All posts by Noel Swanson

Sea Anchors on Catamarans

S/C-8 Catamaran, Kelsall

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S/C-8

Catamaran, Kelsall

36' x 20' x 4 Tons

18-Ft. Dia. Sea Anchor

Force 11-12 Conditions

File S/C-8, obtained from Rick Kazprzak, Kodiak, Alaska - Vessel name Catherine Estelle, hailing port Kodiak, "Tonga Tora" catamaran, designed by Derek Kelsall, LOA 36' x Beam 20' x Draft 18" x 4 Tons - Sea anchor: 18-ft. Diameter Para-Tech on 450' x 5/8" nylon three strand tether and bridle arms of 50' each, with 5/8" galvanized swivel - Partial trip line - De-ployed in a storm in the Gulf of Alaska about 350 miles west of Queen Charlotte Island, with winds of 70-80 knots and seas of 30-40 ft. - Vessel's bow yawed 10° - Drift was estimated to be about 5 n.m. during 48 hours at sea anchor. 

Linda Kasprzak read the second edition of the DDDB and urged Rick to equip Catherine Estelle with a Para-Tech sea anchor. She also saw to it that tether, bridle, hardware and all fitting were ready to take on the Gulf of Alaska.

Rick and Linda Kasprzak left Kodiak on 13 July 1991, headed for Vancouver Island, 1200 miles as the crow flies straight across the Gulf of Alaska. At the half way point they ran into one major storm, one gale, and one minor gale, spending a total of five days tethered to the sea anchor. There were some anxious moments.

The transcript of an official Coast Guard document (CG Juneau, Archive Number 2285) reads as follows: Urgent Marine Information Broadcast - Communications have been lost with the S/V Catherine Estelle endangered by weather in position 53-05 N, 142-65 W. The vessel is a 37 ft. catamaran with 2 persons on board. Vessels in the vicinity are requested to keep a sharp lookout, assist if possible, and advise the nearest CG station.

At the time of this urgent broadcast Catherine Estelle was being held to survival by the long rode leading the Para-Tech sea anchor. Transcript:

The storm we encountered was a major one with a very quickly dropping barometer (1 millibar every 1/2 hour). At the height of the storm we encountered 35-40 ft. seas. I believe I am under-estimating this as the seas were so big that our GPS could not get a fix at times, because it was being blocked out by the huge waves.

Surface analysis chart of the Gulf of Alaska for Sunday 21 July 1991, showing the Aleutian Islands on the upper left, Alaska and Canada on the upper right, and Vancouver Island on the right. Catherine Estelle's position at this time was 53° 15' 42" North, 142° 36' 09" West, which would place her right in the center of the LOW. Note the 2200 mb HIGH to the north. (Courtesy of University of Alaska).
Surface analysis chart of the Gulf of Alaska for Sunday 21 July 1991, showing the Aleutian Islands on the upper left, Alaska and Canada on the upper right, and Vancouver Island on the right. Catherine Estelle's position at this time was 53° 15' 42" North, 142° 36' 09" West, which would place her right in the center of the LOW. Note the 2200 mb HIGH to the north. (Courtesy of University of Alaska).

               Wind speed increased at the start from 40 to easily over 70 knots. The seas were nothing but white spray, breaking crests and huge waves. We have lived in Kodiak for 15 years and so have experienced many a storm, but have never seen anything like we experienced during those 48 hours. The situation was so bad that we were dressed in survival suits and had the catamaran ready so that if we flipped, we could have access to our EPIRB, survival food and water.

The boat handled very well, but it was unnerving to be held to survival by a thin 5/8" line. Sleep was impossible. The sea anchor definitely saved the boat and I'm sure our lives. It operated flawlessly on those 2 days and the other 3 days during the other 2 gales.

