Sorry not getting back. Been real busy with customers boats, competitors boat, and ours getting ready for Paris.
I'll explain this best I can. For the ones going to Paris I can show you and you can see.
A good circle boat Biesemeyer, Revenge, or Frahs,( which were copied from a Biesemeyer) has lap strakes under the hull. That helps provide lift unlike a true flat so it won't stick to the water. Also there are outer chines which help let the boat slice through the turns, not skip. It's almost like a tunnel from the chine to the strake. Also contrary to the belief, there is a v in the hull, not like a true flat. It's like 5 or 8 degree in it. We do have a larger Skaggs, once again to help it slice through the turn.
Now for weight differences. My yellow boat weighs jus a tad over 500 lbs , 510 to be exact. That's with the steering stringer rails, skag, and the plates and transom assy. So probably a little under 5 with a bare bone hull.
Now my red boat probably weighed close to 800lbs. But it was originally was built for ski racing. Also on my yellow boat it has a shorter plate than the red one.
Now these do not make a good drag boat. They will not e.t. At all. Partly where the rocker in the hull is located. It would be like bringing a sprint car to a drag race.
The side boards only do one thing, support the deck. They don't add any weight to it. There only 1/4" think with 10" holes drilled in them. As Julian said one time " the deck is there only to keep the water out. The real secret is on the bottom."
Now some of you know Bill Miller who drives Party to the Maxx (TAF), he also drives Mike Caruthers Dirty Harry circle boat. He said the most fun he's ever had on the water is driving these circle boats.
I hope this clarify some things. If any of you guys going to Paris stop by say hi and I can show the bottom how we set our plates and explain it better. Who knows you might want to buy one and come out and make some laps!