For just a little more than the cost of buying
an additional outboard and then modifying your bowsprit
to support the motor low enough in the water
to work as a thruster you could install a real bowthruster.
You may also find that stopping your boat just before entering the slip long enough to install the motor at the bow will have some sad results depending on wind
. Sailboats, particularly, tend to not stay in one place long if there is any breeze or current
. You would likely be rigging
far from your slip and away from anything you could drift into.
Regarding a come home motor when your diesel dies.
My current boat is 44 feet long and very heavy. While bringing it home the first time the transmission
failed about 20 miles from home on the ICW
. We couldn't sail and I didn't want to get towed($$) so we used our dinghy
. I was inspired by an old John Wayne movie
when his landing support ship was disabled. All the small craft were put alongside and brought him home! Oh, where was I?
Yes, So anyway.
Our dinghy motor is a 9.9. We put the avon
alongside and warped the boat the over the final leg of the trip at at over 5 knots steering
from the helm
. The last few miles were on the Chesapeake under sail and I left the avon
alongside for maneuvering into the slip later.
perfectly the whole way home.
Just another thing to think about.
One potential problem you might encounter with mounting an outboard on the stern of a larger sailboat is keeping the prop in the water. Especially in a following sea.
All that said, If you follow through with your plans please post photos!