We had 50' bridle arms that went through a specially made SS bow plate, but we had also built a U-bolt to this plate. The bridle was encased in 1/4" thick rubber tubing where it hit metal on the plate. We had a little trouble deploying the sea anchor, mainly because we have a seagull striker in front, plus 2 head stays. But once around all that, we were able to set the anchor just fine. Our catamaran rode these huge seas like a duck rides a wave on the sea anchor. But because the seas were so big, we did have a lot of noise due to waves slapping on the under-body.

The bottom line is that the 18-ft. para-anchor operated as you said it would, and with your help, my wife Lin's forethought, and a well-designed boat, we all did what should have been done and came through a very violent storm and survived with NO damage. Mr. Kelsall must be commended on his fine design of this boat.

Rick & Linda Kasprzak have since logged thousands of miles and used the same sea anchor in other marginal situations. In a letter to your author dated 16 September 1991, Rick wrote about one other episode. At the time Catherine Estelle was beating against 30 knot winds and 10-15' seas when a big wave slammed into her. There was a loud bang. A frantic search revealed that a weld had broken on one of her rudders.

The sea anchor was immediately deployed to bring the situation under control and wait for calmer seas. A radio call to the Canadian Coast Guard brought a response from a nearby fishing boat, with an offer to tow the catamaran to Bella Bella (the nearest port).

In the radio conversation that followed, the skipper of the fishing boat expressed concern about the initial pick-up and transfer of tow line in rough seas. He said he had seen more damage occur in this transfer than in any other situation in all the towing experiences he knew of. Rick Kazperzak:

I said to the captain of the fishing boat, "No problem! Just pick up the trip line connected to the red buoy, pull the chute in, bag it temporarily on deck, then cleat the tether and start your tow."

The fisherman had no problem doing this. He towed Catherine Estelle to a small bay in Bella Bella, and then released the tow - dropped the parachute back in the water and went on his way. Rick Kasprzak:

 The point is this: here is another safety use of the sea anchor - towing. Easy pick up of tow line and easy release.

NOTE: When it come to tow lines the Coast Guard will not go along with the above proposition. It has always been the policy of the US and Canadian Coast Guards to use nothing but their own tow lines in all operations. They will not tow a vessel with anything else because they don't want to be liable for failure of the rope - and damage or injury resulting from that failure. See also Captain Bob Proulx's Coast Guard experience in File S/M-23. However, the above proposition is eminently logical when receiving a tow from a friendly fishing boat or pleasure vessel.

SC8
EASY TOW LINE TRANSFER

 

Sea Anchors on Catamarans

S/C-7 Catamaran, Wharram

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WHARRAMS/C-7

Catamaran, Wharram

35' x 17' x 3 Tons

9-Ft. Dia. BUORD Sea Anchor

Force 8-9 Conditions

 

File S/C-7, obtained from Roger Ayers, Ft. Lauderdale, FL. - Vessel name Marney, hailing port Ft. Lauderdale, catamaran ketch, designed by James Wharram, LOA 35' x Beam 17' x Draft 2' 6" x 3 Tons - Sea anchor: 9-ft. Diameter BUORD on 300' x 1/2" nylon three strand tether and bridle arms of 25' each, with 1/2" galvanized swivel - No trip line - Deployed in a low system in 100 fathoms about 25 miles east Cape May, with winds of 35-45 knots and seas of 10-12 ft. - Vessel's bow yawed 30° - Drift was estimated to be 12 n.m. during 6 hours at sea anchor.

 

Marney, a 35-ft. Wharram "Tangaroa" was home-built by Roger and Marney Ayres, who have been chartering, delivering and crewing yachts on the east coast, the Caribbean and Europe. In June '85 they were sailing her to Florida when they were overtaken by a frontal system off the coast of New Jersey. The wind was blowing Force 7-8, contrary to a southerly current, producing steep, short-duration seas of 10-12 ft. They deployed a 9-ft. diameter BUORD. The parachute was not big enough to do an adequate job of keeping Marney pointed into the seas. Her twin bows were yawing about 30° off to each side - through an arc of 60°. The rudders seemed to be under inordinate strain as well. Transcript:

We were caught departing from Cape May with a good forecast of 10-15 knots. As the afternoon wore on and we reached out, the wind freshened. We decided to beat as far offshore as possible, which we did, finally reduced to storm staysail and a double-reefed main. In this, our first real blow in this boat, we were not operating as "professionally" as we might have, and concerned ourselves only with getting offshore in case the wind backed further to the east, not noting our exact position, etc. just beating on [trying to gain ground].

