This was tweeted by Carberry Sailing who operate a Hallberg Rassy 46 that had been suffering from disappointing motoring into heavy weather with their previous propeller:

"New propeller fitted on Merlin Five blade Max-Prop has certainly made a difference going ahead into a 3m swell and head wind. 8kts no problem @2200rpm.”

 Carberry Sailing Hallberg Rassy 46 – 5B Max-Prop Whisper