The TES 28 Magnam (English: Magnum) is a Polish sailboat, that was designed by Tomasz Siwik and was first built in 2010.
The boat is built by Stocznia TES - Yacht (English: TES Yacht Shipyard) in Poland and remained in production in 2022.
The TES 28 Magnam is a small recreational keelboat, built predominantly of fiberglass. It has a fractional sloop rig, an internally-mounted spade-type rudder controlled by a tiller or optionally a wheel and a retractable centreboard or optional fixed keel. It displaces and carries of ballast.
The centreboard version can be transported by trailer.
The boat has a draft of with the centerboard down and with the centerboard up.
The boat can be fitted with either and inboard or outboard motor. The fresh water tank has a capacity of .
The design has a hull speed of .