The sea anchor was deployed from the bows, but allowed too much leeward drift (estimated 2-3 knots), and also allowed us to fall back off the steep, short seas, which had built up in the southerly current. I think that falling back off a larger 15 ft. wave at an angle, we broke both tillers. Note that a catamaran with two large transom-hung rudders, when backing into a trough and burying the sterns, exposes two blades, and two sets of cheeks to the force of the water, approximately 4 times the area of a typical trimaran spade rudder. It is therefore essential that this type of boat (like a Wharram) make no sternway, else use the sea anchor off the stern.

We are saving the BUORD for use as a "lunch hook," but now have a 24' diameter parachute for use off the bow.

 

The lineage and heritage of James Wharram designs lead back to the Aka Taurua, 60 ft. double-hulled ocean voyaging canoes with which ancient Polynesians explored and settled every island within 15,000 square miles of the greatest ocean on earth. These ancient mariners used "sea anchors" consisting of stones with holes drilled in them, tethered to the bows by means of hibiscus fiber rope.
The lineage and heritage of James Wharram designs lead back to the Aka Taurua, 60 ft. double-hulled ocean voyaging canoes with which ancient Polynesians explored and settled every island within 15,000 square miles of the greatest ocean on earth. These ancient mariners used "sea anchors" consisting of stones with holes drilled in them, tethered to the bows by means of hibiscus fiber rope.

 

Sea Anchors on Monohulls

S/M-21 Hinckley Sou’wester 51 Yawl

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S/M-21

Hinckley Sou'wester 51 Yawl

51' x 24 Tons, Full Keel & CB

24-Ft. Dia. Sea Anchor

Force 9 Conditions

 

File S/M-21, obtained from Captain Eric F. Roos, Mt. Desert, ME. - Vessel name Windcrest, hailing port Bar Harbor, Hinckley Sou'wester yawl, designed by McCurdy and Rhodes, LOA 51' x LWL 37' 6" x Beam 14' x Draft 6' (11' with CB down) x 24 Tons - Full keel & auxiliary centerboard - Sea anchor: 24-ft. diameter Para-Tech on 400' x 3/4" nylon braid and 100' of 5/16" chain with 3/4" stainless steel swivel - Deployed in deep water about 120 miles south of Nantucket Island in a whole gale with winds of 40-50 knots and seas of 20 feet - Vessel's bow yawed 15° - Drift was 14 n.m. during 23 hours at sea anchor.

Windcrest was en route to Bermuda from Bar Harbor when she ran into bad weather. Transcript of feedback obtained from Captain Eric F. Roos:

Para-Anchor was deployed due to deteriorating weather conditions close to the North wall of the Gulf Stream. Our weather forecast indicated that if we continued on our present course a large frontal system would pass over us just as we entered the Gulf Stream. We chose to sail away from the building seas near the stream and set our para-anchor while conditions were still tolerable and we still had daylight.

There was no sudden wind change, but rather a consistent increase in wind speed and building seas (max 50 knots with max 25-30' seas.) Since we deployed our para-anchor before conditions were too bad, the deployment was fairly straightforward. We chose to attach the shackle of the rode directly to our 60# plow anchor's welded cross-bar (v). After seizing the shackles we let out the 400' rode, anchor and 100' of 5/16" chain over the stainless steel bow roller. The weight of the anchor and chain provided an excellent catenary to absorb the shocks we experienced during the worst conditions. Our biggest concern the whole time we sat on the para-anchor was the strength of the cross-bar on the plow anchor. Though it held just fine, I wonder if I should have used a different attachment point.

