iangrant
Well-Known Member
Re: Parachute anchor depl;oyment theory?
Tee Hee...
Anyway, HOW MANY nylon cones over 100? Blimey
Ian
Tee Hee...
Anyway, HOW MANY nylon cones over 100? Blimey
Ian
Drogue or Parachute anchor?
- Thread starter iangrant
- Start date
Sea Devil
Well-Known Member
Re: Parachute anchor depl;oyment theory?
...........It was explained to me that if a big blow is expected then the para anchor can be made ready in advance by attaching the bridle to the forward cleats, run the line along the rails attached with cable ties and prepare for the "launch" from the cockpit.
Sounds easy don't it?
I think as Pepermint has suggested Asterie will lie ahull anyway and if that doesn't work as a last resort I'd try the drogue out the back...............
Actually it is pretty easy to set the parachute sea anchor up in quite demanding conditions - the only hard bit is the shackle onto the anchor - the thing is designed to launch from the cockpit and recover from the cockpit.
The problem I have found laying a hull is that she tends to put some beam to-wards the sea and the waves can sound like sledge hammers and there is some danger in being pushed sideways... That really is where the parachute is so good. Holds the bows to the waves and slows the boat down - right down without inflicting unfair pressure on the rudder. - the boat sits comfortably in quite extreme conditions....I would have considerable reservations about towing much more than warps because of the strain put on the rudder by the boat effectively going astern..
If you are on a lee shore the drift rate under a suitable parachute sea anchor is about 1 to 1 1/2 knots... becomes a matter of estimating the length of the blow against sea room. These sort of anchors are really for ocean passaging I think.
...........It was explained to me that if a big blow is expected then the para anchor can be made ready in advance by attaching the bridle to the forward cleats, run the line along the rails attached with cable ties and prepare for the "launch" from the cockpit.
Sounds easy don't it?
I think as Pepermint has suggested Asterie will lie ahull anyway and if that doesn't work as a last resort I'd try the drogue out the back...............
Actually it is pretty easy to set the parachute sea anchor up in quite demanding conditions - the only hard bit is the shackle onto the anchor - the thing is designed to launch from the cockpit and recover from the cockpit.
The problem I have found laying a hull is that she tends to put some beam to-wards the sea and the waves can sound like sledge hammers and there is some danger in being pushed sideways... That really is where the parachute is so good. Holds the bows to the waves and slows the boat down - right down without inflicting unfair pressure on the rudder. - the boat sits comfortably in quite extreme conditions....I would have considerable reservations about towing much more than warps because of the strain put on the rudder by the boat effectively going astern..
If you are on a lee shore the drift rate under a suitable parachute sea anchor is about 1 to 1 1/2 knots... becomes a matter of estimating the length of the blow against sea room. These sort of anchors are really for ocean passaging I think.
BlueSkyNick
Well-Known Member
Re: Parachute anchor depl;oyment theory?
Thanks Mate, very interesting and useful information (bit pricey though)
Better luck next weekend.
Thanks Mate, very interesting and useful information (bit pricey though)
Better luck next weekend.
webcraft
Well-Known Member
Re: Lying ahull
[ QUOTE ]
The problem I have found laying a hull is that she tends to put some beam to-wards the sea and the waves can sound like sledge hammers and there is some danger in being pushed sideways...
[/ QUOTE ] Although this used to be the traditional response, lying ahull in severe weather with breaking seas is a recipe for a knockdown and not generally recommended nowadays. Better to heave to under trysail and storm jib so you are not presenting your beam to the sea, is it not?
- Nick
[ QUOTE ]
The problem I have found laying a hull is that she tends to put some beam to-wards the sea and the waves can sound like sledge hammers and there is some danger in being pushed sideways...
[/ QUOTE ] Although this used to be the traditional response, lying ahull in severe weather with breaking seas is a recipe for a knockdown and not generally recommended nowadays. Better to heave to under trysail and storm jib so you are not presenting your beam to the sea, is it not?
