Dennis (Windship) and others:
Let me begin by apologizing to you. I believe that gentlemen can disagree gracefully; but the tone of my recent postings may have crossed over the
line of proper decorum.
By way of explanation (not excuse), I was hoping to provoke you to explain your position in more detail. I value the lively interaction the Sailnet Forum provides, and your contributions to the debate. Please don’t let my poor manners reflect badly on the concept of “debate”, and the exchange of differing points of view.
Yes, “Southbound” is abundantly (over-equipped?) equipped with
ground tackle. I’ve never recommended that anyone must emulate my conservative approach to
ground tackle, but it gave me peace of mind, and never let me down. I’m an admitted “nut” on anchoring.
Although I have done a lot of reading on the subject of
anchors and anchoring, I’m not totally without practical experience.
I’ve spent over 4,000 nights aboard several boats, nearly half of them at
anchor.
I’ve also spent at least 20 hours (accumulated time) in the water, observing the
anchor &
rode dynamics, under a variety of conditions (mostly more ‘boisterous’). This was dedicated scrutiny, to which I’d add countless casual observations made when “diving the
anchor”.
The ABYC “Loading Table I” (which I referred to) actually specifies more than I quoted:
30 LOA, 9'' Beam, Sail, and footnoted:
1. When using this table with the LOA or Beam, use whichever gives the highest loading, assuming freedom to oscillate is permitted and moderate shelter from seas proportionate to hull size.
2. Boats with canvass and large superstructure, use the load one category higher than that determined by using the powerboat column.
3. These values include the effect of wind, current, and wave action.
30'' LOA (Sail) @ 9'' Beam - 700# Working, 1,400# Storm, & 2,100 Mooring
35'' LOA (Sail) @ 10'' Beam 900# Working, 1,800# Storm, 2,700# Mooring
Many authorities consider these tables to be very “conservative”.
Sone References that might interest you:
“Tuning an
Anchor Rode” ~ by Alain Fraysee
http://alain.fraysse.free.fr/sail/rode/rode_b.htm
In particular: “Dynamic Behavior (2) - Heterogeneous
Rode”
http://alain.fraysse.free.fr/sail/rode/dynam/dynam.htm
“Anchor Catenary Details” ~ by John Holtrop
http://www.johnsboatstuff.com/Articles/anchor.htm
“Anchor Design Theory” ~ From the Dutch firm Vryhof Ankers
http://www.vryhof.com/PDF/AM2000B.PDF
“
Anchor rode” ~ by Alain Hylas (Inbventor of the ‘Spade’
anchor)
http://www.bluemoment.com/anchorrodes.html
“Rope to Chain Splice Test” ~ by Chuck Hawley (West Marine)
http://www.ussailing.org/safety/Studies/1994ropechainsplice.htm
“Principles and Performance of
Anchors” ~ from the manufacturers of the ‘Flook’
anchor
http://www.dulhunty.com/dmp1.htm#top
“Anchoring” ~ from BoatUS ‘BoaTECH’ Guides (includes ABYC Table I)
http://www.boatus.com/boattech/anchorin.htm
“Anchoring” ~ from the Banjer 37 Motorsailer Club
http://banjer37msclub.tripod.com/workshop.htm
Best regards,
Gord May
Gord@BoatPro.zzn.com