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Step 2Design the shape
You can draw it by hand, you can use CAD, there are no rules. There is a great idea in the instructable for the plywood kiteboard involving CAD and a large printer.
The approach I took involved creating an elipse in Maplesoft 11, then transferring the equation to excel and solving for points every 5cm. I plotted these on the foam myself and connected the dots with a pencil then a knife.
You will see that the board in this project has two layers of foam epoxied together. This was done to save on the cost of the thicker core cell foam. Foam was cut out of the upper layer near the tips to provide more flex.
The equations for the lower and upper ellipses used here are:
y1=0.108e-4*sqrt(-4.62962963*108*x2+4.398148148*1012)
y2=0.450e-5*sqrt(-2.22222222*109*x2+1.922222222*1013)
Put these into excel with 'x' as points every 5cm from the origin and voila. The board here is 136cm long and 44cm wide.
The approach I took involved creating an elipse in Maplesoft 11, then transferring the equation to excel and solving for points every 5cm. I plotted these on the foam myself and connected the dots with a pencil then a knife.
You will see that the board in this project has two layers of foam epoxied together. This was done to save on the cost of the thicker core cell foam. Foam was cut out of the upper layer near the tips to provide more flex.
The equations for the lower and upper ellipses used here are:
y1=0.108e-4*sqrt(-4.62962963*108*x2+4.398148148*1012)
y2=0.450e-5*sqrt(-2.22222222*109*x2+1.922222222*1013)
Put these into excel with 'x' as points every 5cm from the origin and voila. The board here is 136cm long and 44cm wide.
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