Hi

Thank you to all that replied. Glider RN and a reply I have received privately, provided all the information I require. To conduct such a test is clearly an exacting endeavor, requiring a thorough preparation.

On the positive side, I have thoroughly enjoyed a flight in utterly still air ( I have not yet experienced wave flight). Also thanks Martin for suggesting Akafliegs, I am sure their method would also be informative.

Cheers

Paul