In response to Hans Grasman’s query on the 350 Association forum, I am responding here because I have forgotten my user name and password.
Hans: I think the devices you are thinking of are Weaver Davits (Google them). They are widely used by power boaters and virtually never used by sailors.
I have employed Weaver Davits on a power boat and they have held up under the pounding of 45 miles per hour runs so a sailboat mounting would present no challenge at all.
I would recommend taking the outboard off the dinghy when it is mounted on the davits. Weaver will tell you that it is ok to run with the outboard mounted but I had trouble with the glued-on attachments on the dinghy because some of those 40 mph runs were with the outboard left on.
Do not forget your motor will be on its side when on the davits. So a four stroke will have to be aligned correctly. Weaver sells a widget that keeps the outboard upright.
The reason you hardly ever see them on sailing boats is that the transoms of sailing boats are generally a lot narrower than power boats. This means that on a traditional sailing boat the dinghy will stick out beyond the sides of boat when mounted on the davits. Some fear that it might even drag its nose in the water when sailing upwind. I do not think this will be a problem with a small dinghy on the back of a 350 with its vast rear end.
A dinghy mounted on Weaver Davits will tend to block access to the swim platform so you will not be able to use the platform when docked. This may or may not be a problem. Obviously you will not be able to drop the swim ladder with the dinghy on the davits. (Probably not a requirement)
I remember reading an article a few years ago of a similarly mounted dinghy (I do not think it was a Weaver installation) that provided its 27 foot parent boat and owner with a lot of protection against following seas during a nasty little storm in the English channel so I personally would leave the dinghy on the davits if I got caught in bad weather. (You may want to make your own decision in that situation.)
I have not used other types of davits so I do not know how they behave in bad weather, but remember dinghies are held rigid in Weaver davits which I think is a plus.
If I ever get round to installing davits on my 350 I think I would use the Weaver system. It is a lot cheaper than conventional davits, is infinitely less aesthetically intrusive than conventional systems, is lighter and gives a slightly shorter overall length when the dinghy is mounted. However, so far I have got away with a piece of string and I cannot bear drilling holes in the gel coat.
Michael Aston
Windhover, hull#120
email
michael.aston@brucepower.com