Calculating Ballast ratio for MAB with no accurate data

[Gone sailing]

Original brochure details on this site http://www.cheverton.org.uk/caravel.html

Mike Winter tell us that the Cheverton Yard on the Isle of Wight, built Caravels in the 1950s, prior to the yard being sold to Fairey Marine after which it concentrated on military craft. Mike has this boat moored in Weymouth is looking to contact other owners of David Cheverton boats with the thought of starting a club if one does not exist at present. He can be reached by email at ifamike@btopenworld.com"

They made wooden yachts up to the mid 60's and we're not sold to Fairey Marine until 1983.
Along with the Cheverton website www.cheverton.org.uk there is also a Facebook group. https://www.facebook.com/Chevertonyachts