Klepper Aerius I with Balogh Sail Rig

Condition: Used

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Klepper Aerius with Balogh Sail Rig

One of a kind Klepper Aerius I, 1998 model year, used by Jonathan Waterman on an arctic expedition. See his book and video ARCTIC CROSSING.

I bought the boat from Jonathan several years ago. I have paddled/sailed it several times. While a bit rough in places the boat remains seaworthy. With it come a number of accessories and parts.


The Skin: THE DECK

The Good: Though faded the deck is generally in pretty good shape. Prior to the expedition, Longhaul Folding Kayaks of Colorado installed two zippers fore and two aft to create V-shaped access points to the areas beneath the deck. Most handy. The heavy-duty zippers are in good shape but the welting over the zippers could use work. Two flaps of deck fabric, one from port side and one from starboard, overlap each other and the fore zippers. Same for the aft zippers. Nylon straps and buckles secure the flaps. The port side of the deck, at the hull interface, has been professionally patched with about three inches of deck fabric.

The Bad: The deck has a frayed spot on the port side where it has contacted the rib clamp. [Deck fabric is included among repair items.] Also a small rough spot amidships starboard. And a rough spot beneath the cockpit nose piece.

The Skin: THE HULL

The Good: Prior to the expedition Longhaul Kayaks added robust rub strips to the hull. The sponsons hold air.

The Bad: The rub strips add significant weight and volume. The hull has some abrasions but none that affect seaworthiness.


The Good: The frame pieces are in good shape, including the varnish.


The Good: Mechanically the rudder is fine.

The Bad: The rubber heel pad of the pedal assembly shows wear. The rudder blade shows wear on the bottom edge. Neither of these affects the usability of the rudder.


The Good: The seat is a Longhaul Comfort Seat, a $175 dollar item

The Bad: The seat was never installed onto the bottom frame. It just sits on the bottom frame. I used it that way. Longhaul’s website has installation instructions as a pdf file. Installation entails drilling four holes in the bottom frame piece and threading nylon straps.


The two storage bags are heavy duty made by Longhaul Kayaks. One is like a very large suitcase. The other is like a large golf bag. Both are in excellent condition and come equipped with handles as well as backpack straps.

Jonathan included all of his accessories, spare parts, and repair parts when he sold the boat to me.


Spray Decks and Skirts: Decks are separate from the skirts. The skirts have a heavy oval of shock cord sewn into the bottom. That shock cord stretches over an oval plastic tube sewn into the deck. This is a safety design so that the paddler can easily exit the boat in the event of a capsize. Included are two decks, one slightly modified to accommodate a Balogh sail rig. Also included are three skirts, one heavy weight, one medium, and one light weight. All three skirts have suspenders.

Tiller: A tiller assembly that appears to attach to the boomerang [aft coaming piece] but I was never able to figure it out completely since its rudder cables seem too short.

Cross-coaming seat: Jonathan, who had a Balogh sail rig on his expedition, liked to sit atop the coaming on a home-made plywood seat and steer with the tiller. The seat does not attach but has a section that wraps around the boomerang so the seat does not slide left and right.


Spare Parts: Rudder yoke x3, rudder pin x2, rudder chain, sponson plug, longeron sleeve, various frame clips, moon clamp.


Tubing splints, frame splints, assorted rivets and screws, deck fabric, hull material.


The boat is equipped with a Balogh Sail Designs upwind sail rig. The sail rig consists of two assemblies: 1) The mast and sail. 2) The crosstube, leeboard, akas, and amas. The lowest mast section fits through the hole in the Klepper cockpit nose piece and steps into the square hole in the bottom of the Klepper frame. Two additional mast sections allow hoisting the included 24 ft2 reefable sail. A crosstube clamps to the Klepper coaming. Akas, which are the support for the amas [pontoons], fit into the ends of the crosstube. The inflatable amas are suspended from the akas. A leeboard helps with side slip while under weigh.

The Good: The amas are nearly new. The sail fabric is in very good condition [still feels stiff, not slick and floppy]. One of the spray decks has holes that accommodate the crosstube clamps.

The Bad: The sail had a ½” tear that has been patched. The plastic leeboard is cracked along its seam to the point of being unusable without repair. A new leeboard could be fashioned from marine plywood or a hardwood plank or planks, then used with the existing leeboard clutch. The adjustable clutch allows the leeboard to rotate around the crosstube but stay up when it is pulled from the water as you prepare to land. Also, Balogh may be able to supply a new leeboard. Last I looked about $400. The mast is tall enough for the included 24ft2 sail. If a larger sail is acquired another mast section would be necessary. Contact Balogh sail designs.

Approximate Location

Location is approximate