sheet to tiller 'self steering'

[commanderpete]

Thanks Scott

Are ther pros & cons to self-steering by mainsheet vs. jibsheet?

Do you need a set up for both?

[CapnK]

Lechters book is a great resource, and it looks like Scott is having some good ideas! Thx for posting the photos, and keep up the good work!

C'petey - My reading of Lechter (and subsequent experience trying his techniques) is that the jibsheet works better, because that sail and it's sheets are a bit more sensitive to wind angle changes than the main is.

Per Lechter, I have a 4-loop latex bungie thing and another light-line block setup that I have used on both main and jibsheet self-steering setups. To get it working passably, it just takes some experimenting and an understanding of how the sheets are affected when the wind veers (which is easy enough to understand if you've sailed enough, as I think everyone here has).

However, it appears that Scott has moved beyond "passable", and is entering the realm of "Well, I set it two days ago, and there's my intended landfall dead ahead...".

[Scott Galloway]

The wisdom in John Letcher's book and on the above referenced websites on this topic supports using mainsheet tension for a mainsheet-to-tiller steering gear for sailing from close to the wind to a little less than a beam reach. Surgical tubing arrangements like those pictured below are used from the lee rail to tiller to balance the pull of the main. Incidentally, the photo credit for the photo below and the credit for the surgical tubing design goes to the author of http://www.jsward.com/steering/index.shtml

I used that web author's exact measurements and specifications to make up my surgical tubing elastic. My nearly identical surgical tubing device is seen in action in one of the posts above.

The jib-to-tiller arrangement, using jib sheet tension is reportedly best for beam reaching to off wind (broad reach) sailing. My prototype thus far indicates that this will work, but also that this is more a more temperamental system than the main-to-tiller arrangement. It is reportedly best left to longer tacks. John Letcher also provides schematics for using the cam lever and/or a "fools purchase block" arrangement to lighten the load of a direct jib sheet to tiller gear. I have chosen the cam lever approach, which leaves the jib sheet on the winch where I like it, but I will probably recycle my mainsheet-to-tiller vang for double use with the jib sheet-to-tiller gear. The vang just makes minor adjustments easy and facilitates remote operation. Again, this jib sheet-to-tiller gear uses the exact same surgical tubing on the lee side.

So, once you have made up your surgical tubing piece and purchased your blocks, you can use them all on both the main-to-tiller and jib-to-tiller gears. You need surgical tubing, Dacron line, some blocs, some snaps, and two cam cleats or another ay of attaching lines to your tiller. You also need some mechanism (cam lever or vang system) for transferring part of the jib sheet pressure to your tiller for the jib-to-tiller gear. The cam lever can be built of wood and fasteners like my prototype, or of wood, two sheaves and half a cam cleat as John Letcher recommends.

All authors seem to recommend surgical tubing becasue of the linear stretch curve of that tubing over the parabolic stretch curve of bungee cord. However surgical tubing is easily damaged by UV light. Some authors recommend colored surgical tubing as more light resistant

On my system I added a removable steering control box on the tiller and a vang.

I have three (and spare fourth) Garhauer Series 25 ball bearing stainless steel blocks in my set-up and I am using 3/16 and 1/4 inch Dacron line. Low friction blocks are very important. The steering gear box takes two cam cleats, but again, these cam cleats could be directly attached to the tiller. You can also just tie your lines around the tiller. I did that for a while and it works, but that makes adjustment difficult.

My steering box design is flawed at present because of the angle of the approach into those cam cleats on that steering box (over the tiller and straight down). Too much tension on the lines, and you have to work too hard to free the lines. That is one reason that I like my vang set up. I plan to try that also between the cam lever on the jib sheet and the first leeward turning block for the jib sheet to tiller gear. I have a lot of refinements to make yet. I am not ready to go below for a snooze...especially not in coastal waters. I like to keep a look-out. These systems won’t steer around other boats, and they hold a course not by compass, but by the wind.

