Hpeer:
No criticism meant, but if I may be so bold: "Backing and filling” is an evolution performed in square rigged ships, and refers to deft trimming of square
sails in order either to go about or to wear in a confined space. Nothing to do with maneuvering under
power.
I believe what you mean is what I, not knowing ,or perhaps having forgotten, a "proper" nautical term for it, call "doing a pirouette". i.e. alternately using forward and reverse
gear in order to capitalize on prop-WALK when going astern and on prop-WASH (impacting the rudder) when going forward. The secret is to take advantage of the time lag between the slewing ("twisting") occurring, and the beginning a little later in time of making way, either head-way or stern-way.
J314erre and hpeer:
This is a standard evolution in handling single screw
power vessels and not hard to learn, though of course, a certain amount of systematic thinking is required as well as a sensitivity to what the ship is actually doing at every moment of the maneuver.
Since you use the pronoun "we", I take it you are not single-handing. Take a leaf from the book of ship maneuvering where the helmsman and the conning officer are two different persons. In TrentePieds we do it just for the fun of it, and because it solidifies the teamwork that is desirable in a boat. Generally MyBeloved is the "engineer" and I am conning officer-cum-steersman.
There are, just like on a real
engine room telegraph, seven positions: 1) "Stop" - This is shift in neutral, throttle at idle (950 RPM) 2) "Slow Ahead" - this is shift in forward
gear, the "throttle" at idle. 3) "Half Ahead" - this is shift in forward, throttle at a position giving 1,250
RPM, and 4) "Full Ahead", shift in forward, throttle at a position giving 2,450
RPM. 5), 6) and 7) are, of course, the same as 2), 3) and 4) but with the shift in Astern.
Now, all MyBeloved has to do is execute my "suggestions" [women don't like taking orders :-)!] promptly and proficiently, and Bob's me uncle!
In a confined situation, the "normal" position of
engine controls is "STOP", The boat moves on her forereach if she is permitted to move at all. Speed of TP is controlled NOT WITH THE THROTTLE, but by momentarily moving the shifter to "AHEAD", then returning it to "STOP". The same is true when making sternway. This is done on the conning officer's "suggestions".
In TP we do not (in common with most small boats) have a
rudder position indicator. No need for a separate instrument. The
wheel itself IS the position indicator by virtue of the Turk's
head knot that is at the “12 o'clock” position when the
rudder is midships.
Steering orders are really simple, e.g “Port a hand”. Under power in open
water, that constitutes the “standard turn”. “Port a spoke” yields a rather drastic turn if (at cruising speed of 6 knots) it is held. However, when lying dead in the
water while maneuvering to dock, “Starboard a spoke” is the deflection that works well with “half ahead” to make the prop WASH kick the stern to port.
As soon as she gathers way, we come to 'STOP”, while leaving the rudder a spoke to starboard. And then after a few seconds we come to “Full Astern”, that stops the gathering headway and the prop WALK takes the stern further to port. Again as soon as she begins to gather way, we come to “STOP”, and after a few seconds ”Half Ahead”, The stern kicks further to port due to the prop WASH.
Going through this procedure repeatedly causes the boat to do what I call “a pirouette.” She spins around her pivot point which is more or less midships, and I can easily do it in a thirty foot boat without transgressing on a the periphery of a 50 foot circle. And as many times in a row as you like :-)
I lie port side to, about 300 yards up a fairway with a 40 foot clearance. I come in forwards controlling my speed as described above. Opposite my berth which is now on starboard, I lay 'er dead in the water. Then I “do a pirouette” to present my port side to the pontoon. Due to local topography the
wind is always across the pontoon and the tidal set along the pontoon. If the
wind blows me onto the pontoon, all I have to do is wait, and the wind will do the rest of the job for me. If the wind blows me off the pontoon all I have to do is “nose in” obliquely, set a spring from midships leading aft and come to “Slow Ahead” with the rudder a spoke to starboard. The force-couple set up by the spring and the thrust then brings in the stern.
You will find that doing this evolution a dozen times will make it second nature. It's really quite simple.. But I do recommend that you practice in open water till you are absolutely confident in your boat's responses. Every boat will have a peculiar response, but it doesn't take long to
work out what YOUR boat's responses are.
Have fun :-)!
TrentePieds