The TES 28 Magnam (English: Magnum) is a Polish sailboat, that was designed by Tomasz Siwik and was first built in 2010.

[1][2] The boat is built by Stocznia TES - Yacht (English: TES Yacht Shipyard) in Poland and remained in production in 2022.

[1][2][3][4] 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.

The fresh water tank has a capacity of 16 U.S. gallons (61 L; 13 imp gal).