Good to see somebody’s thinking in terms of getting some hard numbers. The trick would be in getting 'em and recording 'em, then in turn doing something with it -
How I would play with it might be in several stages:
First, instrumentation- using the flex sensors pinhead has mentioned, perhaps adding pressure sensors like http://www.imagesco.com/catalog/sensors/pressure-info.html , set up the fin(s) or other surfaces. Note that this need not be limited to fins. Measuring pressures and flex over the whole of a board would, I think, tell us quite a lot which we only think we know something about now.
Wiring for the sensors could be stitched into the glass - it’s real light-gauge wire that wouldn’t require a channel in the foam or anything of the sort.
Now, once you have the sensors installed, you can collect data. But how to store it, along with a timer so that you have a series of measurements?
Something like one of these: http://www.parallax.com/html_pages/products/basicstamps/basic_stamps.asp - the Basic Stamp series are microcomputers/microcontrollers which can be used for logging data ( as, for instance, resistance changes) - the http://www.parallax.com/detail.asp?product_id=BS2PE model is optomised for just that.
Sensors, power source and all can be done up in a small package, something considerably smaller than a bar of wax. And they are capable of taking data from several sources simultaneously ( 16 I/O pins on these little beasties) , storing it as a time-series of measurements and outputting it ( via a serial connection) to a laptop computer. It shouldn’t be especially difficult to make a little ‘black box’ that’d be waterproof and set into a small recess in the deck of a board.
As an aside, I had a gig developing a Basic Stamp based counter and controller setup for the aquaculture industry, to size, count and package shellfish on-site in a very wet environment. When I found that it would be a whole lot easier to implement using an obsolescent ( and cheap) laptop computer I bagged the project, but size and weight of the package were not constraints as they are here. A small instrumentation package that’d easily fit on ( or in) a board could be done up cheaply and well.
Then, test and calibrate the stuff so the readings you get in actual use mean something rather than just raw numbers. Lots of ways to do that.
As there are lots of folks here who are a whole lot better at electronics than I am, I’ll leave it at that for somebody else to take further. If someone is in a marine engineering program now, this would make a very nice thesis project.
hope that’s of use
doc…