On the topic of anchors and anchoring. Does anyone have any thoughts on kelets or "anchor buddies"? On May 13, 2014 12:41 PM, "Rick Brass via CnC-List" <[email protected]> wrote:
> Many years ago, a salty old retired USCG chief taught me the rule of thumb > that you should have one pound of anchor and one foot of chain for every > foot of boat length. > > I decided this current discussion would be a good time to double check > that rule of thumb. > > I was pleased to find that Boat/US mAkes the same recommendation. Fortress > anchor calls for less weight in their aluminum anchors, and a relatively > short length of chain to help in setting the light anchor. But for steel > anchors and a 30 knot wind, Fortress also says the pound/foot/foot system > is recommended. > > Mark, I have to agree that 5/8 anchor rode is more than you need. > > I also use 1/4 HT chain and 1/2" 3-strand for the anchor rode on my 38. I > do have 65' of chain in each rode and oversized anchors, because once the > anchor is down I want it to stay down. > > According to what I found this morning, the load on a typical sailboat at > anchor in various wind strengths is: > > @15kt. @30kt. @42kt. @50kt > 30'. 175#. 700#. 1400#. 2800# > 35'. 225. 900. 1800. 3600 > 40'. 300. 1200. 2400. 4800 > > > Max working load of New England Ropes 3-strand is 1/3 of break strength (I > prefer to use 25% in sizing the line myself). Break strength for various > sizes are: > 3/8. 4400 # > 1/2. 7800 > 9/16. 9400 > 5/8. 12,200 > > So 1/2" rode should be adequate for a 30' boat in almost 50 kts, a 35' > boat in 42+, or a 40' boat in well over 30 knots. I will almost always > deploy a second anchor if the winds will be 30+. > > As far as what chain to use, the working load for various size chain is: > Proof coil. HT (G4). BBB > 1/4. 1300. 2600 > 5/16. 1800. 3900. 3800 > 3/8. 2650. 5400 > So one could use big chain to increase catenary and help the anchor stay > set, but 1/4HT is strong enough for up to a 40' boat in any reasonable > conditions. > > Rick Brass > > Sent from my iPad > > On May 12, 2014, at 23:42, Jim Watts via CnC-List <[email protected]> > wrote: > > Considering I use 1/4" HT chain and 1/2" nylon for Shift, I have to agree. > 3/8" nylon would be appropriate to give enough stretch with strength. > > Jim Watts > Paradigm Shift > C&C 35 Mk III > Victoria, BC > > > On 12 May 2014 17:59, Chuck S via CnC-List <[email protected]> wrote: > >> Mark, >> Sounds like you are building a hurricane proof anchoring system? 5/8" >> nylon is hard to get onto cleats smaller than 10". Just sayin. >> >> Following Chapman's, I tried 5/8" docklines and found I could never get >> them over my 6" and even 8" cleats. I use 1/2" nylon three strand twisted >> for lunch hook and 1/2" stretchy double braid for tougher situations. 36' >> and 11000#. Gave more than 200' of 5/8" nylon docklines to my >> brother-in-law for his clamboats. >> >> If you are committed to your present system, you should check out Wichard >> for amazingly strong schackles in small sizes. Their SS is the strongest. >> >> Chuck >> Resolute >> 1990 C&C 34R >> Atlantic City, NJ >> >> ------------------------------ >> *From: *"CNC boat owners, cnc-list" <[email protected]> >> *To: *"CNC boat owners, cnc-list" <[email protected]> >> *Sent: *Monday, May 12, 2014 1:52:33 PM >> *Subject: *Stus-List Shackles and chain >> >> >> >> Needed to replace the chain and shackles on my anchor - the existing >> shackles needed to be cut off with a cut-off blade (totally corroded). >> >> Bought 16' of 5/16 galv chain to add to connect the 27lb Kingston plow >> anchor and the ~250ft of 5/8" rode. >> But I was surprised to find that I couldn't fit the U of a 3/8" shackle >> (or even a 5/16") through the 5/16 chain. Everything I read said I >> should bump up the shackle one size from the chain to maintain working >> strength - but given I couldn't fit the ends of the U through the chain >> links I had to use 2 shackles on the anchor --- one with the pin through >> the anchor and a second shackle reversed with the pin through the chain >> link. >> >> Is that normal? I tried chain a 2 different locations with same results >> >> Mark >> >> -- >> >> >> There is no cure for birth and death save to enjoy the interval. >> - George Santayana >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] >> >> >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> [email protected] >> >> > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > [email protected] > >
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]
