Modern composite construction fifth wheeler


Modern composite construction fifth wheeler

Why can the 27FLB lift itself off the ground?

Modern composite construction fifth wheelerThere is a good reason why most caravans and fifth wheelers do not have strong jacks under the rear of the chassis. It’s because the chassis was not designed to carry the load of the trailer if jacked up from each corner.

The Adventura 27FLB, built by Pacific RV Australia, was designed from the jacks to the roof to be strong enough to pick itself up off the ground, wheels and all.

The question that I hear often is “how do you make the Adventura 27FLB so strong, but at the same time keep the weight so low?”.

It mainly comes down to two things; smart design and a modern composite construction fifth wheeler.

Smart design

The design is similar to Monocoque construction.

In simple terms, all the strength of the outer panels and inner walls are combined with the 400mm chassis in a way that combines all the component strengths together.

The floor is a one piece composite sheet with no joins. The massive bracing strength of the floor is then added to the horizontal strength of the chassis. The strength of the one piece wall panels is then added to the chassis vertical strength, then the one piece composite curved roof is added to the wall strength.  The front, middle and rear walls again help combine the strengths of the panels and chassis. The trick to joining all the panels and chassis together in a very strong way, is specially designed aluminum extrusion joiners.

Composite materials

The Adventura 27FLB Fifth Wheeler has composite panels throughout the trailer. Composite panels are used because they are externally strong, very light and they will not rot or hold moisture.

In fact, no timber is used in the main construction of the Adventura 27FLB.

Floor construction

Modern composite construction fifth wheelerThe main floor is made from polyurethane honeycomb core with fiberglass reinforced plastic bonded on both sides. Polyurethane honeycomb core is used on the floor due to it’s strength and high ability to handle compaction. The lower storage floor is also made in the same way.

Wall construction

The wall panels are polystyrene with fiberglass reinforced plastic bonded on both sides.

Polystyrene is used in the walls and roof due to the fantastic insulation properties. If 2mm of polystyrene in a coffee cup can stop boiling water burning your fingers, imagine what 35mm can do to keep out the elements!

The wall panels contain an aluminum frame, allowing the panels to be joined strongly together, and the internal components to be securely attached to the walls. To my knowledge, Pacific RV Australia is the first to insulate the aluminum wall frame to stop heat transfer through the walls.

Roof construction

The roof panels are the same construction as the wall panels, aluminum frame and polystyrene core with fiberglass reinforced plastic bonded on both sides.  The 27FLB has a one piece curved roof.  A roof which is not only very strong, but strong enough to walk on, and allows rain water to run off into the Adventura’s built in gutters. The chance of roof leak is highly unlikely in a one piece roof.Modern composite construction fifth wheeler

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