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In Vitez: Bjarne Eikefjord
Motorhome and Caravan magazine, December 6

Innovation from Bosnia: "Space Caravans" has attracted attention

In silence, Denis Kraljevic had developed a completely new caravan concept with a car body cast in fiberglass-reinforced polyester. With a resilient design and a lot of new interiors, the caravan, popularly referred to as "Space Caravan", attracted a huge attention at the Caravan Salon in Düsseldorf earlier this autumn. In retrospect, the phone has hardly stood still, says customer contact Lajla Kraljevic, when BoCM met the couple behind the innovation in Vitez in October.

"It took off completely during and after the Düsseldorf Caravan Salon," say Lejla and Denis. They were filmed, interviewed, questioned, and not least contacted by a number of dealers from countries such as the United Kingdom, Germany, Latvia, the Czech Republic and Austria. There has also been contact from importers from Norway, and Denis says that they plan to participate in next year's caravan fair at Lillestrøm. But, it is one thing to make a prototype, it entails several challenges to put it into series production. BoCM therefore asked some critical questions about the new caravan during the visit to Vitez.

New production method

Casting of fiberglass-reinforced polyester made its entrance into the boatbuilding industry almost 70 years ago, but is a completely new production method for caravans. In large molds, fiberglass mats are laid, which are then saturated with polyester. The thickness can vary from 4-5 mm. to a few cm. After a day, the polyester has hardened, and the whole thing is lifted out of the molds. Again, there is a guaranteed waterproof, self-supporting hull, which does not need braces or uprights. On the inside, the hull is clad with insulation and ordinary upholstery. After which the hull is glued and screwed on a bottom plate, cast in the same way. This gives the hull a rigidity, strength and density that a caravan hull built in a traditional way will never come close to, says Denis Kraljevic to BoCM. And he is probably right, as the experience from 70 years with fiberglass-reinforced boat hulls shows, which has proven to withstand an enormous amount of beating in the face of the forces of nature at sea. Derubis also provides a 10-year guarantee against leaks in the hull.

Type approval

Now it's not just about putting up signs on a newly constructed caravan and then setting off. In order to register a new type-approved vehicle, a declaration of conformity, COC, Ceritificate of Conformity is required. This certificate is issued by the manufacturer and is a confirmation that a vehicle / chassis number is EC type approved. The document contains the EC type-approval number, data for identification of the vehicle and some technical data. The design of and requirements for a certificate of conformity / COC for new EC type-approved vehicles are common within the EU / EEA countries. Denis says that since they already use EU type-approved chassis from AlCo, the way forward is much shorter.

International regulations

Bosnia has acceded to EU regulations on driving licenses, type approval and control regimes. Derubis has therefore sent an application for approval of the caravan to the center for control and weight in Sarajevo. The use of laminated glass instead of plexiglass also requires its own certification, says Denis. Derubis will ensure the necessary homologation, CF marking, and the process of type approval for the EU / EEA has started, he says, and expects to have the documents for registration ready before the turn of the year.

Warm in winter night

The prototype was equipped with electric operation of all systems such as heating, hot water, and the other equipment that is part of a modern caravan. But, would this hold in dark winter evenings when the cold says on? "The question in the future will not be so much how we produce heat, but how we produce electrical energy to operate climate-friendly solutions," says Denis, pointing out that fossil fuels such as gas may disappear in not too many years. "We have set up an electrically based system in our caravan, in the same way as in the boats," says Denis. "Then the energy can come from an electrical contact, from solar cell panels, or from a unit that in the future can be a fuel cell that produces electricity with hydrogen as energy carrier," he states. Before he adds with a smile: "But for those who still want to use gas, we will also make the traditional solution available, possibly with a combi heater that provides both air heat and water heat."

New heating system

"Space Caravan" has much thicker insulation than traditional carriages, will have a completely new and much more efficient heating system, says Denis. Where there is no electrical connection, it should be able to work one night on battery, for underfloor heating, refrigerator and lighting. The editor's skepticism, based on his own experience of waking up to 25 minus outside the car door, did not make much of an impression: "Listen here," said Denis, and drew up a calculation. «From a standard 16A socket, you can take out approx. 3500 watts. Of these, 800w goes to underfloor heating, 800w to your water heater, the refrigerator takes 600w, TV and other equipment travel with another 400mw, and then you have 900w left to heat your caravan with. If you do not add gas heat, which gives around 5 kw », Denis states, before he shows the new underfloor heating strips which with a consumption of 1,1 kw should be able to keep a caravan of 12 square meters of floor space good and warm. "We have now used these for several years in our boats with great success, and, as you know, there is a long way between the sockets at sea," Denis states as he shows off the new heating strips he has developed.

New production hall

Following the attention in connection with the Düsseldorf Caravan Salon, Derubis has received a good number of orders for carriages to several countries in Europe. They are investing in a production of several hundred wagons already in 2022, and a new production hall will be ready by the turn of the year. "Both wagons and boats will be produced there," says Denis as we drive past the new building of around 2000 m2.

Data for current model

  • Shafts: 2
  • Total length: 8.700 cm
  • Inside length: 7.200 cm
  • Total width / inside width: 240/225 cm
  • Total height / internal height: 265/210 cm
  • Mass unladen vehicle, approx: 1.750 kg
  • Mass in travel-ready condition, approx: 1.900 kg
  • Technical maximum permissible load: 2.800
  • Maximum payload, approx: 250 kg
  • Tire size: 185/65 R14 (4 pcs)
  • Bed size, front, in cm (oval shape): 230 x 160 cm
  • Bed size, centrally located (pull-out): 200 x 160 cm
  • Number of beds: 4
  • Number of sockets 230V: 11
  • Number of USB connectors. 7
  • Dometic refrigerator, volume: 153 L
  • Dometic lower bench air conditioning Fresh well: 3000
  • Thetford burns record top black Topline
  • 20Thetford cassette WC C223-CS


Other equipment

  • 13-pole connection system
  • LED recessed spots (power saving, long life)
  • Optimized voltage supply (constant brightness under changing lighting conditions, no flicker)
  • 50-inch flat-panel smart TV
  • USB connection
  • Electric underfloor heating
  • Hot water supply (in kitchen and toilet)
  • Fresh water tank, 100 liters, integrated in multifunction floor
  • Water pipes are routed along the air recirculation hose
  • City water connection

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