Windcrest performed very well while on the sea anchor. She yawed from side to side a total of 30° [total arc]. At one point the anchor chain jumped out of the stainless steel roller (we forgot to put pin through top of roller) and found its way down the starboard side and into the stainless steel chock causing only cosmetic damage. Due to the rugged nature of our chocks, we would intentionally place the chain in the chock in the future.

After 23 hours the seas subsided to 15-20' and the winds moderated to less than 25 knots and began coming from a different direction than the seas. At this point Windcrest insisted on pointing into the wind rather than the seas. This caused considerable rolling and was the ultimate reason we retrieved the para-anchor when we did. The smashing/crashing sounds below were enough to make a man go mad. The retrieval was straightforward but more difficult than the deployment. We felt it was next to impossible to retrieve the tackle in an orderly fashion. We ended up with a heaping mess of rode and para-anchor lines. However, when we repacked the gear at a later date it was not as bad as we had anticipated. In summary, I have nothing but good things to say about the para-anchor equipment and would not go offshore without one.

(CAUTION: The steel anchor should be taken off in storms lest a breaking wave smash it against the boat.)

PLOUGH

CAUTION: A big, heavy steel anchor may provide added catenary shock absorption hanging on the rode, but in a Fastnet type storm it may also get turned into a lethal object if it gets smashed against the boat by a breaking wave. It should be taken off, and the rode attached the chain itself.

Sea Anchors on Monohulls

S/M-20 Hinckley 49 Ketch

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SOUWESTS/M-20

Hinckley 49 Ketch

49' x 19 Tons, Wide Keel & Centerboard

18-Ft. Dia. Sea Anchor

Force 10+ Conditions

 

File S/M-20, obtained from delivery skipper Michael Auth, Worton, MD. - Vessel name Pilgrim, hailing port Oxford, Hinckley ketch designed by McCurdy & Rhodes, LOA 49' x LWL 43' x Beam 12' x Draft 5' 6" (9' with CB down) x 19 Tons - Wide keel & auxiliary centerboard - Sea anchor: 18-ft. diameter Para-Tech on 300' x 3/4" nylon three strand with 5/8" stainless steel swivel - Deployed in deep water about 95 miles east of Cape Hatteras (in Gulf Stream) in hurricane Gordon with winds of 50-60 knots and seas of 35 feet - Vessel's bow yawed 10°.

 

Pilgrim was caught in the web of hurricane Gordon in November 1994. With options exhausted, an 18-ft. diameter Para-Tech sea anchor was deployed - on the fly! It pulled the bow of the yacht right up into the seas (only 10° of yaw) and kept it there for fifteen minutes. However the sea anchor rig was lost shortly thereafter. With conditions worsening Pilgrim had to be abandoned, the crew being taken off by the Coast Guard. Transcript:

Possibly you have read or seen national news coverage including video footage of a dramatic Coast Guard helicopter sea rescue off the Virginia coast this past fall. Actually there were two sailing vessels that got caught in hurricane Gordon and fortunately all the crew from both vessels were successfully rescued by the Coast Guard. I was skipper on the vessel Pilgrim, a 1974, 49' Hinckley ketch sailing from St. Georges, Bermuda to Chesapeake Bay. The boat was in above average condition and had recently undergone extensive upgrading. I have accumulated approximately 70,000 sea miles delivering both power and sail vessels and as customary went through my usual pre-delivery checklist which included inspecting emergency gear.

Pilgrim was equipped with a new 18' PARA-TECH sea anchor and all crew familiarized themselves with proper deployment procedures although we never really though we would have to use this gear. Typical! I thought I had a good "weather window" to make the 600 mile crossing. I not only had the Bermuda weather service's latest information, but had also retained the services of a private meteorologist - Bob Rice's Weather Window, Inc. All weather forecasts indicated Tropical Storm Gordon would track into the Gulf of Mexico and most probably weaken and pose no threat to us.

