there are essentially two quite different solutions, which are both called "drogues".
One lets call a 'medium speed drogue'. Mostly these are single
element drogues like the galerider, delta
drogue and shark. There purpose is to keep the stern pointed into the waves and to limit surfing, but to allow the boat to have some decent speed (7kts or so) to also minimize wave impact and maximize rudder
control. The downside of these solutions is that in very steep waves they can pop out of the wave face and allow you to surf uncontrolled some distance before the reattach to the water. They can do this even when weighted. Or in very severe breaking waves they may just simply not have enough surface area/drag to hold the boat thru the wave strike.
In this category, we have personally used the galerider and delta
drogue. Both worked well. My favorite is the galerider, for two reasons - the wire mouth seems most stable and because it can also be used to help recover a man-over-board. I have only seen an early shark prototype tested, and it seemed to me to perform ok but not outstanding.
The second lets call a 'low speed drogue'. The series drogue is the typical product here. The idea here is two fold - (1) more surface area to hold the boat more firmly thru the most severe breaking waves, and (2) spread that surface area out over several/many cones so that they are not all in the same wave face/same disturbed water at once so they can not all come 'unstuck' like the above single
element drogues can. The downside here is two fold - they are harder to recover and I find people are reluctant to use gear
(and put off deploying it) when they know it is going to be a lot of work to get it back. and second, you are moving slower so wave strikes hit the boat harder.
We have both an 'official' series drogue, with all the (150 I think) little cones, and I have also modified two single element drogues (added strops thru their middles) so I can deploy one, and if I think I need more I can shackle on more rode
and deploy a second, and then a third. This has most of the advantages of the official series drogue, but is a more flexible and easier to recover solution. It is also easier to stow, since it uses existing anchor
rodes and warps rather than its own completely dedicated rope
(like the series requires).
Now, you are looking for an emergency steering solution. So you want a 'medium speed' drogue, but you probably also want it just a bit smaller than the recommended sizing to allow a bit more boat speed. You don't want or need as quite as much drag for this particular application, but you do need drag, about 1kt or 1.5kts worth for it to work.
Btw there is a good test and write up of emergency drogue steering here: http://bermudarace.com/wp-content/up...t-a-Rudder.pdf
. Its on a monohull
, but most will apply to a multi except you have it a bit easier because you already have a lot of beam. He is using a galerider.