It is not entirely comparing like with like
I compared the windage of our Lightwave 38 (edit - multihull
, cat, close edit) with a Bavaria
35 and a Bavaria
45. Based on the idea that windage is a function of both bow on and side cross sectional area then our windage was very similar to that of the Bav 45 (and the Bav 35 was 30% less). I excluded mast
, boom and furled sails
. I also excluded the idea that cruising monos quite often have significant development over the transom, targas with solars, davits
We use a 15kg SARCA Excel and have done for almost 10 years now. We sit out Storms though the highest registered windspeed we have measured is 55knots on one anchor
However if we have the time and the forecast
we would deploy 2 anchors, in a 'V'. Our second anchor
is the same size as the primary. Its better to be over 'anchored' if possible. The number of times you need to be over anchored are not that many - Storms are rarely suffered, good anchorages
are good because they provide shelter from Storms, forecasts are surprisingly good (allowing opportunity to move to somewhere more sensible).
The majority of owners carry anchors larger than recommended - we appreciate this but have not found it necessary.