I was sailing of to Stellendam and tried out different rpm's with the Volvo Penta D13-900hp engine. She is doing great at 13,7 knots!

As you can see in the other video, at 13,7 knots, did some testing with the rpm's. We do now 17 knots.

Testing an Elling E4 with the gyro seakeeper. Location : Northsea, Stellendam