Facts about aluminum boats

Aluminum material

We use ALMG3 (5754) aluminum alloy. Hull 3mm, sides 2mm for the optimal strength and weight ratio. The material shows high mechanical properties among the non-heat treatable aluminium alloys and shows a very good atmospheric and seawater corrosion resistance. It has a good weldability and is used for example in marine and offshore applications. For boat building is very important to choose the right alloy. If you use softer alloys, you need thicker material to reach the same strength, doing so, the weight of the boat increases which results in decreasing speed. If you use harder alloys the boat will be too rigid and can crack. The picture below shows the hydrofoil boat famous for carrying Freddie Mercury on the Danube. This boats hydrofoil wings are also made of the aluminum we use.

More specification about the alloy

https://www.smithmetal.com/5754.htm#:~:text=5754%20aluminium%20alloy%20offers%20extremely,%26%20gas%2C%20chemical%20and%20nuclear.

Decent welding quality

AWI technology enables the optimal fuse of the plates. Our highly certified experienced welders are doing a great job. Check theese pictures

Very stabile

Important to note, that the shipbuilders must comply with the following statements. (with a small 10-20hp outboard)

  • If it's fast -> cannot be wide stabile and comfortable
  • With flat hull -> noisy, bad maneuver control
  • With V-hull -> slow and unstable
  • Short boat body -> bad gliding properties
  • Big sideplates -> uncomfortable to fish -> small sideplates -> water slaps in
  • If boat weighs much -> uneasy logistics -> if it's too lightweight -> fragile
  • Narrow body ->unstable statically and dynamically also

Our tests prove, that with this comfortable wide and stable dimensions we are the fastest, perfect gliding (low generated waves) acceptable weight (150-200kg). We think that we've found the best dimensions for a boat.

Strong body

Check these pictures. The trailer got hit by a car from behind. Engine broken away, the transom remained intact.

Spacy

Pictures show a Classic and a Fishing model. Guys are around 185cm.

Fast, perfect gliding

We've used the modV bass boat hull design. That means the boat glides only on a small area of the hull, it does not have that water-friction like any other hull types have. This is why when you watch from a distance a Rumann boat, you have the sense that is not touching water. HIBRID azaz ötvözi a V és a lapos aljakat (modV). Sikláskor kiül a siklófelületre ezért kisebb felületen találkozik vízzel így kisebb surlódási erők hatnak rá. Ezért van az, hogy a kinyúlt, siklásban levő vízszintes testünk a partról nézve “nem éri a vizet”. Sok Rumann másolat készül, de a fenék kialakításához számítógép vezérelt préselés szükséges. Ezért a fenéklemezt nem képesek utánozni! Nem a másolás a baj, hanem, hogy rosszul csinálják 🙂 …ne vegyél sok pénzért butább, rosszabbul sikló csónakot!

Hull types explained

Flat hullV-hullCatamaran-type hullsModV hull (Rumann)
Pro'sFastest hull type. Cheap to produce, Stabile if wide, small draught.Good in waves, good maneuver, Cheap production.Stabile, if gliding low friction with water, so it's fast.Stabile, easy glider, fast because only the small gliding surface is touching water. Low noise, because V in front. Comfortable with high speed.
Con'sVery noisy on high speed. Dangerous to maneuvre on higher speed.Slow hull type because the big surface for water friction. Unstable if lightweight- but if heavy -> even slower.Cavitation danger, mainly in curves. Needs bigger engine to glide. Noisy because of flat parts.Drifting capability, but owners rather like it then criticizing it. Costly to build such hulls, because of the needed machinery.
Recommended usage areaCalm inner waters, smaller lakes.Bigger lakes, rivers, even coastal waters (if deep V)Bigger lakes, rivers.Bigger lakes, rivers.
Rumann barci aluminiu
Rumann aluminum boat slightly touching water when gliding.