We departed Bermuda on Nov.14 and made good progress towards the Chesapeake. On Thursday Nov. 17, only 110 nm from the Bay but still in the Gulf Stream, we got hit by what was once a Tropical Storm, now declared Hurricane Gordon! Pilgrim experienced serious problems and equipment failures in Force-10 conditions, which ultimately resulted in our decision to place a Mayday call and activate our EPIRB. Just prior to this we had deployed our PARA-TECH sea anchor. This was not an easy task as we were running downwind in 30-40' heavy breaking confused seas with sustained winds of 50 kts and greater. We managed to secure the tether of the sea anchor to our bow anchor, connected to chain and nylon rode. Once the sea anchor was thrown overboard, rode went out of the chain locker in a wild, uncontrolled, extremely fast and dangerous manner.

The 18' diameter sea anchor worked excellent holding the bow of Pilgrim into the wind and seas and allowing the crew to attempt emergency repairs under much more controlled conditions. We felt fortunate to have the PARA-TECH sea anchor and believed this would give us the opportunity to control the boat which we didn't have previously. However, about fifteen minutes after we deployed the sea anchor we noticed that the rode connecting it to Pilgrim was gone! Somehow, we'll never know exactly, the entire rode was gone from the chain locker! Conditions were so bad below we couldn't examine the chain locker to determine the cause of the problem but might speculate that: 1) The force acting on the rode, including the shock loads, (which were great) might have been too great and pulled the bitter end free. 2) Possibly the bitter end, however it was secured, had parted in some manner. 3) Possibly as some owners will do, tie a large knot in the bitter end so it won't pass through the deck opening, this could have pulled through the deck opening. 4) Also, some owners will secure a piece of wood at the bitter end to prevent the rode from running free. If this was the case, it could have broken and allowed the rode to run out. 5) Another theory, if the rode had been secured to an eye bolt or other securing device, it could have broken or pulled out too. Bottom line is that we did in fact loose our sea anchor which was doing it's job of helping to control the vessel. Consequently when we lost this gear we lost control and eventually had to abandon Pilgrim!

Some suggestions I might offer to possibly avoid this type of situation would be: 1) Place a WARNING notice in an obvious location telling the user to check that the bitter end of the anchor rode is securely attached to a permanent strong piece of equipment that can take a strong shock load or force.... 2) Possibly design a better or easier way of connecting the sea anchor tether to the anchor and/or anchor chain.... The crew on Pilgrim had a most difficult time trying to secure the sea anchor tether under extreme conditions (the usual conditions when you need to deploy this gear). Maybe a heavy duty snap shackle would work? When you're on the bow and it is rising and falling 30 feet or more, it is a most dangerous and difficult task to say the least!

Sea Anchors on Monohulls

S/M-19 Aloha 30 Sloop

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ALOHAS/M-19

Aloha 30 Sloop

30' x 3.5 Tons, Fin Keel

9-Ft. Dia. Sea Anchor

Force 8-9 Conditions

 

File S/M-19, obtained from Richard Brooker, Winnipeg, Canada - Vessel name Crocodile Rock, hailing port Winnipeg, Aloha 30 sloop designed by Ron Holland, LOA 30' x LWL 26' x Beam 10' x Draft 6' x 3.5 Tons - Fin keel - Sea anchor: 9-ft. diameter Para-Tech on 400' x 1/2" nylon three strand with 3/8" swivel - Deployed in shallow water (50 fathoms) about 30 miles off the Oregon coast, NW of the mouth of the Columbia River, in a low system with winds of 40-45 knots and seas of 10 feet - Vessel's bow yawed 20° - Drift was 4 n.m. during 18 hours at sea anchor.

No written feedback accompanied the completed DDDB form. In answering the question, "How many degrees did this vessel yaw from side to side?" the owner has checked the "20°" box and written the words "very stable" next to it.

