So I have this old boat , Waione and I'm curious about her displacement. I have a pretty reasonable idea based on empirical information but I wonder if with the following data some confirmation might be able to be gleaned.
The boat is a 3 skin kauri hull of 41 ft on deck x 8'6" beam x 6'3" draft, 31 ft waterline ( overhangs in spoon bow and counter)
My guess comes from published information on similar sized types and shapes, plus asking experienced haulout men their opinion. She's never been on load cells and the travel lifts are notorious for their innaccuracy ( not that she's been on one of those for a while either)
Here's what I have and its obviously only best estimates but......
waterline plane of the boat ( graph paper drawing and assessment)of 17.5 sq M( 188.37 sq ft)
When I removed 310 kg from the boat I measured what effect it had on the waterline. The effect of removing 310 kg (683 lds) was to lift the boat an average of 20mm ( .787 " . Probably use 3/4 inch would do.)
In other words, .. I removed 683 pounds from a 188 sq ft w/l plane boat and it lifted the waterline out of the water 3/4 inch.
Can that be extrapolated into a guideline displacement figure?
[ 10-10-2005, 05:23 PM: Message edited by: John B ]