Here are a couple of pics via Imgur:
https://imgur.com/R9NHx4D
They probably only weighed around 20 lbs, but they created quite a resistance at 20 mph.  Power washed for 3 hours, still need to hit it again with a hull cleaner.  I was using an acid hull cleaner from Starbrite, but it was too windy for that nasty stuff.  I just ordered a bottle of the non-acid hull cleaner from Booyah.  Curious how well it will work.