GRP Laminate Skin Thickness Calculator - TheNavalArch

We are pleased to launch a new product - GRP Laminate Skin Thickness Calculator

This app helps the user to design the laminate layers of an FRP boat
From the rules/design, you may have achieved the total cured thickness needed for your laminate
Ending up with a thinner laminate means weaker laminate and thicker laminate means excess material is being spent
The user can try out various combinations of CSM and WR reinforcements to achieve the thickness accurately, along with other mechanical properties

The App gives the following

  • The collective thickness (except the gelcoat) for the number of layers of reinforcements used
  • Ultimate tensile strength (N/mm2)
  • Tensile modulus (N/mm2)
  • Ultimate compressive strength (N/mm2)
  • Compressive modulus (N/mm2)
  • Ultimate shear strength (N/mm2)
  • Shear modulus (N/mm2)
  • Ultimate flexural strength (N/mm2)
  • Flexural modulus (N/mm2)


Indian Register of Shipping - Rules and Regulations for the Construction and Classification of High-Speed Crafts and Light Crafts

A video preview of the app is in the link below:

To learn more, please click on the image above or the link below.

does it only work for CSM and Woven?

Apart from CSM and WR, another variety used is veil mat - which does not generally contribute to strength but is used as a first layer before heavier clothes are used.
Ropes are used to fill up nooks and corners.
Basic reinforcements are CSM and WR.

"Basic reinforcements are CSM and WR."
for boats built in the 70’s