The multiple-time national champion says the WGPSSRC, the governing body for GPS speed sailing records, is currently analysing the files from his two GPS units before ratifying the new record, which he set on the man-made lake in the Wirral in winds of up to 45 knots and amid "huge squalls in hail showers".
He explained of his chosen location: "When wind direction is correct (120-135 degrees off wind) we can sail extremely close to the wall of the lake to get flattest water, uninterrupted by the strength of the wind.
"Yesterday was one of those days, though the wind turned out a little too broad, making the water too choppy and ultimately slowing us down as there was not enough space to do longer runs, meaning crashing was a huge possibility."
Van Gelderen says one fellow speedster was hospitalised with suspected concussion and whiplash from crashing "into the water - not the wall".
The potential new record, representing van Gelderen's average speed over 10 seconds, beats his previous record of 45.02. He also says he upped his average of five fastest 10-second runs to 44.97 knots, and peaked at 47.3 knots. Details of his session are available HERE.
At time of writing, the record would put him fourth in the world for GPS speed sessions in 2015 - though the table is subject to change at any time as windsurfers from around the world contribute their data.
Van Gelderen also points out that the Irish record set by his late friend John Kenny and sanctioned by the WSSRC still stands.
"It has huge potential [for me] to go much faster," he says. "Fifty knots is in my sights."