# Boards for eFoil

**URL:** https://foil.zone/t/boards-for-efoil/658
**Category:** Foils & Boards
**Created:** [November 17, 2017, 7:50pm UTC](https://foil.zone/t/boards-for-efoil/658 "2017-11-17T19:50:27Z")
**Posts on this page:** 1
**Showing post:** 63

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### Author: ![SoEFoil](https://foil.zone/user_avatar/foil.zone/soefoil/32/55_2.png) [@SoEFoil](https://foil.zone/u/SoEFoil)
#### Post date: [June 17, 2018, 11:56pm UTC](https://foil.zone/t/boards-for-efoil/658/63 "2018-06-17T23:56:21Z")

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Illustration:

 ![eFoil%20board%20descr](https://efoil.builders/uploads/default/original/2X/f/f6a566d7ef0140dd54da144158a65a0b9ff4f6e0.png)

Example for a comfortable ride with waterproof box on top of board.  
John 75kg, 1.80 m, shoulders’ width 60cm (0.6m)  
V = (75 + 30) x 1.1 = 116 L= 0.116m3  
W = 70 cm = 0.7m  
T = 0.116 / (1.8 x 0.70) = 0.092 = 9.2 cm  
Nose bevel: board top length = John’s height = 1.8 m  
Board bottom length = 1.8 x 0.8 = 1.44m

For a comfortable ride with waterproof box inside the board (box dim = 30 x 20 x 10cm = 6 L)  
To preserve board structural strength, you have to add a minimum of 2.5 (1") cm of EPS foam under the box.  
So new board thickness = Box thickness + 2.5cm. (1")  
In the above example, new T = 10 + 2.5 = 12.5 cm  
New board volume = (1.8 x .7 x 0.125) / 1.1 = 143 L - 6 L (box volume) = 137 L with nose bevel (hence /1.1)  
So adding a 6L waterproof box adds 21L to original board configuration with box on top.

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