Select to expand quote
Piros said..Re the board thickness you really notice it on the prone boards , just so much more feel for the foil . That's why we sink the decks . Same goes for the kite foilers they like really thin boards for the same reason. Not such an issue on the wingding boards though , however I can feel a thicker board when I switch with mates. If you want to go ultra short but still want to keep equal body weight or + 10% volume , the rail shape and outline become very important you need to be very smart where you add the extra foam. Big boxy 5"+rails and a chunky square nose just won't cut it.
So to answer your question your board becomes too thick when a shaper can't make the thing work at a set length , so it's better to add a few inches in length then add an extra 1" in thickness for the same volume.

Sorry Piros but I totally disagree with that comment.
My 5ft Prone is 4" thick @ 60 litres, I love it she paddles fast you can duck-dive her & she pumps unreal when I use the 101 AXIS wing
My new 4'10" Prone is 4" thick @ 59 litres
My 6'2'' & 6'0'' & 5'10" SUP foils are like 129 to 130 litres all are 5"inches thick, they all paddle & catch waves very easily & the glide is insane with the 1150 AXIS wing
My weight is 95kg to like 85kg when I'm training
To me volume is my friend
All my high performance surfboards are 2 1/2 inches thick. My 7ft twin-fin is 3" inches thick and goes unreal.

PUMPING BURLEIGH ROCKY Sunday 21st Feb 2021