The Aerius Quattro II 520 double (or Commando as it is known in military circles) and the Quattro I 490 SL single model are based on the Aerius Expedition design, but with one exceptional difference : they have 4 integrated air sponsons. This increases load capacity and maximizes buoyancy and safety. With fully inflated air sponsons, the hull shape changes from a V to a U. The latter mode allows for maximum payload and shallow water efficiency. See the difference in hull shapes in the figures below.

Military Application: The Klepper MK13 (equivalent to the civilian expedition model) was the official "stealth" kayak of NATO since 1953 and has been replaced by the four air sponson Commando known in its civilian version as the Quattro II 520 (also available in single, as the Quattro I 490 SL).

The rear loading hatch included on all Aerius Quattro II 520 is sealed with velcro flap and opens with a zipper as shown on this blue boat.

rear loading hatch

The Aerius Quattro II 520 can be sailed with the Freewind Downwind sail and the S2 sail.

Standard Quattro II 520 Features Include:

black Hypalon hull with 4 air sponsons mountain ash and baltic birch natural wood frame two-tone or uni-coloured Egyptian cotton deck deck-circumferencing lifeline for optimal handling numerous tie-down fittings located along its length two length-adjustable seats D-ring for rudder lifting deck pockets for paddles 2 x 2.4' and 1 x 10' keel strips deck bungee rear loading hatch

Convert your Aerius Quattro II 520 into a Aerius Expedition XXL 585 3-4 seater with a kit consisting of a new skin, extension frame parts and extra seat. Two kayaks in one!

• TPU hull
• black wood frame
• Carbon-Kevlar frame
• spraycover
• tarpaulin
• ground-protection mat
• rudder
• height adjustable or comfort seat
• sail

uni-coloured options:
blue
red
burgundy
olive
teal
black

two-tone options:
blue with black stripes
red with black stripes
burgundy with black stripes
olive with black stripes
teal with black stripes
teal with blue stripes