A recent question about Project Starshot's communication asks about one of the seemingly insurmountable problems with this project.
There is however another problem that has bugged me ever since I first heard about the project. We are told the craft will consist of an electronics module with a mass of about 1g, attached to a sail of about 1 m^2 which is just a few atoms thick. Then we accelerate the entire craft with a laser, pushing it up to 20% of the speed of light in a few minutes.
A quick calculation shows that we need of the order of 60,000 G to reach that speed. Hence, during acceleration our 1 g mass will weigh 60 kg.
What kind of technology do they envisage to produce a sail that will hold that kind of weight, without tearing or just collapsing under the strain?