Sea Anchors on Monohulls

S/M-18 Crealock 34 Cutter

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CREALOCKS/M-18

Crealock 34 Cutter

34' x 6.75 Tons, Low Aspect Fin/Skeg

15-Ft. Dia. Sea Anchor

Force 8-9 Conditions

 

File S/M-18, obtained from John R.S.Charlton, Oceanside, CA. - Vessel name Fancy Free II, hailing port Oceanside, Pacific Seacraft cutter designed by Bill Crealock, LOA 34' 1" x LWL 26' 2" x Beam 10' x Draft 4' 11" x 6.75 Tons - Low aspect fin keel and skeg rudder - Sea anchor: 15-ft. diameter Para-Tech on 300' x 1" nylon three strand with 1/2" stainless steel swivel - Deployed in deep water about 550 n.miles NE of Hawaii in a whole gale with winds of 40-50 knots and seas of 30 feet - Vessel's bow yawed 10° - Drift was reported to be "minimal" during 12 hours at sea anchor.

Fancy Free II was en route to Kaneohe, Hawaii from Oceanside, California in the month of January. She ran into a south-westerly gale and had to use her 15-ft. diameter Para-Tech sea anchor. Owner's handwritten remark reads thus:

Great product. Unfortunately, my helm was not lashed down securely - steering cable broke at quadrant. (Large wave lifted stern and rudder slammed over to "stops").

Fancy Free II is a sister ship to N'ISKU (see illustration in previous file). Both of these Crealocks behaved very well at sea anchor, yawing less than 10°. Note that N'ISKU used 400' x 1/2" nylon plus 50' of chain, while Fancy Free II used 300' of 1-inch nylon, and yet both boats behaved equally well. In looking for causality one has to put on a Sherlock Holmes hat and try to find some basic virtue in Bill Crealock's design, something that makes these boats yaw so little - probably the closeness of the CLR to the CE - while not losing sight of other variables such as the rode length that determines the relative positions of the boat and sea anchor.

Sea Anchors on Monohulls

S/M-17 Crealock 34 Cutter

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CREALOCKS/M-17

Crealock 34 Cutter

34' x 6.75 Tons, Low Aspect Fin/Skeg

12-Ft. Dia. Sea Anchor

Force 8-9 Conditions

 

File S/M-17, obtained from Sandy and Les Bailey, Honolulu, HI. - Vessel name N'ISKU, hailing port Honolulu, Pacific Seacraft cutter designed by Bill Crealock, LOA 34' 1" x LWL 26' 2" x Beam 10' x Draft 4' 11" x 6.75 Tons - Low aspect fin keel and skeg rudder - Sea anchor: 12-ft. diameter Para-Tech on 400' x 1/2" nylon three strand with 50' of chain and 3/8" swivel - Deployed in deep water near 15° 49' N, 159° 48' W, in a gale with winds of 40-45 knots and seas of 16 feet - Vessel's bow yawed 10° - Drift was 15 miles during 14 hours at sea anchor.

 

N'ISKU was en route to Palmyra Atoll from Honolulu, when she ran into something akin to a Kona storm. A 12-ft. diameter Para-Tech sea anchor was then deployed, which held the bow of the yacht into the seas in a most satisfactory way. Transcript:

This was not a survival situation in the usual sense. On this passage, my wife and I had endured four successive days of 25+ knot easterly trade winds, all from ahead of the beam, with 12 to 14 foot seas from the same direction. The boat handled beautifully and we never felt threatened nor out of control, logging 150 to 160 miles per day. Unfortunately, persistent mal de mer had flattened my wife from the first day and then a streptococcal throat infection laid me low. These tribulations significantly reduced the pleasure of the sail and severely taxed our stamina. Nevertheless, we maintained our watches and did not feel it was unsafe to continue as long as conditions remained the same - which they didn't.

The wind piped up to 40 knots with higher gusts and veered a bit to the south. The seas built and became confused. The motion became most uncomfortable with a yaw component that made it very difficult for a couple of arthritic sexagenarians to get around. We then decided it was time for a little "rest and rehabilitation." We tried heaving-to under sail, but this did not prove satisfactory under those conditions. Over the side went the sea anchor and immediately our habitat became more livable. The major motion of the boat was now an almost gentle pitch, with occasional episodes of roll, but amazingly the uncomfortable yaw motion had vanished.

