Bottom line? ALL surfboards are both planing hulls AND displacement hulls. Guaranteed. All of the marketing gibberish is a matter of degrees.
Want proof?
If you're a hull fan you probably won't be able to handle the proof... I'll just say try standing on your board when it's still in the water. If it ain't planing, it ain't supporting your weight.
Ah… that concept called hydrodynamic lift. Thanks John 
Agreed… John is spot on.
Then again, I s’pose you could just sit on your hull and displace w/o going anywhere.
oh god’’ its a good job roys not here
i think i have argued this out with him before ( and got nowhere)
** cheers huie
**
Hi Huie -
With all due respect to both you and Marc Andreini, I wish Roy were here.
I'm pretty sure he would have something meaningful to add.
Last time around on this topic I believe he stated that all boards are essentially planing devices.
flat bottoms plane on top of the water displacement hulls sit down in the water and displace it. two different things really.BTW a finless hull goes even faster tahn with fins. they'll hold in the wave a lot better than flat bottomed/downrailed type finles boards as well.
[quote="$1"]
but my belief is where a semi displacment hull ends and a planing hull begins in a surfboard
[/quote]
Did you mean to say ''....where a semi displacement hull ends and a planing hull begins is in a surfboard''?
This makes me think of the bottom of Huie’s latest board in the bars of soap thread…hull into concave.
The concept of a bellied fore section and concaved aft section.... nothing new about that really although Huie does a nice version of it. Bob Simmons himself was doing them before many of us were born. It's standard fare now on the Mini-Simmons clones.
The big question.... are they planers or displacers ???