KD 650 Plans
The KD 650 is an other approach for an affordable trailer catamaran for amateur construction. The boat is designed for coastal sailing and will have a good turn of speed with its efficient Gunter rig.
The boat is easy to build with plywood/glass/Epoxy construction. The first time DIY boat builder will have no problem building the boat. With the asymmetrical hulls, no dagger boards are necessary to go as well to windward as any very good mono hull.
To avoid the high costs for the rig, i.e. mast and rigging, the boat sports a modified Gunter rig. I "modernized" the rig so that only one halyard is necessary. The yard is fixed to the mast. The mast is free rotating. The result a semi wing sail. The plan shows how to build the mast from an Aluminum tube and some hardware. The gaff is made from clear fir, UD- carbon and glass cloth.
The beams are made from readily available Aluminum tubes. Besides cutting them to length, there is nothing to do. This will shorten the construction time by about 40% compared to boats where wooden beams have to be built.
The set up time, once at your favored sailing ground, is short. To make sure of this, I designed a quick beam fastening system. Only four nuts have to be fastened to fix the beams. The mast is only 4.3 m long and weights a mere 9 kg. Setting up the boat will take 2 people no more than an hour. This will be no different on a beach or in a port.
The rig is a modernized one halyard Gunter rig.
|LOA hulls||-||6.50 m without rudders|
|Beam c/c||-||3.00 m|
|Beam Catamaran||-||3.50 m|
|Beam on Trailer||-||2.00 m|
|Draft hull/rudders||-||0.33/0.54 m|
|Weight empty||-||340 kg|
|Weight CWL||-||760 kg|
|Sail area||-||18.6 mÂ²|
|L/B hulls||-||1 : 16.6|
|L/B ratio center line||-||50 %|
|Construction time||-||about 500 hours|