Rocker and Rise - 3D modelling

The plot below shows a side-on view of the longboard design and is based on the rocker and rise as  discussed in previous posts. Recall that this represents the total thickness and does not currently include any rounding and/or contouring of the top of the board.

As shown the design is not quite right with a small reduction in the thickness of the board apparent at about three quarters along from the stern. In this regard, what I have realised is that the top of the board should be flat along the centreline for a distance which covers the length of the mast track and the front of the centreboard (duh!). I'll build this into the design and will have another go at building up a 3-D model of the design over the next few days.

On another topic, the garage clearing has gone well and I'll shortly begin building the board construction table. I also have some news regarding a rig for the board and will likely discuss this in the next post.
Bye for now.

Rocker and Rise

Just a short post to log the progress made over the last few days. As discussed in a previous post, the intent is to marry a plan shape and rocker based on the Pan Am with a rise and rail system based on a Phantom 380. So a chunkier looking Pan Am shape. I think this will suit my lighter weight and will also have the aesthetics and high wind performance of a slightly narrower board.

I've been scaling the Phantom 380 rise (rail heights) from one of the images shown in an earlier post and have plotted it here added on to the model of the Phantom 380 rocker, also shown in an earlier post. Because I've scaled the rise by hand from an image, my estimates are a little noisy and so I've done a least squares fit of the data using a 4th order polynomial to provide a smoother representation. Just need to go and check some of the numbers now against a real board to ensure that they look reasonable.

The rise shown here should be the total thickness of the board prior to any rounding at the top of the rails. As such, the functions used to generate this image would then be used to construct a couple of templates which would be pegged to the side of an uncut polystyrene block (see image on the right from Emsworth Custom Boards) which would in turn be hot-wire cut to the template. Of course the functions describing the rise would also have to first be adjusted to account for the thickness of the high density foam outer layer.

Cheers

Look Ma, Multi-tasking!

It can be seen from the posts below that the board design is progressing reasonably well. Given this, a secondary task is now to set up a board construction area. Our house garage has been allocated as this site, however, given that it is currently crammed from floor to ceiling with junk, the site preparation is a bit of a challenge.
 

Once the garage has been re-arranged (to make a space roughly 4 m x 2 m for board construction), it will be time to put together a work bench.

Bye for now.

Schematic of Board Shape

Next step is to build in the rise. As noted in the previous post, the intent is to add in some nice chunky rails.