack has been using walking beams for a century!
From the video I can’t see exactly how the power is transmitted to each one of the rear wheels. If I had to guess I would say there’s a chain inside the walking beam transmitting power to each of the rear wheels and the chain is being powered from the center pivot point. Of course this is just MHO?
I think the driver has to re-read the book and understand what constitutes a running start.

Gear reduction boxes are mounted on the rear axle. The wheels are then mounted to the reduction box hubs. No chains were harmed. I believe Portal made those.

[sossol]

That engine was making some beautiful noise. Sounded like a 2-stroke Diesel.

[Frank S]

One huge advantage that truck has is the single rear differential powering a motor-grader type enclosed chain drive to stubbed independent axles allowing for extreme vertical movement Another advantage over a 6 wheel drive truck with 2 rear ends is at all times both tires on either side have weight distributed to them evenly due to the power coming from the center of the walking beam this also lends for a much wider range of from front left to right rear and vice versa.
I have little doubt that if the truck had a cargo bed with some weight in it the truck could have traversed the hill each time on the first attempt.
Yes the engine does have a sound like that of a 2 stroke engine possibly a 6 71 Detroit . The transmission sounds like it may also have several gears with a close ratio pattern but there were times when the driver was not utilizing the sweet spot of the torque range to its full effect possibly due to not up-shifting and down shifting at the optimum times

In my opinion the truck is a winner winner chicken dinner for a rough service off road lower speed transport vehicle. Equally as effective as a 10 times more complex modern vehicle used by the US Military 1000's fewer parts. but over all lacking in the protections and comforts the US military has become so spoiled to.

[ranald]

I was expecting ,with all that fun, the driver would do 6 wheeled donuts.

Thanks for posting.

[Isambard]

Their 6 x 6s were still being built with it in the 60s...There is one locally.