The ETAP 21i is a Belgian trailerable sailboat that was designed by Mortain & Mavrikios as a cruiser and first built in 1997.
It has a fractional sloop rig; a plumb stem; a vertical transom; twin transom-hung rudders controlled by a tiller and two fixed, shallow draft, tandem keels.
[5] In a 2003 review in Yacht and Boat magazine, Barry Tranter wrote, "as the wind builds she heels initially, then the cast-iron bulb keel stiffens her up.
And just when you think you may need to reach for the traveller to ease a bit of pressure you realise that the leeward rudder is biting deep into the water and keeps the boat tracking straight.
As a result directional stability is exceptional, vital on short, light hulls, which can get out of sorts when tiller, mainsheet and the skipper's brain get out of phase with sharp gusts and lulls.