PPS - The only way I know how (just the way I have tried before and it worked a little, but I sure found it hard) is to take more off the chest/deck area and then use a round sanding tool (40-60 grit on broom handle or similar) and spend a LOOOONG time running it from the middle up to the nose with varying pressures by hand). That's my 'way', if it can be called a 'way'!!
Thanks guys, this did help, will watch some more videos and read more threads
https://invidio.us/watch?v=EBW49mjSXLk - Piece of cake!! Just drop it. ahahhaa
I think this video helps to explain my question way better than I did with my original post!
At exactly 1 Min 22 seconds in - THAT is where I get hesitant and lack confidence. When planing the deck side, if you go end to end, you keep the profile of the blank, and i want to increase the rocker. I think what I did last time was lighten up the plane towards the nose or not use it there at all (it lifts off itself). I have got no skill with my cheap ass planer to twist the screw (adjust depth of cut) as I move. I can do it a bit on the bottom where it's obviously way easier, but on the deck I think i will just leave the front quarter alone (with plane) and use hand tools only round there, hopefully leaving more foam to allow for some increased rocker.
Another thing I have just realised I should have mentioned...... I am fine with getting rocker on the bottom side. (That's easy of course!). Its the top side, where the planer and any square object won't 'fit' due to the upwards curvature!
https://invidio.us/watch?v=2KEuu57NiPY - This is pretty much exactly what I do. It looks a bit "beginnery" to me (no offence to the guy on video), as it gets bottom nicely but also flattens the deck and my son wants to SEE the rocker in the nose from top side, as opposed to just 'having' it (which is of course the most important thing) on the water facing side!
I never build a foam board, so this advice may be totally bullshit but:
if you cannot get the rocker out of blank, why not try getting it into it!
Sounds weird, but take a rocker profile, cut it into 6 or 8mm plywood creating a new stringer, then rip the original stringer out to the foam blank and glue the foam halves to the new stringer, voila no wood planing anymore, just pair and match the foam to the stringer and you receive the rocker you wanted.
hahaha. I wont be doing it but that idea is SO frikkin brilliant!! One day I am gonna try that, love the logic!
Some simple logic:
Bottom rocker curve would have greatest effects on wave catching/riding performance.
Deck rocker curve would have greatest effects on foil shape/flex and volume.
Just my $0.02.
Swaylocks Surfboard Design Forum: thoughts & theories ... practical & theoretical
RAIL PROFILE http://bgboard.blogspot.com/2014/03/march-82014-afterr-seeing-recent.html