Robby
When I had a 22 the previous owner had added plywood to each side of the blade, giving an aerofoil shape, which not only worked better but made the blade float and easier to lift.
I fitted a tiller cam cleat that trips, if you hit the rudder on the bottom, it rises to horizontal, not staying on the bottom.
When the blade cracked I replaced it with a stainless steel, shorter blade made full length with ply and again shaped and cased in fibreglass.
Philip
ex Tulena 22, now rascal 26