We have the HC44PH and she is a ketch rigged cutter.
We did a sail trial back and forth in the river to average out the tide and got 8.25kts average in around 20-25kts of wind. This was with all sails and unreefed.
On most trips we motorsail as you can guarantee the wind is never in the perfect direction for a holiday trip. Usually get an average 7-7.5kts.
We re-rigged ours to the original rig plan. The main mast on the ketch is pretty high - around 55ft - and certainly taller than the Beneteau 42 sloop that moors next to us - much to the owners dismay.