We recently had a member of our club pass and he had over a 100 plan sets. Many were of commercially made models but some were of obscure design. I ended up tossing many of the plans and there was a few sets in tubes. One tube was marked PT19 and I was just about to toss it in the recycling when something told me to look inside. When I opened it up it was a full set of plans for the 1/4 scale Schneider Cup Supermarine racer. Looks like I might have something new to build!