Boom Vang Measurements & Fittings

[Anonymous]

The intention of the recent rule amendmants proposed by the Victorian committee was to remove the restriction on fittings used and to remove the vang measurement point on the boom. The removal of the restriction on fittings was passed but unfortunately the removal of the measurement of the attachment point on the boom was not. This means that there is some confusion about what point is measured if alternative attaching methods are use. We will be proposing another change to either remove the measurement point or to define it so that any attachment method can be used without risk of it failing to comply with rules.

[Anonymous]

What about making the vang rule a maximum measurement from the aft face of the mast to a point on the top edge of the boom? The vang and all boom attachments (or an extension of the line of the vang), when rigged as for sailing, must intersect the top edge of the boom forward of this point. This would cover any type of attachment.

[Anonymous]

I reckon Andrew’s suggestion is a good one. It would tidy up an uncertainty that currently exists.
What I don’t get is why it is taking so long to get the rule clarified.

Matt
1697
Zahir

[Anonymous]

I concur Matt,

Here is a link to the Spiral class drawings for measuring boom vang attachment. Measurements are based on extrapolating the bearing point to the centre of the spar, and having a max and min distance back from the aft edge of the mast.

http://www.spiralsailing.org/The%20Dinghy%20and%20the%20Association_files/class%20drawings.pdf

FYI,
Sue

PS I hope I don’t get into trouple for using the S***** word.

[Anonymous]

So the current situation seems to be that we don’t have to use a fitting that is no longer made but we do have to comply with the class rule which does not exist.

Please correct me if I am wrong….

😆

[Anonymous]

Hi Sue
The Spiral (there I’ve said it) seems like a good solution. All it needs is a dinky little diagram and a measurement and away we go all happy.

I’m new to the class and maybe I’m missing something, but it seems like an eternity to get this rule clarified.

Cheers
matt.
1696
Zahir

[Anonymous]

Just to revisit this topic. I am in the process of fitting out a new boom & need to clarify the current rule regarding the position of the Vang fitting on the boom. The rules state:

b. The vang boom fitting is measured from the innermost edge of the fitting to the aft
extremity of the mast when boom is fixed onto the mast gooseneck.

This appears to allow a fair degree of latitude in the actual bearing surface / attachment point for the vang, depending on the the exact fitting used. The fitting I am using (off an old – measured – boom) has the bearing surface 11 mm from the front edge of the fitting. With that distance I cannot position it so that both the front edge and the bearing surface are within the measurement tolerance so I wish to be absolutely sure which point it is that the measurement is taken from.

[Anonymous]

The recently adopted revision to the measurment rules specify:

“The forward extremity of the vang boom fitting must be between 665 & 690 mm measured from the innermost point of the fitting to the after face of the mast with the boom fitted to the mast gooseneck, the sail rigged and the vang tensioned.”

This is a small change to the aftermost limit to allow for a bit of stretch in strap type hangers.

It is definately intended that the measurement be made to the most forward point of the attachment fitting and has no reference to the actual hole to which the tackle is attached.

[Author]

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