Header Photo: National 12 on her side, circa 1960's
At least I think this is a clinker National 12. The sailing kit seems typical of English dinghy sailors of the 1960's; short shorts matched with a non-descript woolen sweater (and English sailing waters are generally not warm!).
The National 12 is one of two English development classes that have been around since pre-WWII (the other is the International 14). The National 12 is a two-man/woman hiking class without spinnaker. Around 1970 they dropped the clinker construction and now are round-bilged or single/multi chine in hull shape. They are flared wide for hiking power with a narrow waterline, somewhat similar to our Classic Moth Mistral design. (The Mistral is very much a Vee'd shape and the National 12's are not - both, however, are roly-poly.) The latest National 12 designs sport the Bieker rudder wings which fools the stern wave into thinking it has a longer hull going through (an expensive contraption as the rudder mount needs to pivot as well - all adjustable while sailing). The National 12 also appears to be the only class to retain transom sheeting (sheeting off the back of the boat rather than the middle).
A video from Tim Laws. (If anyone wonders what class of sailboat the small yawl that appears interspersed throughout the video, that is the Salcombe Yawl, a hot local racing class in it's own right.)
Bald but my eyebrows are growing at a prolific rate. Sailed Windmills and Y-Flyers in the 1960's. Founded Miami University (OH) sailing team. Sailed International 14's and Lasers in the 1970's. Sailed International Canoes in the 1980's to mid 1990's. Sailed Classic Moths since 2002. Enjoy boatbuilding though I'm very, very slow at it (the Internet doesn't help matters). Name in real life: Rod Mincher
After choosing this username (Tweezer is the name of my Classic Moth), further research on the Internet turned up that Tweezerman is a corporate name for a line of pedicure products. Let me emphasize that I do not work for, nor endorse these products.