For in-situ degradation testing of fabric wing surfaces, parachutes and balloon fabric as well as stitching. Now with stitch puller. Consult your aircraft manufacturer for fabric load limits.
The Bettsometer is a tear resistance tester designed for use on fabrics such as aircraft ‘skins’, sails, parachutes etc which cannot easily be removed for testing in the laboratory. It is important to be able to establish the residual tensile strength in a fabric during the course of its service life without damaging the fabric. The Bettsometer has been designed to be used in the field, since it is often not practicable to carry out a conventional tensile test by traction on a wing surface, for example.
The Bettsometer takes advantage of the direct relationship between tensile strength and resistance to tearing and it does this without disturbing the structures or surfaces under scrutiny. Used in accordance with the Bettsometer instructions, damage to the fabric will only result if it is below the minimum strength laid down by the overseeing authority or aircraft manufacturer, in which event renewal is assumed to be indicated.
Stitching is equally subject to ageing and weakening by UV and other factors. TheBettsometer can also be used to test thread strength.