31-35ft 10,000lbs , Danforth*  22lbs-Standard anchor; high-tensile 12 lbs or Plow 25 lbs chain 5/16 rope 1/2 190ft
Horizontal Load (lbs.) 35' 10'beam Lunch Hook, 225 Working Anchor  900 ,Storm Anchor 1800 

35ft ,12ft beam 300’-1/2” Nylon Rode , 3/8” Chain Rode

36-40ft 15,000lbs , Danforth*  22lbs-Standard anchor; high-tensile 20 lbs or Plow 25 lbs chain 3/8  rope 9/16 225ft
Horizontal Load (lbs.) 40' 11'beam Lunch Hook 300, Working Anchor 1200 ,Storm Anchor 2400 

40ft , 13ft beam 400’-5/8” Nylon Rode , 7/16” Chain Rode 35 ft min chain 3/8 , 9/16 rope , 


=====Duck anchor Calculations ============================
Treated as 40 ft due to extra ballast.

Duck Storm anchor Horizontal Load 2400lbs., so use 150 ft 3/8 G-3 chain or  35ft 3/8 G-3 chain & 200ft 9/16 rope, or 35ft 1/4" G-4 chain & 200ft 9/16 rope,

5/16 increases much margin of error 

Duck Working anchor Horizontal Load 1200lbs., so use 150 ft 1/4" pref chain or 35ft 1/4" chain & 200ft 7/16 rope

Duck lunchhook anchor Horizontal Load 300lbs., so use 150 ft 3/16 chain or  35ft 3/16 chain & 200ft 7/16 rope

Drum (Capstan) or  Gypsy 


Short link chain is used as anchor chain, to suit windlass gypsies, and it should be calibrated. Stud link chain is found in larger sizes. 

So for the Duck , 62 lb max for any pre-made chain-rope combo , plus 25 lb anchor = 87 lb total weight  261 minimum

(Short Link) Short link chain is used as anchor chain, to suit windlass gypsies, 

=======Low tensile chain  G-3 or g-30 or BBB or Proof Coil [grade 'L' in Australia. ]
- ~tensile strength 300 MPa.=== BBB Has Compact Links for Extra Flexibility

G-3 Proof Coil Chain 1"     lb/100' WrkLoad ,Typ.Break lb17900 lbs.
G-3 Proof Coil Chain 3/4"   lb/100' WrkLoad ,Typ.Break lb10600 lbs.
G-3 Proof Coil Chain 5/8"   lb/100' WrkLoad ,Typ.Break lb 6900lbs.
G-3 Proof Coil Chain 9/16"  lb/100' WrkLoad ,Typ.Break lb N/Albs.
G-3 Proof Coil Chain 1/2"   lb/100' WrkLoad ,Typ.Break lb 4500lbs.
G-3 Proof Coil Chain 7/16"  lb/100' WrkLoad ,Typ.Break lb N/A lbs.
G-3 Proof Coil Chain 3/8"   lb/100' WrkLoad ,Typ.Break lb 2650 lbs.
G-3 Proof Coil Chain 5/16"  lb/100' WrkLoad ,Typ.Break lb 1900 lbs.
G-3 Proof Coil Chain 1/4"   lb/100' WrkLoad ,Typ.Break lb 1300 lbs.
G-3 Proof Coil Chain 3/16"  lb/100' WrkLoad ,Typ.Break lb  800 lbs.

==========================================
High tensile ~tensile strength 400 MPa.

=======High tensile chain G4, G40 , HT  ================
- ~tensile strength anything much above 500 MPa.
G-4 Proof Coil Chain 3/4"  ??? lb/100' WrkLoad ,Typ.Break lb,  WLL 14000 lbs.
G-4 Proof Coil Chain 5/8"  400lb/100' WrkLoad ,Typ.Break 39000lb,  WLL 13000 lbs.
G-4 Proof Coil Chain 9/16"  ----------------------------------------------------
G-4 Proof Coil Chain 1/2"  300lb/100' WrkLoad ,Typ.Break 27600lb,  WLL 9200 lbs.
G-4 Proof Coil Chain 7/16" 230lb/100' WrkLoad ,Typ.Break 21600lb,  WLL N/A lbs.
G-4 Proof Coil Chain 3/8"  176lb/100' WrkLoad ,Typ.Break 16200lb,  WLL 5400  lbs.
G-4 Proof Coil Chain 5/16" 120lb/100' WrkLoad ,Typ.Break 11700lb,  WLL 3900  lbs.
G-4 Proof Coil Chain 1/4"   84lb/100' WrkLoad ,Typ.Break  7800 lb,  WLL 2600 lbs.
G-4 Proof Coil Chain 3/16"  lb/100' WrkLoad ,Typ.Break lb,  WLL lbs.

==========================================
High tensile chain G7, G70 , HT  Galvanized  tensile strength of 700 MPa================
galvanizing process can reduce the strength slightly (the manufacturer should adjust the Working Load Limit accordingly, e.g. down by 10%). 