We used a 12 foot Para-Tech nylon parachute specifically designed as a sea anchor in a deployable storage bag. A large fender (8" x 24") served as the primary float and a smaller dinghy fender (3" x 12") at the end of 100 feet of 1/4" polypropylene was the trip line. Our rode consisted of 200 feet of three strand 1/2" nylon, 50 feet of 5/16" BBB chain and a second 200 feet of 1/2" nylon for a total of 450 feet. Swivels were used to attach the nylon rode to the anchor and to the chain (overkill perhaps). The nylon rode was led through a bow roller to cleats. Sufficient rode was released so that the bright yellow canopy of the sea anchor was visible in the crest of an oncoming swell as we were atop the crest of another wave. Three to four layers of fire hose were used for chafe protection at the roller.

We did not observe surge or shock loads on the rode. The boat always seemed to head into the wind and seas at the same angle (<10°) and did not sail about at anchor. The entire system worked perfectly, probably because of a) the length of the rode, b) the catenary induced by the chain in the middle of the rode, and c) the boat and anchor were in crests and troughs in synchrony. By morning the winds had abated to about 30 knots and backed into the east. The crew, still bruised, but very much refreshed by a night of rest, was eager to head south again.

Sea Anchors on Monohulls

S/M-16 Cape George 31 Cutter

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CGEORGES/M-16

Cape George 31 Cutter

31' x 9 Tons, Full Keel

12-Ft. Dia. Sea Anchor

Force 8 Conditions

 

File S/M-16, obtained from Steve Lockwood, Portland, OR. - Vessel name Halo, hailing port Portland, Cape George cutter designed by Nolan Atkins, LOA 31' x LWL 27' 6" x Beam 9' 6" x Draft 5' x 9 Tons - Full keel - Sea anchor: 12-ft. diameter Para-Tech on 300' x 1/2" nylon 3-strand and 50' of 5/16" chain, with 1/2" stainless steel swivel - Deployed in deep water about 100 miles northwest of San Francisco in a gale with winds of 35-40 knots and seas of 14 feet - Vessel's bow yawed up to 90° at times - Drift was about 6 miles during 20 hours at sea anchor.

In May 1993 Halo was en route to the Bay Area from Portland, normally a downwind run. When she ran into a southerly gale her owner tried beating into it for a while, and then decided to deploy a 12-ft. diameter Para-Tech sea anchor. Halo was sea anchored for 20 hours, drifting only 6 miles. Transcript:

Boat was held off the wind an increasing amount as wind strength increased. Very uncomfortable roll and some waves broke on deck. Our boat is exceptionally strong so we were not very concerned. We forgot to add a swivel, but noticed no difference in boat motion over time. There was some twisting [of the nylon rode], but not severe at all. Rode was 300' x 1/2" nylon with 50' of 5/16" chain at sea anchor. Certainly no survival storm, but we thought it would be interesting to try it out and that a break from beating into the gale would be nice if we didn't lose too much ground.

Sea Anchors on Monohulls

S/M-15 Whitby 42 Ketch

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WHITBYS/M-15

Whitby 42 Ketch

42' x 11.75 Tons, Full Keel & Cutaway Forefoot

12-Ft. Dia. Sea Anchor

Force 8 Conditions

 

File S/M-15, obtained from Bruce Stewart, Ithaca, NY. - Vessel name Osteoflyte, hailing port Ithaca, Whitby ketch designed by Ted Brewer, LOA 42' x LWL 33' x Beam 13' x Draft 5' x 11.75 Tons - Full keel & cutaway forefoot - Sea anchor: 12-ft. diameter Para-Tech on 300' x 3/4" nylon three strand with 5/8" galvanized swivel - Deployed in deep water 150 miles east of Cape Hatteras in a low system with winds of 35 knots and seas of 20 feet - Vessel's bow yawed 45° - Drift was about 2.5 miles during 20 hours at sea anchor.

