don't be daft.

The idea is the cubit would have been based on a royal forearm, not the average male.

Scientifically the ancient Egyptian population would have been various sizes according to the statistical bell curve just like we are.

As I say, my forearm is 50cm, and I am 5'10. Its quite easily conceivable that an Egyptian royal of the 3rd dynasty had a 52.3cm forearm.

How is this difficult to understand?

Dave Light.