Arne Kverneland wrote:

Set the LOA free

Now that the loaded displacement has been increased to 3000kg, it appears to me that the set LOA limit of 26’ or 8m is too short. Initially the displacement was set to 2500kg (right?) and that would be ok in an 8m boat.

No, the displacement was always set at 3000 kg: I wanted the same length as I have now, but felt it should be designed to carry more weight than my existing boat.

There are several good reasons for setting the LOA free, resulting in a 9m boat (or thereabouts):

• ·         The boat will sail better, in particular to windward and in a seaway. Higher speed means less leeway. The result is more sailing and less motoring.

• ·         The boat will be faster or use less fuel when motoring, even with the same engine as was planned for the 8m version.

• ·         As a result, over time, the longer boat will save fuel costs.

• ·         The sail area does not need to be increased and there will be better room for the JR sheeting, which will solve many of the problems seen on short junks with very steep sheeting angles.

I don't think it's necessary to have a low aspect ratio rig on the boat, so there should be no real need for very steep sheeting angles.

• ·         That extra meter of waterline length will make the interior less cramped. Adding a few inches here and there will make a lot of difference in use.

• ·         Building the thing will probably be easier, as the planking will be straighter, as long as the beam is not increased as well. The extra material cost will add a minor percentage to the whole building budget. Remember, a 9m 3-tonner will not need more equipment (winces, anchors, radios etc) than an 8m 3-tonner.

• ·         Since the Sib-Lim is mainly to live at anchor and not be using marinas, I cannot see that one extra meter of length will generate much extra costs of keeping, except for a few teacups of paint.

As it is now, I can’t help feeling that the tight LOA limit tends to result in contenders that look a bit cramped inside and tubby outside, which probably will result in reduced comfort and sub-optimal performance.

Cheers,
Arne

One of the things that has really surprised me, and continues to do so, is that my 8 metre boat really does seem to be able to shoehorn herself into anchorages where there would apparently be no room for a longer boat.

Iain Grigor wrote:

Okay, what about the Tilikum 32' centreboard barge, from Tad Roberts Yacht Design?  Twin centreboards, draught 1'8" boards up, junk yawl, circa 33% ballast ratio, sa/dislacement 17 to 1.  From the profile drawing, this strikes me as a very sexy and versatile boat.  Perhaps she could be scaled down a bit, for Annie's needs?

Arne Kverneland wrote:

Set the LOA free

Now that the loaded displacement has been increased to 3000kg,

The boat has to be simple to build and inexpensive

About 3 ton(ne)s displacement.

Hull: 26ft (8m) or less, wood of some sort.

Set the LOA free

Now that the loaded displacement has been increased to 3000kg, it appears to me that the set LOA limit of 26’ or 8m is too short. Initially the displacement was set to 2500kg (right?) and that would be ok in an 8m boat.

There are several good reasons for setting the LOA free, resulting in a 9m boat (or thereabouts):

• ·         The boat will sail better, in particular to windward and in a seaway. Higher speed means less leeway. The result is more sailing and less motoring.

• ·         The boat will be faster or use less fuel when motoring, even with the same engine as was planned for the 8m version.

• ·         As a result, over time, the longer boat will save fuel costs.

• ·         The sail area does not need to be increased and there will be better room for the JR sheeting, which will solve many of the problems seen on short junks with very steep sheeting angles.

• ·         That extra meter of waterline length will make the interior less cramped. Adding a few inches here and there will make a lot of difference in use.

• ·         Building the thing will probably be easier, as the planking will be straighter, as long as the beam is not increased as well. The extra material cost will add a minor percentage to the whole building budget. Remember, a 9m 3-tonner will not need more equipment (winces, anchors, radios etc) than an 8m 3-tonner.

• ·         Since the Sib-Lim is mainly to live at anchor and not be using marinas, I cannot see that one extra meter of length will generate much extra costs of keeping, except for a few teacups of paint.

As it is now, I can’t help feeling that the tight LOA limit tends to result in contenders that look a bit cramped inside and tubby outside, which probably will result in reduced comfort and sub-optimal performance.

Cheers,
Arne

Talking about Tad Roberts designs, I'd say that this one the Harry 26, pretty much does everything Annie wants. Tad has even designed a junk rig for it.