After a flight recent flight, I returned to join the circuit (pattern), and as I reduced power to 4000 - 4500 rpm I noticed some unusual & significant new vibration. All had seemed normal on cruise at 5200 -5500 ish rpm while the prop was pulling. On inspection of the prop I found a 5/8 by 5/8 inch flake of paint had departed from the back of the metal strip on the leading edge, approx. 4 inches from the tip. I realise that our props are hollow & made from Carbon Fibre & are very light, but I am surprised that such a small amount of missing weight could affect things so much. Has anyone had a similar situation,or have experience & knowledge to share? Thanks, DEAN