But while close hauled, I can go forward for hours when sailing if I want to do so, or go below or go below to concentrate on navigation issues, make lunch, etc. Best of all, I can sit someplace dry (or less wet anyway) while Augustine sails herself. My role as Skipper then is not wrestling with the tiller, but tending the sails or the self-steering vang from time to time, and focusing on keeping watch, navigation, and course planning. I hope to achieve that level of control also on beam and broad reaches with some refinements.

A couple of words of caution:

1. Without a tiller in your hand, you tend to look around and not necessarily at the approaching swells. I was thrown across the cockpit by swell that broke against the weather side of the hull, while I was focusing on something else with it was gusting above 20 mph with three foot swells. That wouldn’t have happened if I had been at the tiller. Your automatic helmsman won’t shout warnings to the crew.

2. More so than ever, wear a very short harness. My harness has a three and six foot tether. If you fall overboard the boat will probably never round up. You may be trying to climb back on while beating at theoretical hull speed. Also a lifejacket and a waterproof VHF and/or PLB in your pocket are both good ideas while sailing alone

3. Your system can’t sense other boats, buoys or hazards to navigation. When the wind direction changes so will your heading.

4. Be careful about overloading the points (cleats) where you attach your self-steering blocks by transferring excessive tension from your jib sheet to your steering lines. All you have to do is slack off the jib sheet without first releasing your jib sheet-to-tiller control line to do that.

[Scott Galloway]

After a few months of experimentation, I have settled on what appears initially to be a workable set of sheet-to-tillr gears for my 1965 Ariel, "Augustine". I have been photograhing the various iterations as I have proceeded. My brand new (posted yesterday) Pearson Ariel self-steering web page has been posted on-line for comments and recommendations by others. My intent is to keep the page specific to Ariels (and Commanders), but I am open to great ideas from other types of sailboats.

The URL for that webpage is: http://www.solopublications.com/sailariq.htm

A photo from that page appears below. Both mainsheet-to-tiller and jibsheet-to-tiller gears are shown on the page, with detailed equipment specifications, and links to other on-line and printed resources.

In the jibsheet-to-tiller gear, appearing in the photo below, the jib sheet is lead around the leeward jibsheet winch and then wrapped around the weather side winch and secured to a cleat. See photo #67. One end of a four part tackle (vang "H") is secured by a snap hook to the midpoint (between the winches) of the jib sheet. The other end of the control line attached to vang "H" is run through a series 25 block "G" attached to a pad eye in the center of the rear cockpit bulkhead (where the mainsheet is also attached in this photo). The control line runs from the end of vang "H" through that block and up to a weather side series 25 block "B" on the coaming board and then to steering control box "A" on the tiller.

The system uses tension from the jib sheet to control the tiller, but collects that tension from the transverse section of the jibsheet between the two winches. The tiller senses the tension and makes adjustments accordingly. A counter force is applied by the elastic device "C" at the left side of the photo on the lee rail.

[Scott Galloway]

Once you have seen photo #81 above, this second photo #113 will be easier to understand. Photo #113 shows an improved jibsheet-to-tiller gear that reduces friction in the gear as pictured in photo #81. In photo #81, the gear uses the leeward jibsheet as a fairlead (the jibsheet makes a one quarter turn around the barrel of the leeward winch).

In photo #113, a device identified as "J" slips over the leeward winch. This device positions a block correctly to run the jibsheet across the cockpit to the windward winch. Subsitituting that block for the winch-as-fairlead makes this gear much more responsive and removes overcorrection due to friction in the gear as pictured in #81. Otherwise the two gears are identical.

During my first test sail using this device, I was free to go forward for extended periods while sailing on a broad reach for the first time in my singlehanded sailing career. The boat sailed a steady course on both port and starboard tacks while I took photos. Unfortunately I was so mesmerized by watching the gear work that I kept sailing away on a long broad reach until dusk when the wind totally quit blowing, at which time I decided to drag out the oars.

By the way, device "J" is also featured on the oar lock thread on this forum, since teh device doubles as an oarlock mount for an NRS oarlock and Carlisle 11 foot sweeps. The device is home designed and built from ABS pipe and standard plumbing fittings.

And device "J" also works as an oarlock mount.