Ariel is swinging a 22 x 20 prop, recently repitched from 22 x 18 last October whilst the shaft was replaced from mild steel to stainless duplex.
Ariel has a HA2 coupled to a 3:1 blackstone box.
Tickover speed has increased noticably more than general cruising speed which is also noticeable. There has been no difference in reverse. Ariel has always behaved impeccably going backwards, being steerable for a mile in the past.
Whilst discussing prop size it was mentioned that Ariel's current setup could accommodate a bigger prop, unfortunately the boat can't due to the shaft coming out off centre. There's a massive amount of room above the prop to the counter, but only 2 inches between the skeg and the bottom of the blade.
Getting back on topic, because of this the mention of going over square was mentioned to crowthers was mentioned, with negative comments received back.
One day I'll have my 2:1 box and be able to increase speed over water with slightly less revs.