hardie said...



Depends on the width of board, sail size, fin size and rider weight. With all non-board variables equal, the width of the hull is probably the most important factor in planing. Wider hulls plane earlier. My 80cm wide slalom board planes in about 10kts, needs to be pumped onto plane, then will stay on plane. My 48cm Missile speed board probably needs an absolute minimum of about 16 to 18kts to get planing. My 60cm wide slalom boards need about 12 to 15 kts to plane.

Hi Nebbian,
So going by that info an iSonic 111 or 122 speeds should be just under 10 knots as it start to plane? So does this mean there is a very close planing window that all boards go through as they start planing of around 10 to 12 knots?
Thanks

Here's a good session to look at, the wind was so marginal that I only got truly planing twice.

You can see that once the board gets 'over the hump' it accelerates well past its planing threshold.

I'd say that the planing threshold on this board (94 litre iSonic) is around 10 knots.



I'd also suggest that a boards ability to plane is affected more by the area of the flat planing surface (so width x length) rather than just width. I think it's a similar effect to 'wing loading' when designing airplanes.

Bilabog said...

I just went and checked my tracks for my I-sonic 122 (75cm wide) with realspeed.
It looks like the board speed is between 9 - 10 knots to plane. It looks like its a very narrow window for all boards to hit the planing threshold.