=======================
SSht Proof Coil Chain 1"     lb/100' WrkLoad ,Typ.Break lb lbs.
SSht Proof Coil Chain 3/4"   lb/100' WrkLoad ,Typ.Break lb lbs.
SSht Proof Coil Chain 5/8"   lb/100' WrkLoad ,Typ.Break lb lbs.
SSht Proof Coil Chain 9/16"  lb/100' WrkLoad ,Typ.Break lb N/Albs.
SSht Proof Coil Chain 1/2"   lb/100' WrkLoad ,Typ.Break lblbs.
SSht Proof Coil Chain 7/16"  lb/100' WrkLoad ,Typ.Break lb N/A lbs.
SSht Proof Coil Chain 3/8"   lb/100' WrkLoad ,Typ.Break lb3550  lbs.
SSht Proof Coil Chain 5/16"  lb/100' WrkLoad ,Typ.Break lb2850  lbs.
SSht Proof Coil Chain 1/4"   lb/100' WrkLoad ,Typ.Break lb  lbs.
SSht Proof Coil Chain 3/16"  lb/100' WrkLoad ,Typ.Break lb  lbs.

G50 stainless is about the best available.
==========================================

7:1 scope is great, but crowded anchorage 3:1 or 4:1.

opt chain/nylon combo for vessels <50ft. in 30 ft. water c storm conditions is 20% chain,80% nylon rode with c overall scope of 6:1. 
Assuming that boat's bow chock 6 ft > water level,waves are 4 ft(8 ft peak to trough) yields a 240 ft total rode comprised [48 ft chain, 192 ft  nylon]
Clearly extreme conditions. In  water the could be reduce rode proportionately,if shallower.But chain require approximates~ 1 boat length &

Rule combined rode=boat length chain + qs nylon = 6:1 scope.
If Shallower, > scope 7:1 [swing limits],permits bow 2 lift more easily c choppy nearshore waves 

In summary, at a fixed depth, longer rode, less chain required. 
The shortest rodes are all chain, heavier the better, penalty= >wt.& diff.handling difficulty, & incr.chance failure if chain stretches taut. 
========
Chain Length 

Chapman’s 1/2 ft chain ea. ft boat length. 

But Earl Hinz,The Complete Book of Anchoring and Mooring, “the chain lead should weigh at least as much as the anchor whose weight it is supplementing”. 

From his experience, he has determined that the length of the chain lead has nothing to do with the depth of the water or the length of the boat. He suggests using the following formula to help you determine the minimum
length of chain lead you will need: 

Minimum              Anchor weight in lbs.           Anchor materials factor =
length of     =     x Anchor materials factor                1 for steel and 
                   --------------------------
chain lead         Unit weight of chain,                    1.6 for aluminum
                          lbs./ft.
For example: 

7-lb. Fortress aluminum anchor c 1/2” twisted 3-strand nylon rode, min. 11.2 lbs. 5/16” proof coil chain [weighs 1.15 lbs./foot] Therefore, need min. 9’8” of chain.

===========================

a mere 3:1 or 4:1 scope is ok if you're using all-chain rode

===========================

8 Plait Rope And HT Chain Anchor Rode 
9/16" x 270' - 8 Plait Line
5/16" x 30' - HT Chain
Item #:  	001452
Manufacturer:  	Defender Splicing Service
Model #:  	PCR3
Shipping Weight:  	57.00 Lbs.
Our Price: 	 $329.99

Specifications:

    Rope: 9/16" x 270' Long - 8 plait
    Chain: 5/16" x 30' Long - G4, HT chain
    Total length of anchor rode is approx. 300 feet. 

Features:

    Anchor rodes complement rope chain gypsies fitted to all major windlasses
    Chain is hot-dipped galvanized to minimize corrosion
    Chain is welded for high strength; claibrated for even pitch
    Eliminates hockling and kinking
    Resists stiffening with age 

Features of 8-Plait Rope:
    
8-Plaited nylon rope eliminates some of the service problems associated with the 3-strand ropes.
 
8-Plait uses 8-individual braided strands woven together that allow the rope to be relaxed. But, when under load, it tightens up to a firm lay. 
The higher the load the harder the lay becomes.
    
8-Plait carries the same tensile strength as 3-Strand.
    
8-Plait does not coil or create a "birds nest" in the locker like 3-Strand will. 8-Plait flakes and falls upon itself.
    
8-Plait will not twist and knot up.
    
8-Plait will not loop over onto itself.
    
8-Plait has less stretch so it will not bury itself deep into the gypsy's grip when overloaded, 
which means less damage to the stripper when the windlass is abused or overloaded.
    
8-Plait pays off of the windlass into the locker much like chain, allowing for better use of smaller locker designs.
    
8-Plait is 80% less prone to becoming stiff when used in salt water than 3-Strand.
    
8-Plait nylon rope is 1/3 more absorbent than 3-Strand rope. 
More absorbent means more weight; more weight means better fall into the anchor locker.
    
8-Plait should be soaked in water (salt or fresh - it does not matter) to pre-lubricate the rope so it can be used in the windlass initially. 
When rope is used dry and new, we have seen either slippage or sticking in the rope pocket of the gypsy. 

Once the rope is wet and used, it out performs the 3-Strand. The longer it is used the better it gets. 

Note: Custom rodes always available. Please call customer service at 1-800-628-8225, or email custserv@defender.com
  

==================================================================================

Item 	Product 	Model 	Shipping Weight 	Quantity 	Remove 	Unit Price 	Ext. Price


012222  Maxwell RC10-8 Vertical Rope / Chain Windlass  	RC10-8 CAPSTAN 12V 	 55.00 Lbs.  	$1,739.95 	$1,739.95
MAP price: $2174.25 -  Our Price: $1739.95 -  You are saving: $434.30


001493 	RC8-8 Vertical Rope / Chain Windlass  	RC8-8 CAPSTAN 12V 	46.00 Lbs.	$1,349.95 	$1,349.95
MAP price: $1627.12 -  Our Price: $1349.95 -  You are saving: $277.17