- Nick
Sea Devil
Well-Known Member
Re: Lying ahull
..................Although this used to be the traditional response, lying ahull in severe weather with breaking seas is a recipe for a knockdown and not generally recommended nowadays. Better to heave to under trysail and storm jib so you are not presenting your beam to the sea, is it not?.....................
..................................................................................................................
But this is why you get to the sea anchor bit. Having got the sail area reduced to a minimum, which also creates the problem of no wind in the bottom of the swells and going too fast at the top, you can launch the sea anchor which will hold you head to sea - going very slowly astern - close the hatch and make coffee...
..................Although this used to be the traditional response, lying ahull in severe weather with breaking seas is a recipe for a knockdown and not generally recommended nowadays. Better to heave to under trysail and storm jib so you are not presenting your beam to the sea, is it not?.....................
..................................................................................................................
But this is why you get to the sea anchor bit. Having got the sail area reduced to a minimum, which also creates the problem of no wind in the bottom of the swells and going too fast at the top, you can launch the sea anchor which will hold you head to sea - going very slowly astern - close the hatch and make coffee...
webcraft
Well-Known Member
Re: Lying ahull
Sorry Michael, I misunderstood you.
The normal definition of 'lying ahull' is battening down the hatches and leaving the boat to her own devices with no sail up or drag device deployed - in which condition most vessels will lie beam-on to the seas.
You obviously meant lying to a sea anchor with the bows into the weather.
- Nick
Sorry Michael, I misunderstood you.
The normal definition of 'lying ahull' is battening down the hatches and leaving the boat to her own devices with no sail up or drag device deployed - in which condition most vessels will lie beam-on to the seas.
You obviously meant lying to a sea anchor with the bows into the weather.
- Nick
Sea Devil
Well-Known Member
Re: Lying ahull
When it gets windy and rough - offshore - I just go through the less and less sail process. Towards the end of that get the sea anchor laid out - ready... With my steel boat I used to lay a hull - as you describe - worked fine except for the sledge hammers etc.. With plastic boats it feels more dodgy. Really do not want to run off before the wind without sails for the fatigue reason if nothing else - the self steering stops working in the troughs and she looses direction - so you have to be active on the helm. By that time you are tired anyway and I prefer to go below and sit it out. In fact I think most boats will take care of themselves anyway but the comfort element and giving them a helping hand is probably the next move in those situations...
Personally I suspect the parachute sea anchor from the bows is probably the answer if lightly crewed or single handing -
When it gets windy and rough - offshore - I just go through the less and less sail process. Towards the end of that get the sea anchor laid out - ready... With my steel boat I used to lay a hull - as you describe - worked fine except for the sledge hammers etc.. With plastic boats it feels more dodgy. Really do not want to run off before the wind without sails for the fatigue reason if nothing else - the self steering stops working in the troughs and she looses direction - so you have to be active on the helm. By that time you are tired anyway and I prefer to go below and sit it out. In fact I think most boats will take care of themselves anyway but the comfort element and giving them a helping hand is probably the next move in those situations...
Personally I suspect the parachute sea anchor from the bows is probably the answer if lightly crewed or single handing -
ChrisE
Well-Known Member
Re: We should try talking to the RNLI
You are right about getting an appropriate length of warp.
We used to tow a water turbine to generate electricity on a 50m warp which was fine until we found ourselves going downwind in 30 knots in a bit of a sea. The turbine came up in the water and skipped a bit then kapow it leapt out of the water, the warp went slack and twisled up making the warp now 30m. Next time the turbine came out of the water it shot forward and 25lbs of spinning metal bounced off the transom about 6 inches below hitting my better half who was steering at the time. After that we towed the thing on 100m of warp and never had the problem even in higher winds.
You are right about getting an appropriate length of warp.
We used to tow a water turbine to generate electricity on a 50m warp which was fine until we found ourselves going downwind in 30 knots in a bit of a sea. The turbine came up in the water and skipped a bit then kapow it leapt out of the water, the warp went slack and twisled up making the warp now 30m. Next time the turbine came out of the water it shot forward and 25lbs of spinning metal bounced off the transom about 6 inches below hitting my better half who was steering at the time. After that we towed the thing on 100m of warp and never had the problem even in higher winds.