In this study 100 groups of five participants were used to discover problems with an interface. The study did indeed find that the mean percentage of problems discovered across all 100 groups was about 85%. However, this figure has 95% confidence level and a margin of error of Â±18.5%.
Keelboats were generally built in Pittsburgh, Pennsylvania and it was here that Meriwether Lewis commissioned the boat used by the Corps of Discovery. The keelboat used by the Corps was sketched by Clark in his journal. It was 55 feet long and 8 feet wide, with a 3- to 4-foot draft. For propulsion it had a 32-foot sailing mast, 22 oars, a rudder, and a tiller for steering. Protection against hostile encounters were a swivel cannon on the bow and two smaller guns called blunderbusses.
Beam is he width at the widest point. If the boat is 4 feet 6 inches it seems narrow, but what kind of a boat is it. If it is a kayak or canoe it is quite wide. it means the beam is 54 inches. the beam of a boat is the measurement at the widest part of the hull from port side to stbd side. so this boat is pretty narrow at 4and a half feet in beam. good luck! I already have a canal boat, moored in a Marina on the Trent & Mersey canal.