There's no single right answer that will cover any 20' sloop, the size and shape of the keel the form of the hull and how the sails are ballanced will all affect what size rudder is needed, as well as the shape of it. Also the answer will depend on what handling characteristics are desired.
As for just the depth of the rudder, usually it will go to slightly less depth than the keel when the keel is at it's deepest. Some lifting keel yachts, especially smaller ones, also have a lifting rudder.
It is a "sloop", said to be "sloop-rigged".
The Sloop Inn was created in 1312.
Dorothy Sloop died in 1998.
Dorothy Sloop was born in 1913.
Kingfisher - sloop - happened in 1864.
Greek sloop Karteria was created in 1826.
A Sloop has only one mast a schooner has two.
It's from the Dutch word: sloep. (Which, as far as I can tell, means "sloop.")
Sloop John B was created on 1966-03-21.
Texan sloop-of-war Austin was created on 1840-01-05.
Texan sloop-of-war Austin ended on 1846-05-11.
Sloop rhymes with moop, loop, scoop, rupe, lupe, and whoop soup puke duke luke
the word sloop originally comes from the dutch word "sloep" so therefore the word is dutch
The cast of Hoop of Sloop - 2012 includes: Michelle de Bruijn as Herself - Host
The address of the Hudson River Sloop Clearwater is: 724 Wolcott Ave, Beacon, NY 12508
That was The Beach Boys.
first female christening