A Photo & Discussion Forum for Wharram Design Enthusiasts
I have no practical experience with changing the width but I think the following: Classic wharrams and ancient double canoes were signifcantly narrower than the TIKIs but they were on the other hand much heavier. On my TIKI 21 I fell a big influence of weight on the behaviour of the boat. Cargo and passengers reduce heeling considerably. In my opinion the boat is excellently designed and I personally would not dare to change such important charactaristics as beamlength.
I wouldn't do it. Less space between the hulls decreases the stability, but also decreases the confort when the boat goes up and down in a beam sea. T. F. Jones, a very experienced builder and sailor, in his book "Multihull Voyaging", says "Two of our catamarans, Vireo and Dandy, have waterlines around 23 feet. Vireo's hull spacing is 9 feet and Dandy's is 11 feet. Dandy is incredible more pleasant in a seaway."