A yawl has a much smaller mast
than a ketch
. The amount of extra sail area is negligable and you wont gain much from it. As for balance, I don't believe the yawl mizzen would make any difference as far as unbalancing when sailing. If anything, a yawl would help in balance. A yawl is basically a sloop
with a tailfeather. The only problem I see would be the technical aspect of finding a solid enough base for the tabenacle.
The yawl configuration would help balance the boat both at sea and at anchor
, but not real gain in 'power'. If you want more power and balance, you will need a ketch