Of the home built boat designs on the net, I only know of 2 designs which issue hull numbers to builders when their boats are built and publish them openly on the net: Mouseboats and PDRacers.
It seems like the rest of the designs record the number of plans sold, not actual hulls built.
In our hobby of building boats, many people will buy plans that they never intend to build (I am very guilty of this), so their total number of built hulls is hard to determine.
Here are 2 graphs that show the actual number of PDRacers built, so you can see our growth rate.
Before graphing this data, I tried to predict in my head what it would look like, and I envisioned a more lumpy growth pattern with a ski jump at the end.
Now that the data is charted, it resembles more of a straight line growth pattern.
I do know of a few PDRacers that have been built, but never registered, so there may be a few or a lot more out there.
One nagging question I have wondered about for a long time -- Is there a annual boat building "season"?
From looking at the data, I think the answer is YES, and it is in the July area.
Since a PDRacer is fairly quick to get to the 3D stage when you can register it, that would lead me to belive the date they were completed and registered is most probably close to the date they were started, or atleast the majority of effort put into building the boat.