Ordinarily the ketch rig places the CE (center of wind effort) a great deal more forward than sloop, cutter, or yawl rigs. Unless a mizzen can be flown most ketches will tend to "hunt" at anchor. Transcript:

We were 150 miles off Cape Hatteras in 20' seas and deteriorating weather, when we fouled our prop reducing sail. We needed a break so I decided to deploy the chute (this was the first time other than a fair weather practice). We sent the unit off the stern [flying set] on a new 3/4" three strand nylon rode and it went out so fast I got a rope burn I'll never forget. The bow swung as expected and the rode went out a smooth bow skene chock with a good fairlead.

We hung on the chute for 20 hours. The conditions were NASTY, but we could still get to the bow and fuss with the rode. We had a terrible problem with chafe. We tried "freshening the nip" and all sorts of commercial and fabricated chafe gear - it either split or migrated very quickly. In those conditions I think we would have lost the chute to chafe failure of the rode. The second problem was the bow "hunted" back and forth, giving us a most unpleasant motion, and may well have contributed to the chafe. Both of these problems make me question - would a bridle that held the bow a little off center help? And how do you deal with chafe when conditions are really bad?

A few comments. Despite my para-anchor being clearly undersized by your current brochure it held us like a brick wall and seems quite large enough. In 20 hours we drifted 2.5 miles by Loran. I didn't have a suitable trip line and was afraid of a tangle, so just used a float. When the wind dropped to 20-25 we decided to "pull in" the chute and get going. It took two of us (both 220 lbs. and in good shape) to pull us up to the para-anchor and 90 minutes of cranking the anchor windless and then tailing to the genoa winches.

Sea Anchors on Monohulls

S/M-14 Carol Sloop

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DEANNAS/M-14

Carol Sloop

24' 6" x 2.7 Tons, Full Keel

9-Ft. Dia. BUORD Sea Anchor

Force 6-7 Conditions

 

File S/M-14, obtained from Walter Keintzel, Monterey, CA. - Vessel name Deanna, hailing port Monterey, "Carol" double-ender designed by Chuck Paine, LOA 24' 6" x LWL 20' x Beam 9' x Draft 3' 6" x 2.7 Tons - Full keel - Sea anchor: 9-ft. diameter BUORD on 300' x 1/2" nylon three strand with 1/2" galvanized swivel - Deployed in deep water off the central coast of California in low system with winds of 30 knots and seas of 10 feet - Vessel's bow yawed up to 80° - Drift was about 7 miles during 11 hours at sea anchor.

Victor Shane had the opportunity to take a close look at Deanna when she was moored in Santa Barbara harbor. This little pocket cruiser has a flush deck, with very low freeboard and a large full keel beneath. When Deanna is lying a-hull she is more or less anchored to the surface of the ocean by virtue of her big keel alone. Her rate of drift is further reduced because of her low freeboard. In general a yacht has to drift, to tug at a sea anchor, to cause it to fully inflate and function properly. In 60-knots of wind the same BUORD would have done a better job on this boat. A much larger parachute, say a 24-ft. diameter military chest reserve, would likely have pulled Deanna's bow up much higher into the wind as well, even in the given 30 knots. Here is a transcript of the feedback obtained from Walter Keintzel:

Location was 55 miles true west of Pt. Sal, measured by the Loran. I don't recall the barometer reading, but it was "normal." Don't recall the wave length & period, because when I deployed the sea anchor at 20:00 hrs. I was very, very exhausted & numb.

We lay at 80° to the nylon rode - almost parallel to the seas. I think this is because my flush-decked boat got lost in the troughs - not enough windage! With a riding sail on the back stay, I think it would work. As it was, it wasn't too bad.

Mainly the anchor kept me in place for a stormy night, and kept my physical condition from deteriorating to the point where I needed to call the Coast Guard. Next day I ran into Morro Bay for rest & repairs.

I'm very grateful for the parachute anchor. It was easy to deploy, but next time I'll certainly use a 300' trip line. Retrieval was like pulling a VW for fifty minutes!